Rafting on Snake River Lake Marie, Snowy Mountains Wyoming Wind River Range picture

TECHNICAL MEMORANDUM


Subject:Wind/Bighorn River Basin Plan
Task 3A/3B . Surface Water Hydrology
Date:October 2002 (Revised March 2003)
Prepared By:MWH Americas, Inc.

This Technical Memorandum reviews original data and methodologies used to develop surface water input data for the Wind/Bighorn River Basin Planning Model. The document fulfills the reporting requirements of Task 3A and a portion of Task 3B from the contract. The portion of the scope not included in this Technical Memorandum will be covered in later Technical Memoranda.

This technical memorandum contains the following sections. Within each section are tables and figures containing the data for each of the main study area basins.

Section

Section 1 - Introduction
Section 2 - Historical Streamflow Records
Section 3 - Study Period Selection
Section 4 - Data Filling and Extension
Section 5 - Ungaged Headwaters Site Data Estimation
Section 6 - Hydrologic Year Classification
Section 7 - Summary Flow Data
Section 8 - References

Appendix A . Streamflow Gage Data Record Extension
Appendix B . Study Period Monthly Streamflow
Appendix C . Hydrologic Classification Monthly Streamflow

Section 1 - Introduction

To be consistent with previous basin plans, the Wind-Bighorn Basin will be modeled using the same methodologies as used in the feasibility studies for the Bear River Basin and the Green River basin. The Guidelines for Development of Basin Plans (WWDC, 2001) recommended that for the purposes of the river basin plans, the hydrologic analysis be conducted for three 12-month periods using average dry-year conditions, average average-year conditions and average wet-year conditions. Therefore, each hydrologic region in the model will have three associated spreadsheet models representing those three hydrologic conditions. The gaged flows used in the spreadsheet model are developed by averaging recorded monthly streamflows for groups of years falling into those three hydrologic categories during a consistent period-of-record.

A map of the Wind/Bighorn River Basin Plan study area is shown in Figure 1-1. The study area includes those Missouri River basins located in northwestern Wyoming, including those portions of the Madison River Basin, Gallatin River Basin, Yellowstone River Basin and Wind/Bighorn River Basin located within the State of Wyoming. Table 1-1 shows the USGS Hydrologic Unit classifications which are included in the planing area. All of the river basins are tributary to the Yellowstone River in southern Montana, which is subsequently tributary to the Missouri River in northeastern Montana.

Table 1-1. USGS Hydrologic Units and Associated Models Included in Study Area
Hydrologic
Unit Code
Hydrologic Unit NameSub-Region Name(1)Area
(acres)
Study BasinStudy Sub-Basin
10020007MadisonMissouri Headwaters1,638,991Madison/GallatinMadison/Gallatin
10020008GallatinMissouri Headwaters1,162,356Madison/GallatinMadison/Gallatin
10070001Yellowstone HeadwatersUpper Yellowstone1,654,127YellowstoneYellowstone
10070002Upper YellowstoneUpper Yellowstone1,897,992YellowstoneYellowstone
10070006Clarks Fork YellowstoneUpper Yellowstone1,784,937Clarks ForkClarks Fork
10080001Upper WindBig Horn1,628,472WindUpper Wind
10080002Little WindBig Horn708,641WindLittle Wind
10080003Popo AgieBig Horn511,611WindNot Included(2)
10080004MuskratBig Horn466,187WindLower Wind
10080005Lower WindBig Horn1,084,233WindLower Wind
10080006BadwaterBig Horn538,167WindBadwater
10080007Upper BighornBig Horn2,217,263Big HornUpper Big Horn
10080008NowoodBig Horn1,282,397Big HornNowood
10080009GreybullBig Horn733,218Big HornGreybull
10080010Big Horn LakeBig Horn1,150,802Big HornBig Horn Lake
10080011DryBig Horn281,821Big HornBig Horn Lake/Greybull
10080012North Fork ShoshoneBig Horn545,062Big HornShoshone
10080013South Fork ShoshoneBig Horn417,701Big HornShoshone
10080014ShoshoneBig Horn954,605Big HornShoshone

Notes:
(1)All Sub-Regions contained in the Missouri River Region.
(2)The Popo Agie River basin is modeled in the Popo Agie River Watershed study. This model contains an inflow node for the Popo Agie River that incorporates these results.

For purposes of the discussion herein, the Study Area has been divided into five basins: the Madison/Gallatin River Basin, the Yellowstone River Basin, the Wind River Basin and the Bighorn River Basin. The Madison River and Gallatin River are not hydrologically connected. However, they have been grouped together because the models will be very small. The Wind and Bighorn Rivers are actually the same river, changing names at the .Wedding of the Water. near Thermopolis. The river is called the Wind River south of the Owl Creek mountains while it is called the Bighorn River north of the Owl Creek mountains. The river has been separated because of the clear basin distinctions that occur through the Owl Creek mountains. There are no hydrologic connections, other than the river itself, across the mountain chain.

Figure 1-1. Study Area Map

Section 2 - Historical Streamflow Records

The basin spreadsheet models utilize historical data to simulate river operations on a monthly basins during average dry, average and wet years. Therefore, data collection and reduction to useable formats within the model is the first task in the modeling effort.

Streamflow data is available for hundreds of locations throughout the study area for various periods-of-record. Streamflow gages are primarily operated and maintained by the USGS, while the SEO has historically operated miscellaneous gages in the basin for brief periods to assist in water delivery and accounting. USGS data is available from both the Wyoming Water Resources Data System (WRDS) and the USGS National Water Information System (NWIS) on the Internet (USGS, 2002). USGS data used in this model was researched using WRDS, then downloaded from the Internet to facilitate incorporation into existing data reduction spreadsheets.

Separate spreadsheets for each hydrologic unit were developed to store streamflow data. Typically, the base reporting level for the USGS is average daily streamflow in cubic feet per second (cfs). Therefore, in order to have available the most detailed records in the database, the average daily streamflow was downloaded from the Internet and stored in the spreadsheet. Then, the spreadsheet was used to reduce daily data into total monthly flow and total annual flow in acre-feet for each month and year that data was available.

Locations of river basins, major waterways, gages and approximate irrigated lands are shown in the figures within this section. It should be noted that the irrigated lands shown in these maps are from preliminary irrigated lands delineations and are intended only to show the locations of streamflow gages in relationship to irrigated lands. Final irrigated lands delineations within the study area are available in the GIS coverages developed as part of the Wind/Bighorn River Basin Plan.

2.1 Madison/Gallatin River Basins

The streamflow gages located within and immediately downstream of the study area for the Madison River and Gallatin River basins are shown in Figure 2-1 and Table 2-1. There is a streamflow gage on both the Firehole River and Gibbon River within Wyoming upstream of their confluence. In addition, there is a gage on the Madison River just downstream of the Wyoming/Montana state line. The Firehole and Gibbon River gages ceased operations in 1996 while the Madison River gage is still operational. There are no streamflow gages on the Gallatin River within Wyoming. The closest gage to the state line is located approximately 10 miles downstream of the state line near the Gallatin Gateway. The gage is currently operational. However, there are small gaps in the record that required filling.

Figure 2-1. Madison and Gallatin River Basins

Table 2-1. Madison and Gallatin River Basin Streamflow Gages
BasinGage
Number
Gage IDGage Name Drainage
Area
(sq. mi.)
Period of Record
Madison/
Gallatin
06036905FireholeFirehole River near West Yellowstone, MT282Oct 1983 - Mar 1996
06037000GibbonGibbon River near West Yellowstone, MT118Jun 1913 - Mar 1996(1)
06037500Mad_WstYMadison River near West Yellowstone, MT420Jul 1913 - Sep 2001(1)
06043500Gal_GalGt2Gallatin River near Gallatin Gateway, MT825Aug 1889 - Sep 2001(1)

Notes:
(1)Incomplete data within period-of-record.

2.2 Yellowstone River Basin

The streamflow gages located within the hydrologic unit are shown in Figure 2-2 and Table 2-2. The Yellowstone River at Corwin Springs (06191500) is located in Montana, but was included in this analysis for two reasons: (1) it contains an uninterrupted long-term period-of-record which is extremely useful in data analysis and data extension, and (2) it is located just downstream of the confluence of the Gardner River confluence, which provides a convenient terminus for the model. Four of the gages are currently operational.

Table 2-2. Yellowstone River Basin Streamflow Gages
BasinGage
Number
Gage IDGage Name Drainage
Area
(sq. mi.)
Period of Record
Yellowstone06186500Yl_LkOutYellowstone River at Yellowstone Lake Outlet, YNP1,006Oct 1926 - Sep 2001(1)
06187000Yl_CnHotYellowstone River near Canyon Hotel, YNP1,157Jun 1913 - Sep 1951(1)
06187500Tow_TowFTower Creek at Tower Falls, YNP50Sep 1922 - Sep 1943(1)
06187915Sod_SlvSoda Butte Creek at Park Boundary at Silver Gate50Oct 1999 - Sep 2001
06187950Sod_LRSSoda Butte Creek near Lamar Ranger Station, YNP99Oct 1988 - Sep 2001
06188000Lam_TRSLamar River near Tower Falls Ranger Station, YNP660May 1923 . Sep 2001(1)
06188500EFBl_MamEast Fork Blacktail Deer Creek near Mammoth, YNP10Nov 1937 - Sep 1941
06189000BlD_MamBlacktail Deer Creek near Mammoth, YNP15Nov 1937 - Sep 1993(1)
06190000Lup_MamLupine Creek near Mammoth, YNP5Nov 1937 - Sep 1941
06190500Gard_MamGardner River at Mammoth, YNP200Sep 1922 - Oct 1938(1)
06190540Gard_nrMamHot River at Mammoth, YNP(2)Oct 1988 - Sep 1995
06191000Hot_MamGardner River near Mammoth, YNP202Oct 1938 - Sep 2001(1)
06191500Yl_CSpYellowstone River at Corwin Springs, MT2,623May 1897 - Sep 2001(1)

Notes:
(1)Incomplete data within period-of-record.

Figure 2-2. Yellowstone River Basin

2.3 Clarks Fork River Basin

A list of streamflow gages in the Clarks Fork Hydrologic Unit is shown in Figure 2-3 and Table 2-3. Gages are located on the Clarks Fork upstream of irrigation diversions within Wyoming and immediately downstream of the Wyoming/Montana State Line. In addition, Big Sand Coulee, which is the only major tributary that crosses the state line within the basin, also has gages upstream of the major diversions and downstream of the state line, just upstream of its confluence with the Clarks Fork. As shown, the Clarks Fork Yellowstone River near Belfry, Montana gage (06207500) has an extensive period-of-record. This gage is located just upstream of the confluence of the Clarks Fork and Big Sand Coulee. However, all other gages required extensive filling to be used in the model.

Table 2-3. Clarks Fork River Basin Streamflow Gages
BasinGage
Number
Gage IDGage Name Drainage
Area
(sq. mi.)
Period of Record
Clarks Fork06205500CFk_abSqCClarks Fork Yellowstone River above Squaw Crk near Painter, WY194Oct 1945 - Sep 1951
06205950Ldg_PntLodgepole Creek at Mouth, near Painter, WY(2)Apr 1989 - Sep 1989
06206000Cfk_blCrCClarks Fork Yellowstone River below Crandall Ck near Painter, WY44Oct 1929 - Sep 1957(1)
06206500Sun_PntSunlight Creek near Painter, WY135Aug 1929 - Sep 1971(1)
06207000CFk_nrClkClarks Fork Yellowstone River near Clark, WY912Oct 1918 - Dec 1924
06207500Cfk_BlfMTClarks Fork Yellowstone River near Belfry, MT912Aug 1921 - Sep 2001
06207507BigS_nrBdgBig Sand Coulee above St Ditch near Badger Basin, WY98May 1973 - Sep 1977(1)
06207510BigS_LineBig Sand Coulee at WY-MT State Line98May 1973 - Sep 1981(1)
06207540STip_BlfMTSilver Tip Creek near Belfry t Mt98Oct 1967 - Sep 1975

Notes:
(1)Incomplete data within period-of-record.

Figure 2-3. Clarks Fork River Basin

2.4 Wind River Basin

Streamflow data for the Wind River Basin are shown in Figure 2-4, Figure 2-5, Figure 2-6, Figure 2-7 and Table 2-4. Gages are located throughout the basin on the Wind River. In addition, there are several headwaters gages located on tributaries south of the Wind River, upstream of diversions and storage for the Wind River Irrigation Project and Riverton Unit. Streamflow gages are located on most major tributaries upstream of agricultural diversions. In addition, there are streamflow gages on the lower portions of the Little Wind River that improved model calibration. It should be noted that only streamflow gages are presented in this section . there are several return flow gages operated by the USGS that could be used in the model but are not shown in the following table and figures. Most of those gages shown are heavily influenced by agricultural diversions and return flows.

Table 2-4. Wind River Basin Streamflow Gages
BasinGage
Number
Gage IDGage Name Drainage
Area
(sq. mi.)
Period of Record
Upper Wind 06218500wind_nrDubWind River near Dubois, WY232Oct 1945 - Sep 1992
06220000Wind_atDubWind River at Dubois, WY486Jan 1911 - Sep 1912
06220500EFWind_DubEast Fork Wind River near Dubois, WY427May 1950 - Sep 1997(1)
06220800Wind_RedCkWind River above Red Creek near Dubois, WY1,073Oct 1990 - Sep 2001
06221400Din_abLksDinwoody Creek above Lakes near Burris, WY88Oct 1957 - Sep 2001(1)
06221500Din_BurDinwoody Creek near Burris, WY100Jun 1918 - Sep 1958(1)
06222000Wind_BurWind River near Burris, WY1,236Oct 1950 - Sep 1953
06222500DryCk_BurDry Creek near Burris, WY54Jun 1921 - Sep 2001(1)
06222700CrowCk_TipCrow Creek near Tipperary, WY30Oct 1962 - Sep 1993
06223000MdCk_LenMeadow Creek near Lenore, WY42Apr 1922 - Sep 1923(1)
06223500WlCk_CrowWillow Creek near Crowheart, WY55Oct 1921 - Sep 2001(1)
06224000BlCk_abLkBull Lake Creek above Bull Lake, WY187Oct 1941 - Sep 2001(1)
06225000BlLk_LenBull Lake Creek near Lenore, WY213Jun 1918 - Sep 2001(1)
06225500Wind_CrowWind River near Crowheart, Wy1,891Oct 1945 - Sep 2001
06227600Wind_KinWind River near Kinnear, Wy2,194Apr 1974 - Sep 2000(1)
06228000Wind_RivWind River at Riverton, Wy2,309Apr 1912 - Sep 2001(1)
06236100wind_abBoyWind River above Boysen Reservoir near Shoshoni, WY4,390May 1990 - Sep 2001
Little Wind 06228350SFLW_abWResSf L Wind R Ab Washakie Re Nr Ft Washakie, WY90Oct 1976 - Sep 2001
06228450SFLW_blWResSouth Fork Little Wind Riv Bel Washakie Res, WY94Oct 1988 - Sep 2001
06228500LW_FtWaLittle Wind River near Fort Washakie, WY117May 1921 - Sep 1940
06228800NFLW_nrFWNorth Fork Little Wind River Nr Fort Washakie, WY(2)Oct 1988 - Sep 2001
06229000NFLW_atFWN Fk Little Wind R At Fort Washakie, WY112May 1921 - Sep 1940
06229680Sage_NorkSage Cr Ab Norkok Meadows Cr, Nr Ft Washakie, WY118Jul 1990 - Sep 1995
06229900Trout_FWTrout Creek near Fort Washakie, WY16May 1990 - Sep 2001(1)
06230190Mill_abRLMill Cr Ab Ray Lake Outlet Canal, Nr Ft Washakie16May 1990 - Sep 1996
06230500LW_nrArapLittle Wind River near Arapahoe, WY618Oct 1950 - Sep 1953
06231000LW_abArapLittle Wind River above Arapahoe, WY660Oct 1979 - Sep 1995
06234000LW_blArapLittle Wind River below Arapahoe, WY1,464Jun 1906 - Oct 1918(1)
06234500Beav_nrLndBeaver Creek near Lander, WY113Jun 1938 - Sep 1941
06235000Beav_nrArBeaver Creek near Arapahoe, WY354May 1950 - Sep 1953
06235500LW_RivLittle Wind River Near Riverton, WY1,904Jun 1941 - Sep 2001
Lower Wind 06239000Musc_ShoMuscrat Creek near Shoshoni, WY733Jul 1950 - Sep 1973(1)
062445005mi_aPavFivemile Creek above WY Ca near Pavillion, WY118Oct 1949 - Sep 2001(1)
062450005mi_PavFivemile Creek near Pavillion, WY118Sep 1948 - Sep 1949
062500005mi_RivFivemile Creek near Riverton, WY356Oct 1949 - Sep 1965S(1)
06251500Sand_ShoSand Gulch near Shoshoni, WY19Sep 1948 - Sep 1953(1)
062530005mi_ShoFivemile Creek near Shoshoni, WY418Jun 1941 - Sep 2001(1)
06255500Poi_ShoPoison Creek near Shoshoni, WY500Oct 1952 - Dec 1953(1)
06257500Mud_PavMuddy Creek near Pavillion, WY267Apr 1949 - Sep 1973(1)
06258000Mud_ShoMuddy Creek near Shoshoni, WY332Mar 1949 - Sep 1983(1)
06258500DCot_BonDry Cottonwood Creek near Bonneville, WY165Oct 1949 - Sep 1953
06259000Wind_blByWind River below Boysen Reservoir, WY7,701Jun 1951 - Sep 2001
Badwater 06256000Bad_LybBadwater Creek at Lybyer Ranch, near Lost Cabin, WY131Oct 1948 - Sep 1968
06256500Bad_LCBadwater Creek at Lost Cabin, WY166Sep 1945 - Sep 1948
06256650Bad_LysBadwater Creek at Lysite, WY415Nov 1965 - Sep 1973
06256800Bri_LysBridger Creek near Lysite, WY182Nov 1965 - Sep 1973
06256900Dry_BonDry Creek near Bonneville, WY53Oct 1965 - Sep 1980
06257000Bad_BonBadwater Creek at Bonneville, WY808May 1947 - Sep 1973

Notes:
(1)Incomplete data within period-of-record.

Figure 2-4. Wind River Basin - Upper Wind Sub-Basin

Figure 2-5. Wind River Basin - Little Wind Sub-Basin

Figure 2-6. Wind River Basin - Lower Wind Sub-Basin

Figure 2-7. Wind River Basin - Badwater Sub-Basin

2.5 Bighorn River Basin

Streamflow gaging stations for the Bighorn River Basin are shown in Figure 2-8, Figure 2-9, Figure 2-10, Figure 2-11, Figure 2-12 and Table 2-5. Streamflow measurements have been taken on many of the mainstem river and tributaries at some point in recent history. However, many of those gages have been decommissioned and the number of currently active gages is considerable less than the total number of gages in the basin. The Shoshone River Basin, Greybull River Basin and portions of the Bighorn Lake basins have either a significant number of gages or adequate gages to develop and calibrate the model, including some headwaters gages. The Upper Bighorn tributary basins have periodic gage records that assisted in developing the model, however, model calibration was more difficult due to the large number of estimated flows that were required.

Table 2-5. Bighorn River Basin Streamflow Gages
BasinGage
Number
Gage IDGage Name Drainage
Area
(sq. mi.)
Period of Record
Upper Bighorn 06259500Bh_ThermBighorn River at Thermopolis, WY8,020Oct 1911 - Sep 1953(1)
06260000SFOwl_nrAncSouth Fork Owl Creek near Anchor, WY87Oct 1940 - Sep 1995(1)
06260200MdOwl_abAncMiddle Fork Owl Creek above Anchor Reservoir, WY34Mar 1959 - Sep 1965
06260400SFOwl_blAncSouth Fork Owl Creek below Anchor Reservoir, WY131May 1959 - Sep 2001(1)
06260500SFOwl_CrtS F Owl Creek Ab Curtis Ranch, nr Thermopolis, WY144Oct 1943 - Sep 1959
06261000SFOwl_acrnS F Owl C above C Rn near Thermopolis, WY149Oct 1938 - Sep 1943
06261500SFOwl_nrThSouth Fork Owl Creek Nr Thermopolis, WY180Aug 1921 - Apr 1932(1)
06262000NFOwl_nrAncNorth Fork Owl Creek Near Anchor, WY55May 1941 - Jul 1962(1)
06262300NFOwl_abBRNorth Fork Owl Cr ab Basin Ranch nr Anchor, WY61Apr 1962 - Sep 1995(1)
06262500NFOwl_atCRN.F. Owl Creek at Crann Ranch nr Thermopolis, WY94Jun 1938 - Sep 1939
06263000NFOwl_nrThNorth Fork Owl Creek nr Thermopolis, WY102May 1930 - Sep 1932
06263500Mud_ThMud Creek nr Thermopolis Wyo101May 1938 - Sep 1939
06264000Owl_ThOwl Creek near Thermopolis, Wy478Mar 1911 - Sep 1969(1)
06264500Owl_LucOwl Creek near Lucerne, WY509Mar 1932 - Sep 1953(1)
06265000Kirb_LucKirby Creek near Lucerne, WY199Jul 1941 - Sep 1945
06265337Cot_HamDCottonwood C at High Island Rnch nr Hamilton Dome82Apr 1993 - Sep 2001
06265500Cot_WinCottonwood Creek at Winchester, WY416Jun 1941 - Sep 1945
06265800Gos_atDkGooseberry Creek at Dickie, WY95Oct 1957 - Sep 1978
06266000Gos_GrsGooseberry Creek near Grass Creek, WY142Oct 1945 - Sep 1957
06266500Gos_nrDkGooseberry Creek near Dickie, WY289Jun 1938 - Sep 1941(1)
06267000Gos_NeiGooseberry Creek at Neiber, WY361Jun 1941 - Sep 1953(1)
06267400Now_ColtEast Fork Nowater Creek near Colter, WY149Oct 1971 - Sep 1991
0626850015mi_WorFifteen Mile Creek near Worland, WY518Mar 1951 - Sep 1986(1)
06268600Bh_WorBighorn River at Worland, WY10,810Jul 1965 - Oct 1969
06269000Bh_nrMandBighorn River near Manderson, WY11,020Apr 1949 - Sep 1956(1)
06269500Bh_atMandBighorn River at Manderson, WY11,048Oct 1941 - Sep 1949
06271500Pr_beLSolPaintrock Creek below Lake Solitude, WY16Sep 1946 - Sep 1953(1)
06274300Bh_BasBighorn River at Basin, WY13,223Oct 1983 - Sep 2001
Nowood 06270000Now_TenNowood River near Tensleep, WY803Jun 1938 - Sep 1992(1)
06270450Can_beCkCanyon Creek below Cooks Canyon, Near Tensleep, WY72Apr 1969 - Sep 1971
06270500Can_TenCanyon Creek near Tensleep, WY86Jun 1939 - Sep 1944
06271000Ten_TenTensleep Creek near Tensleep, WY247Oct 1910 - Oct 1972(1)
06272500Pnt_HyatPaintrock Creek near Hyattville, WY164Aug 1920 - Sep 1953(1)
06273000Med_HyatMedicine Lodge Creek near Hyattville, WY87Oct 1943 - Sep 1973(1)
06273500Pnt_beHyatPaintrock Creek near Mouth Below Hyattville, WY376Aug 1910 - Dec 1922(1)
06274000No_BonzNowood River at Bonanza, WY1,730Aug 1910 - Sep 1928(1)
06271500Pnt_LkSolPaintrock Creek below Lake Solitude, WY16Sep 1946 - Sep 1953(1)
Greybull 06274500Gry_PtFkGreybull River near Pitchfork, WY282May 1946 - Sep 1971(1)
06274800Wod_nrKirWood River near Kirwin, WY8Oct 1970 - Sep 1975
06274810Wod_atKirWood River at Kirwin, WY11Oct 1975 - Sep 1978
06275000Wod_SunWood River at Sunshine, WY194Sep 1945 - Sep 1992
06275500Wod_MetWood River near Meeteetse, Wyo.211Oct 1936 - Sep 1949
06276000Gry_nrMetGreybull River near Meeteetse, WY659Oct 1910 - Sep 1916(1)
06276500Gry_atMetGreybull River at Meeteetse, WY681Oct 1920 - Sep 2000(1)
06277500Gry_BasGreybull River near Basin, WY1,115Oct 1930 - Sep 1973
06277950Dry_GreyDry Creek near Greybull, WY432Apr 1979 - Sep 1981
Bighorn Lake 06278000Dry_GreyDry Creek at Greybull, WY433Apr 1951 - Sep 1959(1)
06278300Shl_abResShell Creek above Shell Creek Reservoir, WY23Oct 1956 - Sep 2001
06278500Shl_nrShlShell Creek near Shell, WY145Oct 1940 - Sep 2001(1)
06279000Shl_atShlShell Creek at Shell, WY256Apr 1914 - Sep 1924(1)
06279500Bh_KaneBighorn River at Kane, WY15,765Oct 1928 - Sep 2001(1)
06286250Bh_LovBighorn River near Lovell, WY18,900Dec 1964 - Sep 1966
06286258BiC_LovBig Coulee near Lovell, WY30Apr 1970 - Sep 1978
06286260Crk_LovCrooked Creek near Lovell, WY119Dec 1964 - Nov 1967
06286270Porc_LovPorcupine Creek near Lovell, WY135Nov 1964 - Nov 1967
Shoshone 06279790Jones_PahJones Creek at Mouth, near Pahaska, WY25Mar 1989 - Sep 1993(1)
06279795Crow_PahCrow Creek at Mouth, at Pahaska, WY19Mar 1989 - Sep 1993(1)
06279800NFSh_PahNorth Fork Shoshone River at Pahaska, WY108Apr 1989 - Sep 1990(1)
06279850Mdi_YNPMiddle Creek at East Entrance YNP, WY33Oct 1981 - Sep 1984
06279940NFSh_atWapNorth Fork Shoshone River at Wapiti, WY699Oct 1989 - Sep 2000
06280000NFSh_nrWapNorth Fork Shoshone River near Wapiti, WY775Jan 1921 - Sep 1989(1)
06280300SFSh_ValSouth Fork Shoshone River near Valley, WY297Oct 1956 - Sep 2000(1)
06280500SFSh_IshSouth Fork Shoshone River near Ishawooa, WY541Jun 1915 - Oct 1923(1)
06281000SFSh_abBBSouth Fork Shoshone R above Buffalo Bill Res, WY585May 1903 - Sep 2000(1)
06281400Dia_nrCdyDiamond Creek near Mouth near Cody, WY7Dec 1980 - Sep 1992
06282000Sh_beBBShoshone River Below Buffalo Bill Reservoir, WY1,538Jan 1921 - Sep 2000
06282500Sh_CodyShoshone River at Cody, WY1,603May 1902 - Dec 1909
06283000Sho_CorbShoshone River at Corbett Dam, WY1,793May 1908 - Sep 1925(1)
06283800Sh_abWillDShoshone R ab Willwood Dam near Willwood, WY(2)Nov 1979 - Oct 1982
06284000Sh_atWillDShoshone River at Willwood Dam, WY1,833Aug 1925 - Sep 1926
06284200Sh_WillShoshone River at Willwood, WY1,980Apr 1974 - Sep 1979
06284400Sho_GarlShoshone River near Garland, WY2,036May 1958 - Sep 1979
06284500Bit_GarlBitter Creek near Garland, WY81Mar 1950 - Sep 1987(1)
06284800Whst_GarlWhistle Creek near Garland, WY101Jun 1958 - Sep 1987(1)
06285000Sh_ByrShoshone River at Byron, WY2,345Jan 1929 - Sep 1966
06285100Sh_nrLovShoshone River near Lovell, WY2,350Oct 1966 - Sep 2000
06285400Sag_atSidSage Creek at Sidon Canal, near Deaver, WY341Jun 1958 - Sep 1987(1)
06285500Sag_LovSage Creek near Lovell, WY381May 1951 - Sep 1960
06286000Sho_atLovShoshone River at Lovell, WY(1)2,832Jun 1897 - Sep 1898
06286200Sh_KaneShoshone River at Kane, WY2,989Oct 1957 - Sep 1968

Notes:
(1)Incomplete data within period-of-record.

Figure 2-8. Bighorn River Basin - Upper Bighorn Sub-Basin

Figure 2-9. Bighorn River Basin - Nowood Sub-Basin

Figure 2-10. Bighorn River Basin - Greybull Sub-Basin

Figure 2-11. Bighorn River Basin - Bighorn Lake Sub-Basin

Figure 2-12. Bighorn River Basin - Shoshone Sub-Basin

Section 3 - Study Period Selection

Because historical data is not available for all gages since the inception of data collection, and to make the model less expansive and easier to use, a representative study period has been selected from the data set. The study period is intended to be representative of the overall long-term gage records and hydrologic conditions. To be consistent within the study period, overall patterns of basin inflows, diversions and storage must remain constant through the study period. Therefore, study periods were selected to minimize the impacts of major reservoirs or diversion projects within the period of record. This required examination of reservoir and diversion construction records. Streamflow statistics within each study period were checked against long-term statistics at gages with long-term records to ensure that the data was representative of the long-term period.

The following events were considered in selection of a model study period. Note that this list of events focuses primarily on significant events during the past 50 years that could have had significant impacts on streamflow.

As shown, there is no time period that would completely eliminate impacts of new projects within the period-of-record. However, several events occurred between the 1950s and early 1970s, which would have had a substantial impact on river flows. In addition to the major projects shown above, use of more modern irrigation practices such as gated pipe and sprinklers also increased significantly during the early 1970.s. Therefore, for purposes of this study, a study period of 1973-2001 was chosen. This period is especially beneficial in that for most of the basins, both the driest and wettest years on record are contained in the study period. A statistical analysis of the selected study period for each basin is detailed below.

3.1 Madison/Gallatin River Basin

In both the Madison and Gallatin River basins, because there are no major storage reservoirs or significant surface water diversions in the area, there have been few man-made changes in river regime. Although data is available for the Madison River since the 1910.s and for the Gallatin River since the 1930.s, only more recent data is available for the Firehole and Gibbon Rivers. To remain consistent with the other basins in this study, the 1973-2001 study period has been selected for the Madison River/Gallatin River basin model.

Table 3-1 presents a statistical summary of the period-of-record and the study period for the Madison River near West Yellowstone (06037500). As shown, the average flow during the study period is approximately 5.6 percent higher than the long-term average. In addition, for the hydrologic year classification, all of the hydrologic year classification averages are higher for the study period than for the long-term period-of-record (hydrologic year classification is further discussed in the following sub-section).

Table 3-1. Statistical Summary for Madison River near West Yellowstone (06037500)
StatisticPeriod-of-RecordStudy PeriodDifference
1914 . 20011973-2001
Mean363,725384,1605.6%
Standard Deviation59,31958,978-0.6%
Avgerage . Dry Years282,765321,78913.8%
Average . Average Years356,965373,4374.6%
Average . Wet Years446,142476,9146.9%
Maximum571,071571,0710.0%
Minimum243,949319,16330.8%

The cumulative departure from the mean analysis shown in Figure 3-1 indicates that there was a more severe period of sustained low flows from 1922 - 1949 and except for a general period of lower flows from 1986 - 1994, a general trend of higher flows since that time. Two factors could be contributing to the variability in the statistical summary:

  1. the basin is influenced by naturally unstable groundwater inflows,
  2. runoff from the basin has a smaller variability from year to year, meaning small percentage changes in runoff have a more significant effect on summary statistics.

Because the general trend in the basin in river flows since 1950 is slightly higher flows than the long-term average, the period-of-record used is deemed adequate. However, if drought studies are conducted for downstream water users in the basin (downstream of Wyoming), a longer period-of-record that accounts for the lower flow conditions earlier in the 20th century should be used.

Figure 3-1. Comparison of Study Period Data to Long Term Data for Madison River near West Yellowstone (06037500)

3.2 Yellowstone River Basin

In the Yellowstone River basin, because there are no major storage reservoirs or significant surface water diversions in the area, there have been few man-made changes in river regime. In addition, data is available in part for several gages since the mid-1920s. Therefore, the study period for the Yellowstone River model could extend back through the years when data is available, or approximately 75 years. However, to remain consistent with the other basins in this study, the 1973-2001 study period has been selected for the Yellowstone River model.

Table 3-2 presents a statistical summary of the period-of-record and the study period for the Yellowstone River at Corwin Springs. As shown, the average flow during the study period is approximately 1.1 percent higher than the long-term average. For the hydrologic year classification, the drier years are slightly drier than the long-term average, while the wet years are slightly wetter than the long-term average. This will tend to make the model slightly conservative regarding water supply. However, if excess water were used to fill a reservoir used for carryover storage, the model may show that there is more water available during wet years to fill the reservoir than what has been available during the long-term average (hydrologic year classification is further discussed in the following sub-section).

Table 3-2. Statistical Summary for Yellowstone River at Corwin Springs
StatisticPeriod-of-RecordStudy PeriodDifference
1911 . 20011973-2001
Mean2,264,6722,290,5311.1%
Standard Deviation496,186 553,59411.6%
Avgerage . Dry Years1,611,9851,583,982-1.7%
Average . Average Years 2,242,0182,259,9730.8%
Average . Wet Years 2,986,5793,083,6613.3%
Maximum3,733,9843,733,984 0.0%
Minimum1,377,8981,432,2643.9%

The cumulative departure from the mean analysis shown in Figure 3-2 indicates that there was a more severe period of sustained low flows (1928-1946) and a more significant period of sustained high flows (1961-1976) in the period-of-record than what is reflected in the study period. However, since the model includes on a single year analysis for each hydrologic condition, the hydrologic year classification is conservative, and because there is no long-term carryover water supply storage in the basin, this should not affect the results.

Figure 3-2. Comparison of Study Period Data to Long Term Data for Yellowstone River at Corwin Springs (06191500)

3.3 Clarks Fork River Basin

Although the Clarks Fork River basin does not have any major storage reservoirs within the study area, there are some minor diversions which affect river flows. However, in general, operations of those diversions have not changed for many years. In addition, the diversions are relatively minor in magnitude compared with the magnitude of river flows. Therefore, there likely has not been a significant change in river regime. Data is available in part for the Clarks Fork near Belfry gage since the early 1920s. However, all other gages will require significant filling for use in the model. Therefore, the study period for the Clarks Fork model could extend back through the years when data is available at the Belfry gage, or approximately 80 years. However, to remain consistent with the other basins in this study, the 1973-2001 study period has been selected for the Clarks Fork model.

Table 3-3 presents a statistical summary of the period-of-record and the study period for the Clarks Fork Yellowstone River near Belfry. As shown, the average flow during the study period is approximately 2.0 percent less than the long-term average. In addition, the hydrologic year averages for the study period are all slightly less than the long-term average, which results in the model being slightly conservative towards water supply in general (hydrologic year classification is further discussed in the following sub-section).

Table 3-3. Statistical Summary for Clarks Fork Yellowstone river near Belfry (06207500)
StatisticPeriod-of-RecordStudy PeriodDifference
1922 . 20011973-2001
Mean678,048664,349-2.0%
Standard Deviation156,308 170,9199.3%
Avgerage . Dry Years482,266430,150 -10.8%
Average . Average Years659,734658,300-0.2%
Average . Wet Years928,773915,688-1.4%
Maximum1,075,109 1,075,1090.0%
Minimum395,919395,9190.0%

The cumulative departure from the mean analysis shown in Figure 3-3 indicates that the study period will contain the most prolonged period of sustained high flows (1969-1976) as well as a prolonged period of sustained low flows (1982-1994). In addition, the study period contains the single highest and fifth highest high flows and six of the seven lowest flows in the period-of-record. These statistics all indicate that the period-of-record is conservatively representative of the long term data from a water supply perspective.

Figure 3-3. Comparison of Study Period Data to Long Term Data for Clarks Fork Yellowstone River near Belfry (06207500)

3.4 Wind River Basin

Although flows in the Wind River basin are significantly impacted by major storage reservoirs and irrigation diversions, the construction and operations of those facilities within the basin have remained fairly constant through the study period. The two return flow reservoirs previously mentioned, Lake Cameahwait Reservoir and Middle Cottonwood Creek Reservoir, have no impact on upstream river flows. Data is available for several gages within the basin for fairly long and significant time periods, especially gages located in the Upper Wind basin. Records in the Little Wind River basin are shorter in length, with several of the more important gages starting recording in the late 1970s and early 1980s or in the early 1990s. Therefore, record extensions were required for those gages.

Table 3-4 presents a statistical summary of the period-of-record and the study period for the Little Wind River near Riverton. As shown, the average flow during the study period is approximately 2.2 percent less than the long-term average. For the hydrologic year classification, the dry and average years are slightly drier than the long-term average, while the wet years are slightly wetter than the long-term average, which will generally make the model slightly conservative regarding water supply. However, if excess water were used to fill a reservoir for carryover storage, the model may show that there is slightly more water available to fill the reservoir during wet years than what has been available during the long-term average (hydrologic year classification is further discussed in the following sub-section).

Table 3-4. Statistical Summary for Little Wind near Riverton (06235500)
StatisticPeriod-of-RecordStudy PeriodDifference
1942 . 20011973-2001
Mean417,778408,775-2.2%
Standard Deviation151,116 169,19712.0%
Avgerage . Dry Years212,305199,337-6.1%
Average . Average Years415,338396,907-4.4%
Average . Wet Years630,568 651,8413.4%
Maximum739,201739,2010.0%
Minimum 126,379126,3790.0%

The cumulative departure from the mean analysis shown in Figure 3-4 indicates that the study period will contain a prolonged period of generally sustained low flows (1986-1994) as well as a prolonged period of generally sustained high flows (1994-1999). In addition, the study period contains the three highest high flows and three of the four lowest flows in the period-of-record. These statistics all indicate that the period-of-record is conservatively representative of the long term data from a water supply perspective. It should be remembered that this gage is heavily influenced by irrigation diversions and return flows. However, if it is assumed that these demands and return flows are relatively constant through the study period and long-term period-of-record, then the diversions and return flows do not influence the relative comparisons. In addition, it should be noted that the dry, average and wet years used in the comparison before the study period (prior to 1973) were developed using this gage (06235500) and not the index gage (06224000). Again, this should be negligible for this type of analysis.

Figure 3-4. Comparison of Study Period with Long Term for Little Wind at Riverton (06235500)

3.5 Bighorn River Basin

As with the Wind River Basin, flows in the Bighorn River Basin are significantly impacted by major storage reservoirs and irrigation diversions. In the Upper Bighorn, Nowood and Bighorn Lake River basins, the operations of the diversions and reservoirs have remained fairly constant through the study period. However, storage improvements in the Greybull River (Greybull Valley Reservoir) and the Shoshone River (Buffalo Bill Reservoir) have had an impact on downstream flows in those basins. The impacts of these facilities are described below.

Table 3-5 presents a statistical summary of the period-of-record and the study period for the Shell Creek near Shell. As shown, the average flow during the study period is approximately 0.2 percent less than the long-term average. For the hydrologic year classification, the dry years are significantly drier than the long-term average, the wet years are slightly drier and the average years slightly wetter than the long-term averages. With the drier years, the dry years will generally make the model slightly conservative regarding water supply.

Table 35. Statistical Summary for Shell Creek Near Shell (06278500)
StatisticPeriod-of-RecordStudy PeriodDifference
1941 . 20011973-2001
Mean70,87970,758-0.2%
Standard Deviation14,25813,904 -2.5%
Average . Dry Years64,54550,416-21.9%
Average . Average Years 71,81272,0460.3%
Average . Wet Years89,19287,452-2.0%
Maximum98,39498,3940.0%
Minimum37,37437,3740.0%

The cumulative departure from the mean analysis shown in Figure 3-5 indicates that the study period contains a consistent mix of dry and wet years. The study period does not contain a sustained period of either wet or dry years, as is shown in other locations within the period-of-record. However, because this analysis does not explicitly simulate carryover storage, this should not pose problems. The study period does contain both the wettest and driest years in the period-of-record. These statistics generally indicate that the period-of-record is conservatively representative of the long term data from a water supply perspective. It should be remembered that this gage is heavily influenced by irrigation diversions and return flows. However, if it is assumed that these demands and return flows are relatively constant through the study period and long-term period-of-record, then the diversions and return flows do not influence the relative comparisons.

Figure 3-5. Comparison of Study Period Data to Long Term Data for Shell Creek Near Shell (06278500)

Section 4 - Data Filling and Extension

Many of the gages used in the model have an incomplete record or have periods within the record where data is missing. Therefore, in order for the gage data to be used in the model, the period-of-record for the gage requires either extension or filling. For purposes of this analysis, the same methodologies were used for both filling of gage records and extension of gage records. In addition, the gage records were only filled or extended for those periods in the selected study period (1973-2001). Methodologies for determining the study period are discussed in previous sections.

Many methods can be used for filling gage records. The most common and easiest to use method is regression of measured streamflow at the dependent gage (the gage where data filling is required) to measured streamflow at the independent gage (the gage where data exists for the missing period). Once this mathematical relationship is established, measured data from the independent gage can be used to estimate the streamflow for the dependent gage. Typical regression relationships can be based on linear, polynomial, power or logarithmic relationships. For this study most of the strongest relationships were found to be either linear or polynomial in nature. The measure of the degree to which the two gages correlate is typically called the correlation coefficient (or r2 value). A correlation coefficient of 1.0 indicates perfect correlation. Therefore, those relationships with correlation coefficients closer to 1.0 have good correlation. Typically, in streamflow data filling and extension, correlation coefficients greater than approximately 0.7 are desired. When correlation coefficients are less than this value, then relationships are considered weak, and attempts to find gages with better relationships should be made. Correlations were developed between monthly streamflows.

For a majority of the gages, monthly regressions with nearby streamflow gages yielded acceptable correlations to fill the records. However, for the gages where correlations were weak, attempts were made to find other relationships to fill the streamflow values. First, regressions with precipitation data were attempted. This regression is typically more valid where snowmelt is not a significant component of streamflow, which limits its use in the study area. Another methodology that can be used is correlation between annual streamflows, then distribution of annual streamflow to monthly streamflow using historical distributions. If the annual streamflow regression correlation was weaker than the original monthly streamflow correlation, then the monthly regression was used. Finally, the streamflow record can be filled using regional equations based upon basin characteristics. However, this methodology is only used in rare occasions when the correlation coefficient is extremely weak. This methodology was not used for any of the streamflow gaging stations.

4.1 Madison/Gallatin River Basin

All three stations in the Madison River Basin required data filling. Missing data for the Madison River gage was filled using a regression relationship with the Gardner River near Mammoth (06191000) which also required filling. Correlation coefficients were 0.81 for the Madison River regression with the Gardner River while correlation coefficients were 0.89 and 0.95 for the Gibbon and Firehole River regressions, respectively. There were small gaps in Gallatin River at Gallatin Gateway data that also required filling. Again, missing data for the gage was filled using a regression relationship with the Gardner River near Mammoth gage. A summary of the regression analysis is shown in Table 4-1.

Table 4-1. Correlation Results for Madison/Gallatin River Basin
BasinGage
Number
Gage IDPercent of
Record Filled
Dependent
Gage
Corr. Coeff.r^2Correlation Equation
Madison/Gallatin06036905Firehole57%060375000.95 y = -2.0E-6x2 + 0.6751x + 699
06037000Gibbon57%060375000.89y = 2.0E-6x2 + 0.2573x -2293
06037500Mad_WstY41%061910000.81y = 0.8636x + 19478
06043500Gal_GalGt214%061910000.93y = -2.0E-5x2 + 4.9378x -8616

4.2 Yellowstone River Basin

All of the gages in the Yellowstone Headwaters Hydrologic Unit required data filling except for the Yellowstone River at Corwin Springs (06191500) gage. The Gardner River at Mammoth Gage (06191000) was filled using the Yellowstone River at Corwin Springs gage using separate regressions for January through June and July through December to account for the lagging effect caused on the Yellowstone River by Yellowstone Lake. The Yellowstone River at Yellowstone Lake outlet (06186500) and the Lamer River gages (06188000) were filled using the same methodology. These gages were then used as independent gages for the remaining regressions. Correlation coefficients ranged from 0.87 to 0.98, except for the Yellowstone River at Yellowstone Lake outlet, where the correlation coefficients were 0.87 for the January through May regression, 0.68 for the June regression and 0.98 for the July through December regression. Regressions were not performed at various other gages due to regulation of flows or lack of data. A summary of the regression analysis is shown in Table 4-2.

Table 4-2. Correlation Results for Yellowstone River Basin
BasinGage
Number
Gage ID Percent of
Record Filled
Dependent
Gage
Corr. Coeff.r^2 Correlation Equation
Yellowstone06186500Yl_LkOut10% 061915000.87y = 2.0E-8x2 + 0.1324x + 18099
(Jan-May)
0.68y = 2.0E-7x2 + 0.0042x + 121403
(Jun)
0.95y = -4.0E-7x2 + 0.8036x .15813
(Jul-Dec)
06187000Yl_CnHot100%061865000.94y = 0.9884x + 13052
06187500Tow_TowF100%061915000.96y = 2.0E-8x2 + 0.0054x + 768
06187915Sod_Slv---(1) ---
06187950Sod_LRS55%061915000.94y = 0.0549x .1874
06188000Lam_TRS52%06191500 0.98y = -4.0E-8x2 + 0.4509x .15332
(Jan-Jun)
0.94y = 2.0E-7x2 + 0.0986x .660
(Jul-Dec)
06188500EFBl_Mam100%061910000.88y = 2.0E-7x2 + 0.0181x .84
06189000BlD_Mam83%061910000.85y = 0.0661x .249
06190000Lup_Mam100%061910000.98y = 0.0302x .97
06190500Gard_Mam---(5)---
06190540Hot_Mam---(2)---
06191000Gard_nrMam---06191500 0.94y = -1.0E-8x2 + 0.0715x + 1918
(Jan-Jun)
0.94y = 4.0E-8x2 + 0.0143x + 5677
(Jul-Dec)
06191500Yl_CSp0%(---)---

Notes:
(---) No regression needed.
(1) Not enough data for regression.
(2) Too regulated for regression.
(3) Too little inflow to compute.
(4)Canal, drain, etc.
(5) Gage not needed for analysis.

4.3 Clarks Fork River Basin

The Clarks Fork Yellowstone River near Belfry, Montana gage (06207500) has an extensive period-of-record. This gage is located just upstream of the confluence of the Clarks Fork and Big Sand Coulee. However, all other gages will require extensive filling to be used in the model. The two remaining Clarks Fork gages as well as the Sunshine Creek gage (06206500) were filled using the Belfry gage. However, not enough data was available or flows were too small for a regression of the remaining gages. Other methods of streamflow estimation were required for these gage locations. The correlation coefficients were fairly strong for all three gages, ranging from 0.97 to 0.99. A summary of the regression analysis is shown in Table 4-3.

Table 4-3. Correlation Results for Clarks Fork River Basin
BasinGage
Number
Gage IDPercent of
Record Filled
Dependent
Gage
Corr. Coeff.r^2Correlation Equation
Clarks Fork06205500CFk_abSqC100%062075000.97y = 0.4640x -2201
06205950Ldg_Pnt---(1)---
06206000Cfk_blCrC100%062075000.99y=0.8234x -4569
06206500Sun_Pnt100%062075000.97y = 0.1322x + 74
06207000CFk_nrClk---(5)---
06207500Cfk_BlfMT0%(---)---
06207507BigS_nrBdg---(3)---
06207510BigS_Line---(2)---
06207540STip_BlfMT---(3)---

Notes:
(---) No regression needed.
(1) Not enough data for regression.
(2) Too regulated for regression.
(3) Too little inflow to compute.
(4) Canal, drain, etc.
(5) Gage not needed for analysis.

4.4 Wind River Basin

Because of its geographic expanse, flows in the Wind River basin are derived from a variety of sources with unique influences on streamflow, such as the Wind River range, the Owl Creek range, Beaver Rim and the high plains divide between the Wind Basin and the Platte Basin. Therefore, estimation of streamflows is unique to each sub-basin and/or flow source. Correlation results for each of the gages in the Wind River Basin are shown in Table 4-4.

There are several currently operating gages on the Wind River and its tributaries. In addition, most gages used in the analysis have at least a portion of their data contained within the study period. The key headwaters gage within the Upper Wind hydrologic unit is Bull Lake Creek above Bull Lake (06224000). This gage was used to fill several of the headwaters gages in the upper portion of the hydrologic unit originating from the Wind River Range or Absaroka Range. The Wind River near Crowheart (06225500) gage was used to fill the Wind River above Red Creek gage (06220800), while the Wind River at Riverton gage (06228000) was used to fill Wind River gages located lower in the basin. Correlation coefficients for these regressions ranged from 0.86 to 0.95. One gage was not filled because it is too regulated for a regression analysis, while two gages were not filled because there is not enough data for a regression analysis.

Analysis of available data shows that runoff from the Owl Creek mountains occurs at different times of the year and at different magnitudes than runoff from the Wind River range or the Absoraka range. The only gage measuring runoff from the Owl Creek mountains in the Upper Wind hydrologic unit is the Crow Creek gage (06222700), which has data from the mid 1960.s to the mid 1990.s. There are gages on other tributaries from the Owl Creeks in the Lower Wind hydrologic unit, but these gages are more heavily influenced by irrigation return flows and have shorter periods-of-record. Although the hydrologic characteristics are different, a regression analysis remains the preferred option for extending data if a correlation can be found. The Bull Lake Creek above Bull Lake gage was used to extend the Crow Creek gage data with a resulting correlation coefficient was 0.75.

The South Fork above Washakie Reservoir gage, which is located above all storage and diversion influences, has data from the late 1970.s to present. In addition, the Little Wind near Riverton gage, which is downstream of all major diversions within the basin, has data from the early 1940.s to present. There are several other gages which have data for a portion of the study period (described in later sections), but will require filling for the remainder of the study period. The South Fork Little Wind above Washakie Rservoir gage (06228350) was filled using the Bull Lake Creek above Bull Lake gage (06224000). Then, the gage was used to fill the South Fork Little Wind below Washakie Reservoir gage (06228450). The Little Wind above Arapahoe gage (06231000) was filled using the Little Wind near Arapahoe gage. Although these gages are influenced by diversions, there are no major diversions between the gages, making the correlation between the two gages relative strong. Correlation coefficients ranged from 0.59 at the Trout Creek gage (06229900) to 0.97 at the Little Wind above Arapahoe gage. The Trout Creek gage correlation coeffecient is low, but because the tributary is relatively small, it was deemed adequate for modeling purposes. Several gages were too regulated for data filling using headwaters gages and the Little Wind near Arapahoe (06230500) gage did not have enough data for a regression analysis. These gages will be located in the model as flow accumulation nodes but will not be used for calibration purposes.

There are several gages within the hydrologic unit that contain a significant amount of data. However, because many of the gages flow only intermittantly and are heavily influenced by agricultural activities, filling the missing data becomes more difficult. The Fivemile Creek near Shoshoni gage (06253000) requires filling for only six years. However, regressions with other gages did not yield acceptable correlation coefficients. In addition, regressions with both monthly and annual precipitation also did not yield acceptable results. Therefore, the data was filled using a regression with annual inflows into Boysen Reservoir that are not attributable to the Wind River. This data was calculated by subtracting Wind River at Riverton flows from total Boysen Reservoir inflows. The resulting correlation coefficient was 0.45, which is significantly below a normal acceptable level. However, because the data period filled is relatively short, because the amount of inflows to the model represented by Fivemile Creek are relatively small and because it is the best available flow estimation technique, the results were deemed acceptable for this analysis.

The Fivemile Creek near Shoshoni gage data was used to fill several other gages in the basin. Correlation coefficients for these gages were 0.98, 0.91 and 0.53, respectively. Again, the 0.53 is significantly lower than the desired correlation for streamflow regressions. However, because the stream is intermittant, and because its contribution to flow is relatively small, the correlation was deemed acceptable for this analysis. The Fivemile Creek near Pavillion (06245000) and Poison Creek near Shoshoni (06255500) gages did not have enough data in the period-of-record to perform a regression analysis with another gage. Several other gages had too little and unseasonably variable flow to perform the regression analysis.

None of the gages in the Badwater Creek sub-basin are currently operating, with the most recent data in 1980. Therefore, all of the gages required filling before they could be used in the model. Since these gages exhibit flow patterns which are unique to this basin orientation, existing streamflow records from other sites in the Wind River basin could not be used as dependent gages for the regression. Therefore, the Badwater Creek at Bonneville gage was filled using annual precipitation at Black Mountain. The annual flow was then distributed on a monthly basis using the average monthly distribution from the period-of-record flows. The Badwater Creek at Lysite (06256500) and Bridger Creek near Lysite (06256800) gages were then filled using the Bonneville gage. Finally, the Dry Creek gage (06256900) was filled using the Lost Cabin gage. The Badwater Creek at Lost Cabin gage (06256500) was not filled because the period-of-record was too short to regress. A summary of the regression analysis is shown in Table 4-4.

Table 4-4. Correlation Results for Wind River Basin
BasinGage
Number
Gage IDPercent of
Record Filled
Dependent
Gage
Corr. Coeff.r^2Correlation Equation
Upper Wind 06218500wind_nrDub31%062240000.82y = 0.4634x + 2361
06220000Wind_atDub---(1)---
06220500EFWind_Dub24%062240000.85y = 0.7749x + 1060
06220800Wind_RedCk62%062255000.90y = 0.6110x -3105
06221400Din_abLks34%062240000.90y = 0.4349x + 863
06221500Din_Bur---(2)---
06222000Wind_Bur---(1)---
06222500DryCk_Bur64%062240000.95y = 7.0E-7x2 + 0.1255x + 50
06222700CrowCk_Tip28%062240000.75y = 0.0714x + 17
06223000MdCk_Len---(1)---
06223500WlCk_Crow67%062240000.86y = 1.0E-6x2 -0.0021x + 350
06224000BlCk_abLk0%(---)---
06225000BlLk_Len0%(---)---
06225500Wind_Crow0%(---)---
06227600Wind_Kin53%062280000.95y = 1.2547x + 564
06228000Wind_Riv0%(---)---
06236100wind_abBoy61%062280000.96y = 1.9702x + 8009
Little Wind 06228350SFLW_abWRes14%062240000.96y = 2.0E-6x2 + 0.3301x + 485
06228450SFLW_blWRes55%062283500.95y = 0.8885x + 605
06228500LW_FtWa---(2)---
06228800NFLW_nrFW55%062240000.93y = 2.0E-6x2 + 0.3302x + 815
06229000NFLW_atFW---(2)---
06229680Sage_Nork82%062240000.83y = 6.0E-7x2 -0.0074x + 289
06229900Trout_FW71%062240000.60y = 3.0E-7x2 + 0.0030x + 289
06230190Mill_abRL78%062240000.72y = 2.0E-7x2 + 0.0025x + 108
06230500LW_nrArap---(1)---
06231000LW_abArap45%062355000.97y = 2.0E-7x2 + 0.3287x -182
06234000LW_blArap---(1)(2)---
06234500Beav_nrLnd---(2)---
06235000Beav_nrAr---(2)---
06235500LW_Riv0%(---)---
Lower Wind 06239000Musc_Sho---(2)---
062445005mi_aPav---(3)---
062450005mi_Pav---(1)---
062500005mi_Riv100%062330000.98y = 1.8852x -197
06251500Sand_Sho100%062330000.91y = 0.1985x -18
062530005mi_Sho21%(6)0.45y = 502.4x
06255500Poi_Sho---(1)---
06257500Mud_Pav---(3)---
06258000Mud_Sho62%062530000.53y = 2.0E-6x2 + 0.0718x + 314
06258500Dcot_Bon---(3)---
06259000Wind_blBy---(1)---
Badwater 06256000Bad_Lyb100%062570000.72y = 9.0E-6x2 + 0.4853x + 109
0625650Bad_LC---(1)---
06256650Bad_Lys97%062560000.84y = 8.0E-5x2 + 0.5778x + 195
0625680Bri_Lys97%062560000.89y = 5.0E-5x2 + 0.2819x + 307
06256900Dry_Bon72%062566500.81y = 4.0E-6x2 + 0.0150x
06257000Bad_Bon97%(7)0.46y = 3790x .15152

Notes:
(---) No regression needed.
(1) Not enough data for regression.
(2) Too regulated for regression.
(3) Too little inflow to compute.
(4) Canal, drain, etc.
(5) Gage not needed for analysis.
(6) Annual Non-Wind River Computed Inflows to Boysen Reservoir
(7) Annual Black-Mountain Precipitation
4.5 Bighorn River Basin

As with the Wind River Basin, because of its geographic expanse, flows in the Bighorn River basin are derived from a variety of sources with unique influences on streamflow, such as the Absoroka Range, the Owl Creek range, the Bighorn Mountains and the interior high plains of the Bighorn Basin. Therefore, estimation of streamflows is unique to each sub-basin and/or flow source. Correlation results for each of the gages in the Wind River Basin are shown in Table 4-5.

The Upper Bighorn Basin does not contain any gages that have data for the entire study period, and there are only three gages that are currently operational. The Wind River below Boysen gage (06259000) was used to fill Bighorn River gages, including the gages at Thermopolis, Worland and Basin. Correlation coefficients ranged from 0.85 to 1.00. As expected, as the Bighorn River gages further downstream are more influenced by irrigation diversions and return flows, the data is less well correlated. Key gages in the basins west of the Bighorn River included the USBR.s record of Anchor Reservoir computed inflow, Anchor Reservoir releases, and the South Fork of Owl Creek near Anchor Reservoir gage (0626000). Correlation coefficients for these gages ranged from 0.57 to 0.98, with only the Gooseberry Creek at Dickie (06265800) having a correlation coefficient less than 0.7 This correlation was determined to be acceptable because a better correlation using other gages could not be calculated.

There are currently no active gages in the Nowood River basin, and only the Nowood River at Tensleep gage (06270000) has significant data within the period-of-record Several correlation attempts were made with nearby gages from different basins to extend the record of this gage. However, none of those attempts yielded acceptable results. Therefore, the annual gage record was extended using the annual precipitation at Black Rock Mountain. The annual value was distributed monthly using the average monthly distribution of the actual gage data. This gage was then used to extend the record at the Canyon Creek at Tensleep gage (06270500). The correlation coefficient was 0.65, slightly less than the desired value of 0.70. However, no other methods or gages yielded better correlations. The remaining gages in the basin were extended using Shell Creek gages, all of which had correlation coefficients greater than 0.90.

The Greybull River at Meeteetsee gage (06276500) is the only currently active gage in the Greybull River basin. However, the data for this gage is only collected in the late spring, summer and early fall months when the river is not frozen. Therefore, the South Fork Shoshone at Valley gage (06280300) was used to fill the winter month flows. Although the correlation coefficient of 0.67 is below the desired value of 0.70, the only flows filled are during the winter, which are less important in the overall annual hydrograph. Therefore, it was deemed acceptable for this study. The remainder of the gages in the basin were filled using the Greybull River at Meeteetsee gage, with correlation coefficients ranging from 0.74 to 0.94.

The Bighorn Lake basin contains gages along the mainstem of the Bighorn River and in several tributary sub-basins, including the Shell Creek sub-basin. Gages in the Shell Creek, Porcupine Creek and Crooked Creek sub-basins were filled using the Shell Creek above Shell Reservoir gage, with correlation coefficients ranging from 0.79 to 0.94. The Dry Creek gage (06278000) was filled using the Greybull River at Meeteetsee gage. The correlation coefficient for this regression was below the target of 0.7. However, because the flows in the creek are small and there are no major diversions, the correlation was deemed acceptable.

Two gages were used to fill missing data in the Shoshone River basin. For the upper portions of the basin (above Buffalo Bill Reservoir), the South Fork Shoshone near Valley gage (0628300) was used, while for the lower portions of the basin, the Shoshone River near Lovell gage (06285100) was used. Both of these gages have data for the entire study period and are active gages. Correlation coefficients for the upper gages ranged from 0.66 to 0.98, with a majority greater than 0.90. Correlation coefficients for the lower basin were all greater than 0.90. Several of the gages could not be filled because their period-of-record was not long enough, the flow was too regulated for a regression analysis.

Table 4-5. Correlation Results for Bighorn River Basin
BasinGage
Number
Gage IDPercent of
Record Filled
Dependent
Gage
Corr. Coeff.r^2Correlation Equation
Upper Bighorn 06259500Bh_Therm100%062590001.00y = 1.0072x + 2830
06260000SFOwl_nrAnc40%09999001(6)0.81y = 3.0E-5x2 + 1.0239x + 378
06260200MdOwl_abAnc---(3)---
06260400SFOwl_blAnc24%09999002(7)0.98y = 0.9511x + 12
06260500SFOwl_Crt---(2)---
06261000SFOwl_acrn---(1)(2)---
06261500SFOwl_nrTh---(1)(2)---
06262000NFOwl_nrAnc100%062600000.81y = 0.3515x + 44
06262300NFOwl_abBR81%062600000.75y = 0.3378x + 89
06262500NFOwl_atCR---(1)---
06263000NFOwl_nrTh---(1)---
06263500Mud_Th---(1)---
06264000Owl_Th---(2)---
06264500Owl_Luc---(2)---
06265000Kirb_Luc---(1)---
06265337Cot_HamD71%09999001(6)0.73y = 0.4244x + 98
06265500Cot_Win---(1)---
06265800Gos_atDk79%09999001(6)0.57y = 0.4687x + 244
06266000Gos_Grs---(1)(2)---
06266500Gos_nrDk---(1)---
06267000Gos_Nei---(2)---
06267400Now_Colt---(3)---
0626850015mi_Wor---(3)---
06268600Bh_Wor100%062590000.91y = 1.0101x -16486
06269000Bh_nrMand---(1)---
06269500Bh_atMand---(1)---
06271500Pr_beLSol---(1)---
06274300Bh_Bas38%062590000.85y = 1.2616x + 3749
Nowood 06270000Now_Ten31%Prc-BlRk0.00
06270450Can_beCk---(1)---
06270500Can_Ten100%062700000.65y = 0.1047x + 1065
06271000Ten_Ten100%062783000.91y = 2.3956x + 2752
06272500Pnt_Hyat100%062785000.96y = 1.3242x -1755
06273000Med_Hyat97%062783000.90y = 0.6754x + 571
06273500Pnt_beHyat---(1)(2)---
06274000No_Bonz---(1)(2)---
06271500Pnt_LkSol---(1)---
Greybull 06274500Gry_PtFk100%062765000.89y = 0.6108x -1196
06274800Wod_nrKir90%062765000.92y = 9.0E-8x2 + 0.0348x + 105
06274810Wod_atKir90%062765000.94y = 9.0E-7x2 + 0.0063x + 51
06275000Wod_Sun31%062765000.87y = 0.3230x + 627
06275500Wod_Met100%062765000.80y = 0.3337x + 1121
06276000Gry_nrMet---(1)---
06276500Gry_atMet51%062803000.67y = 0.7542x + 402
06277000BeCan_Brl---(4)---
06277500Gry_Bas97%062765000.74y = 3.0E-6x2 + 0.2472x + 4141
06277950Dry_Grey---(1)---
Bighorn Lake 06278000Dry_Grey100%062765000.51y = 0.0403x + 685
06278300Shl_abRes3%(---)---
06278500Shl_nrShl51%062783000.92y = 2.1704x + 2357
06279000Shl_atShl---(1)---
06279500Bh_Kane0%(1)---
06286250Bh_Lov---(1)---
06286258BiC_Lov---(3)---
06286260Crk_Lov100%062783000.79y = 3.0E-6x2 + 0.0529x + 461
06286270Porc_Lov100%062783000.94y = 1.1576x + 800
Shoshone 06279790Jones_Pah90%062803000.66y = 0.0957x + 1080
06279795Crow_Pah90%062803000.89y = -1.0E-7x2 + 0.0843x -176
06279800NFSh_Pah97%062803000.66y = 3.0E-6x2 + 0.1795x + 7410
06279850Mdi_YNP90%062803000.98y = 7.0E-7x2 + 0.0904x + 355
06279940NFSh_atWap59%062803000.96y = -8.0E-7x2 + 2.2210x -1089
06280000NFSh_nrWap64%062803000.95y = 5.0E-7x2 + 1.9994x + 1509
06280300SFSh_Val0%(---)---
06280500SFSh_Ish---(1)---
06281000SFSh_abBB3%062803000.96y = 4.0E-6x2 + 0.5169x + 1949
06281400Dia_nrCdy---(3)---
06282000Sh_beBB0%(---)---
06282500Sh_Cody---(1)---
06283000Sho_Corb---(1)---
06283800Sh_abWillD90%062851000.98y = 1.0E-6x2 + 0.4491x + 10798
06284000Sh_atWillD---(1)---
06284200Sh_Will81%062851000.98y = 7.0E-7x2 + 0.7665x + 4854
06284400Sho_Garl76%062851000.93y = 8.0E-7x2 + 0.6562x -1201
06284500Bit_Garl---(2)---
06284800 Whst_Garl---(2)---
06285000Sh_Byr---(5)---
06285100Sh_nrLov0%(---)---
06285400Sag_atSid---(2)---
06285500Sag_Lov---(2)---
06286000Sho_atLov---(1)---
06286200Sh_Kane100%062851000.97y = -3.0E-7x2 + 1.1130x + 7405

Notes:
(---) No regression needed.
(1) Not enough data for regression.
(2) Too regulated for regression.
(3) Too little inflow to compute.
(4) Canal, drain, etc.
(5) Gage not need for analysis.
(6) Anchor Reservoir computed inflows
(7) Anchor Reservoir releases

Section 5 - Ungaged Headwaters Site Data Estimation

In order for the model to accurately simulate streamflow and diversions for the entire basin, an estimation of streamflow above all diversions is required. However, in many parts of the basin, there are no streamflow gaging stations above the most upstream diversion on the stream. Therefore, streamflow upstream of the diversion must be estimated. Two methods are available to make these estimations:

  1. estimate streamflow based on regional equations which are a funtion of basin characteristics such as location, elevation and orientation;
  2. estimate streamflow by adding diversions and subtracting inflows from the closes downstream gage.

For most locations, the regional equation methodology was used to estimate streamflow for ungaged headwaters sites. However, in areas where this methodology yielded implausible results, such as the streamflow being less than the actual measured diversion, or the streamflow being greater than the next downstream gage adjusted for inflows and diversions, then the estimated headwaters flows were adjusted based on the available data. More detailed explanations are found in the detailed model description chapters.

For the study area, two sources of regional regression equations are available for estimating natural flows. The USGS (Rankl, 1994) has published monthly regression equations for the Wind River basin based upon several physical basin characteristics, including drainage area, mean basin elevation, basin slope, maximum basin relief and mean annual precipitation. Discharges are given for the 10, 50, 70 and 90 percent exceedance levels (Q10, Q50, Q70 and Q90). For purposes of this report, Q10 was used for wet years, Q50 was used for average years and Q90 was used for dry years. Monthly regional regression equations for the entire state of Wyoming were developed by Miselis (1999). Equations were developed for the Wind, Bighorn and Absoraka ranges within the study area, are a function of drainage area and precipitation. Table 51 presents the regression equations from these sources. As shown, the USGS study was used for the Wind River basin (because the study was more specific to this basin) while the Miselis data was used for the other two areas. The specific set of equations used for each site is shown in the tables for each river basin.

Physical basin data was developed through GIS using tiled 30 meter Digital Elevation Models (DEMs) from the USGS. Drainage basins were delineated using the BASIN1 extension (Petras, 2000), with the lowest point in the drainage generally taken as the most downstream point on the stream immediately upstream of the first diversion on the stream. In some cases, this was modified as needed to include or exclude portions of the drainage area. From the drainage area, the extension calculates several basin parameters that are used directly in the equations or used to calculate parameters for the equations, including average slope, and minimum and maximum elevation. For most area, average annual basin precipitation was developed from the 2000 meter PRISM coverage available for the State of Wyoming (Daly and Taylor, 1997). However, it was found that for some of the higher elevations in the Wind River range, the coverage produced much higher precipitation values that those used to develop the USGS equations, thereby producing unrealistic flow values. For these areas, the precipitation was taken directly from the USGS report for those sub-basins where data was available in the report, or from the USGS source of information which was Plate 1b in the 1988 USGS report (Lowham, 1988).

Table 5-1. Regression Equations Used for Estimation of Natural Flow
MonthQ10 (cfs)Q50(cfs)Q90(cfs)
Runoff From Absaroka Range (Miselis, 1999)
JanQ = 0.05927 A1.31Q = 0.03402 A1.37Q = 0.04791 A1.26
FebQ = 0.07135 A1.26Q = 0.03247 A1.37Q = 0.03247 A1.37
MarQ = 0.14064 A1.17Q = 0.05100 A1.31Q = 0.01385 A1.47
AprQ = 1.08668 A1.02Q = 0.17865 A1.18Q = 0.05363 A1.30
MayQ = 1.80260 A1.17Q = 0.84333 A1.16Q = 0.39274 A1.10
JunQ = 1.79473 A1.21Q = 0.94254 A1.21Q = 0.37077 A1.25
JulQ = 0.96739 A1.19Q = 0.50816 A1.18Q = 0.23550 A1.19
AugQ = 0.68077 A1.09Q = 0.38753 A1.09Q = 0.17235 A1.14
SepQ = 0.62791 A1.02Q = 0.31930 A1.06Q = 0.16719 A1.10
OctQ = 0.58304 A1.01Q = 0.24406 A1.09Q = 0.07011 A1.25
NovQ = 0.26835 A1.11Q = 0.06778 A1.30Q = 0.03518 A1.35
DecQ = 0.08177 A1.28Q = 0.04419 A1.34Q = 0.00935 A1.56
Runoff From Bighorn Range (Miselis, 1999)
JanQ = 0.17438 A1.03Q = 0.17390 A0.97Q = 0.14588 A0.96
FebQ = 0.13397 A1.07Q = 0.14371 A1.01Q = 0.12379 A0.99
MarQ = 0.23036 A0.99Q = 0.15718 A1.00Q = 0.09543 A1.04
AprQ = 0.81846 A0.95Q = 0.49751 A0.84Q = 0.17848 A0.95
MayQ = 4.76650 A0.92Q = 2.95597 A0.80Q = 0.78253 A0.83
JunQ = 0.00003 A1.07 P4.03Q = 0.00087 A0.93 P2.70Q = 0.00020 A0.98 P2.82
JulQ = 0.00230 A0.91 P2.30Q = 0.00045 A0.93 P2.50Q = 0.00170 A0.83 P2.03
AugQ = 0.00778 A0.93 P1.52Q = 0.00030 A0.94 P2.44Q = 0.00355 A0.85 P1.59
SepQ = 0.47599 A0.94Q = 0.37094 A0.91Q = 0.51357 A0.74
OctQ = 0.41879 A0.95Q = 0.25281 A0.96Q = 0.26110 A0.91
NovQ = 0.30917 A0.97Q = 0.17159 A1.01Q = 0.19235 A0.96
DecQ = 0.22141 A1.01Q = 0.17080 A0.99Q = 0.15389 A0.97
Runoff in Wind River Basin above Owl Creek Confluence (including Owl Creek) (USGS, 1994)
JanQ = 0.20100 A1.05 P1.57 S-0.70Q = 0.16000 A1.07 P1.65 S-0.77Q = 0.49300 A1.15 P1.70 S-1.07
FebQ = 0.31800 A1.07 P1.55 S-0.78Q = 0.58500 A1.23 P1.26 R-0.74Q = 0.31600 A1.31 P1.36 R-0.80
MarQ = 1.52000 A1.18 P1.13 R-0.73Q = 1.02000 A1.26 P1.17 R-0.78Q = 1.24000 A1.34 P1.07 R-0.85
AprQ = 15.5000 A1.15 P1.25 R-0.89Q = 19.7000 A1.26 P0.93 R-0.95Q = 8.62000 A1.30 P0.80 R-0.89
MayQ = 0.92500 A0.86 P2.54 R-0.69Q = 0.29100 A0.88 P2.72 R-0.69Q = 0.02380 A0.85 P3.03 R-0.57
JunQ = 0.00451 A0.66 P2.87Q = 0.00042 A0.71 P3.41Q = 0.00010 A0.85 P3.54 E3.11
JulQ = 0.00314 A0.94 P2.46 E3.79Q = 0.00042 A0.95 P2.90 E4.65Q = 0.00027 A1.03 P2.66 E6.08
AugQ = 0.00126 A0.99 P2.34 E5.49Q = 0.00044 A1.02 P2.45 E5.29Q = 0.00003 A1.19 P2.88 E6.06
SepQ = 0.00138 A1.00 P2.09 E3.62Q = 0.00045 A1.04 P2.21 E3.04Q = 0.00008 A1.09 P2.53 E3.16
OctQ = 0.00081 A0.97 P2.14Q = 0.00073 A0.96 P2.02Q = 0.00033 A1.01 P2.04
NovQ = 0.00223 A0.97 P1.68Q = 0.00201 A0.96 P1.60Q = 0.00139 A1.01 P1.48
DecQ = 0.00258 A0.95 P1.56Q = 0.00124 A0.96 P1.67Q = 0.00068 A1.06 P1.56
Notes:

(1) Q - Mean Monthly Discharge (cfs)S - Basin Slope (feet/mile)
A - Drainage Basin Area (sq. mi.)R - Maximum Basin Relief (feet/10000 feet)
P - Mean Annual Precipitation (in)E . Mean Basin Elevation

5.1 Madison/Gallatin River Basin

No natural flow nodes were needed for the Madison/Gallatin River Basin.

5.2 Yellowstone River Basin

No natural flow nodes were needed for the Yellowstone River Basin.

5.3 Clarks Fork River Basin

Several natural flow nodes were required in the Clarks Fork River Basin. Because all basins originate in the Absaroka Range, the Absaroka equation set was used for the calculations. Basin data is shown in Table 5-2.

Table 5-2. Natural Flow Data for the Clarks Fork River Basin
Sub-
Basin
Site NameLocationArea
(sq.mi.)
Precipitation
(in)
Slope
(ft/mile)
Relief
(ft)
Mean Elev.
(feet)
Clarks Fork YellowstoneBars Creek - Natural FlowAbsaroka2.225.81,596 3,7179,266
Bennett Creek . Natural FlowAbsaroka14.130.61,8015,3489,022
Camp Creek . Natural FlowAbsaroka2.526.71,4252,5107,743
Deadman Creek - Natural FlowAbsaroka1.625.51,1651,7917,643
Dutch Charlie Creek - Natural FlowAbsaroka1.327.21,5023,3309,313
Elk Creek . Natural FlowAbsaroka12.127.02,0173,7348,113
Gravel Bar Creek . Natural FlowAbsaroka12.135.42,7794,8989,130
Huff Creek . Native FlowAbsaroka4.632.82,1003,5838,247
Line Creek . Natural FlowAbsaroka2.526.01,7304,2787,174
Little Rocky Creek - Natural FlowAbsaroka43.532.41,7255,9879,163
Luce Reservoir - Natural FlowAbsaroka1.510.31,0409025,069
Natural Springs - Natural FlowAbsaroka0.429.92,4652,9108,009
New Meyer Creek - Natural FlowAbsaroka7.212.91,7093,8816,444
Paint Creek . Natural FlowAbsaroka8.818.61,1893,1697,247
Pat O'Hare Creek - Natural FlowAbsaroka34.618.31,8444,8007,205
Sunlight Creek - Natural FlowAbsaroka47.141.32,9384,5249,158

5.4 Wind River Basin

The USGS equation set was used for all drainages in the Wind River basin. As previously stated, mean annual basin precipitation calculated from the PRISM coverage produced monthly discharges that were significantly higher than those estimated in the original USGS study, especially in the more mountainous regions and in the high runoff months. Therefore, mean annual basin precipitation was taken directly from the USGS report for those drainages that were studied in the report. For those that were not shown in the report and were contained in the more mountainous areas, precipitation was taken from either nearby, similar basins or estimated from Plate 1b of the Lowham report. For those not within the more mountainous areas of the Wind River range, the PRISM coverage values were used (in the non-mountainous area, values seemed to be more in agreement). Basin characteristics are shown in Table 5-3.

Table 5-3. Natural Flow Data for the Wind River Basin
Sub-
Basin
Site NameLocationArea
(sq.mi.)
Precipitation
(in)
Slope
(ft/mile)
Relief
(ft)
Mean Elev.
(feet)
Upper WindAlkali Creek . Natural FlowWind8.320.01,082 2,1268,476
Bear Creek . Natural FlowWind61.923.01,665 5,0899,222
Bob Creek . Natural FlowWind23.417.01,355 5,5419,947
Dry Creek . Natural FlowWind52.322.01,562 6,62710,284
East DuNoir Creek - Natural FlowWind26.922.0 1,8824,0359,596
East Fork Wind River - Natural FlowWind52.0 20.01,8814,1969,893
Fivemile Creek . Natural FlowWind 4.117.01,0892,7339,037
Geyser Creek - Natural Flow Wind5.322.01,1922,8979,054
Horse Creek . Natural FlowWind70.515.01,8044,4729,389
Jakeys Fork . Natural FlowWind47.923.01,3795,2599,984
Little Dry Creek Natural FlowWind15.822.01,4215,0988,688
Little Horse Creek - Natural FlowWind12.415.01,0032,3268,274
Little Warms Springs Ck - Natural FlowWind12.819.01,1353,7209,096
Meadow Creek . Natural FlowWind8.817.01,5813,6458,068
Meadow Creek - Natural FlowWind8.120.01,4213,4848,902
Red Creek . Natural FlowWind14.516.01,6665,2238,855
Red Creek - Natural FlowWind0.112.41,1403747,465
Sixmile Creek - Natural FlowWind13.618.01,6824,2039,545
Torrey Creek - Natural FlowWind52.721.02,0655,90910,257
Warm Springs Creek - Natural FlowWind74.422.09023,3209,091
West DuNoir Creek - Natural FlowWind28.122.01,3283,8459,260
West Fork Dry Pasup Ck - Natural FlowWind20.519.51,6654,4238,999
Wiggins Fork - Natural FlowWind204.020.02,2235,6469,548
Willow Branch Creek - Natural FlowWind4.817.01,0682,9729,001
Wind River - Natural FlowWind102.620.09283,9608,624
Little WindBeaver Creek - Natural FlowWind78.118.17773,091 7,329
Crooked Creek - Natural FlowWind12.115.01,5873,9347,914
Mill Creek - Natural FlowWind10.114.01,0022,8906,469
Norkok Creek - Natural FlowWind7.413.05449326,093
North Fork Sage Creek - Natural FlowWind25.213.01,5065,0498,559
Pevah Creek - Natural FlowWind6.213.01,2813,2327,561
South Fork Sage Creek - Natural FlowWind14.513.01,5384,4068,284
Spring Creek - Natural FlowWind2.015.07601,5656,157
Lower WindBargee Creek - Natural FlowWind8.814.61,2093,1957,633
Dry Cottonwood Creek - Natural FlowWind2.413.11,2821,8677,257
Dry Muddy Creek - Natural FlowWind27.817.21,3394,7978,450
East Fork Sheep Creek - Natural FlowWind2.916.51,4211,7758,404
Five Mile Creek - Natural FlowWind4.610.64058206,313
Gill Meadows - Natural FlowWind0.39.22,1591,5946,037
Holland Creek . Natural FlowWind2.113.61,6323,2057,960
Ingalls Creek - Natural Flow (Spring)Wind0.211.81,4411,1756,086
McKee Grave Creek - Natural FlowWind5.415.31,4373,0357,852
Mexican Draw - Natural FlowWind2.111.61,2111,8186,176
Morrison Canyon - Natural FlowWind3.712.11,7381,9166,655
Morrison Meadows . Nat Flow (Spring)Wind0.09.21,5951845,214
Sagwup Creek - Natural FlowWind22.714.11,0472,2447,302
Shotgun Creek . Natural FlowWind5.415.81,3663,0488,032
Stagner Creek - Natural FlowWind2.311.31,5861,9626,452
Warm Springs Creek - Natural FlowWind1.412.61,5542,3797,450
West Fork Sheep Creek - Natural FlowWind6.315.61,5232,7698,042
Wood Road Canyon - Natural FlowWind1.211.61,6982,0056,536
BadwaterAlkali Creek - Natural FlowWind9.99.91673356,085
Badwater Creek - Natural FlowWind19.419.49823,3207,242
East Bridger Creek - Natural FlowWind15.915.97761,0276,260
E-K Creek - Natural FlowWind10.910.94652996,373
Lysite Creek - Natural FlowWind16.916.97471,3126,660
Meadow Creek - Natural FlowWind19.419.46456176,829
West Bridger Creek - Natural FlowWind16.616.61,0922,5956,532
West Fork Dry Creek - Natural FlowWind15.715.71,5302,5727,178

5.5 Bighorn River Basin

Natural flow drainages in the Bighorn River Basin originate in the Owl Creek range, the Absaroka Range, the Bighorn Range and on the high plains within the basin. For those that originate in the Owl Creek range and the high plains, the USGS equation set was used. This was done for two reasons:

    When the USGS equations were developed, flow stations from the Owl Creek range were used in their development. Therefore, they can be considered valid for those areas that were used in their development;

  1. Of the three equation sets, the USGS equations for the Wind River basin most closely estimate runoff in the high plains.

Because the PRISM data and the Plate 1b data are more closely correlated in the Owl Creek range, the mean annual basin precipitation calculated from the PRISM data was used in the entire basin. Drainage basin characteristics for the Owl Creek basin are shown in Table 5-4.

Table 5-4. Natural Flow Data for the Bighorn River Basin
Sub-
Basin
Site NameLocation Area
(sq.mi.)
Precipitation
(in)
Slope
(ft/mile)
Relief
(ft)
Mean Elev.
(feet)
Upper BighornAdobe Creek - Natural FlowWind6.46.9 1654894,081
Carney Creek Natural FlowWind1.815.21,5123,5437,926
Cottonwood Creek - Natural FlowWind34.817.01,4884,2858,121
Dry Cottonwood Creek - Natural FlowWind5.316.71,2452,3728,435
Enos Creek - Natural FlowWind23.814.41,3782,9046,920
Goat Creek Natural FlowWind3.314.41,3263,5177,462
Gooseberry Creek - Natural FlowWind57.616.91,4264,2557,539
Grass Creek - Natural FlowWind11.614.51,1951,9727,028
Hamilton Dome Well - Natural FlowWind2.711.06007515,668
Kirby Creek Natural FlowWind194.413.27413,5405,143
Lake Creek Natural FlowWind4.515.71,3501,3487,854
Little Grass Creek Natural FlowWind32.216.21,3962,7927,469
Mayfield Wells - Natural FlowWind24.311.51,1721,9166,164
McCumber Spring Natural FlowWind0.512.24043774,771
Middle Fork Mud Creek - Natural FlowWind10.413.91,2313,1506,854
Mud Creek - Natural FlowWind26.614.41,2633,9076,917
Natural Flow NodeWind0.111.983625,554
Natural Flow NodeWind5.110.82015254,806
North Fork Owl Creek - Natural FlowWind17.918.11,7964,4759,106
Red Canyon Creek - Natural FlowWind87.611.78773,3106,005
Red Creek Natural FlowWind14.515.81,3023,8457,717
Sixmile Creek Natural FlowWind6.77.32513944,275
South Fork Mud Creek Natural FlowWind12.913.51,1483,3046,718
Spring Draw Natural FlowWind15.511.57171,5945,473
Unnamed Creek Natural FlowWind2.67.32413444,274
Un-named River - Natural FlowWind6.611.14511,1225,193
Whitney Spring Natural FlowWind3.311.71,1811,2145,896
NowoodBear Creek - Natural FlowWind11.918.31,048 3,1047,053
Beth Wells - Natural FlowWind0.110.94251904,565
Box Elder Creek - Natural FlowWind24.815.91,1773,4686,422
Brokenback Creek - Natural FlowWind17.220.41,2633,9376,862
Buffalo Flat Creek - Natural FlowWind21.314.48521,9395,268
Crooked Creek - Natural FlowWind7.516.79631,9196,142
Deep Creek - Natural FlowWind66.420.91,0633,9667,473
Gomer Well #1- Natural FlowWind0.39.44722724,547
Gomer Well #2- Natural FlowWind0.810.16695384,696
Green Beret Wells - Natural FlowWind24.020.51,1604,7287,089
Hamilton and Walters Wells - Natural FlowWind25.215.29862,5165,568
Little Canyon Creek - Natural FlowWind16.018.61,2712,6386,769
Lone Tree Creek - Natural FlowWind9.515.98292,0516,711
Medicine Lodge Creek - Natural FlowWind45.522.11,2605,9687,727
North Fork Spring Creek - Natural FlowWind6.117.41,0592,2906,016
Nowood River - Natural FlowWind36.416.67551,8576,539
Otter Creek - Natural FlowWind46.420.01,1993,7207,098
Red Bank Creek - Natural FlowWind23.915.81,0323,0486,543
South Fork Little Canyon Creek - Natural FlowWind0.413.55202625,371
South Fork Otter Creek - Natural FlowWind36.519.49163,4876,695
Spring Creek - Natural FlowWind26.319.01,0433,5016,916
Taylor #2 Well - Natural FlowWind0.113.95604305,131
Ten Sleep Creek - Natural FlowWind35.627.21,0453,8129,800
Unnamed Creek Natural FlowWind0.110.9698285 4,561
West Fork Tensleep Creek Natural FlowWind50.529.61,261 4,4239,950
GreybullDick Creek Natural FlowAbsaroka12.120.42,074 3,7148,532
Dorsey Creek Natural FlowAbsaroka23.97.8 4451,2434,397
Dry Creek Natural FlowAbsaroka381.1 10.03832,8155,121
Four Bear Creek - Natural FlowAbsaroka8.622.99784,3188,564
Francs Fork - Natural FlowAbsaroka40.524.32,1346,1099,606
Greybull River - Natural FlowAbsaroka191.924.52,1365,9749,909
Iron Creek - Natural FlowAbsaroka12.914.11,1911,3396,556
Little Rawhide Creek - Natural FlowAbsaroka2.128.61,2902,15210,069
Long Hollow Creek Natural FlowAbsaroka3.614.85558696,694
Meeteetse Creek - Natural FlowAbsaroka13.628.91,7153,24810,057
North Fork Dick Creek Natural FlowAbsaroka3.018.41,3381,8547,892
Pappapau Creek - Natural FlowAbsaroka19.816.48872,7177,007
Pickett Creek - Natural FlowAbsaroka2.820.01,0343,1108,077
Rawhide Creek - Natural FlowAbsaroka4.727.51,4063,2459,937
Roach Gulch Natural FlowAbsaroka1.29.76974175,055
Rock Creek - Natural FlowAbsaroka28.125.61,7565,1389,567
South Fork Meeteetse Creek - Natural FlowAbsaroka6.420.89052,2977,586
Spring Creek - Natural FlowAbsaroka9.119.28234,1607,497
Sunshine Creek Natural FlowAbsaroka10.015.86681,3486,828
Timber Creek - Natural FlowAbsaroka7.223.92,2873,4028,794
Wardell Reservoir Natural FlowAbsaroka0.47.81161024,309
Wilcox Draw - Natural FlowAbsaroka1.614.35395386,415
Willow Creek Natural FlowAbsaroka29.29.77791,7755,009
Big Horn LakeAdelaide Creek Natural FlowBighorn2.830.9878 1,3259,679
Bear Creek - Natural FlowBighorn6.924.41,6884,7677,439
Beaver Creek - Natural FlowBighorn13.929.61,7754,1148,356
Cedar Creek - Natural FlowBighorn2.829.62,0373,2788,479
Crooked Creek Natural FlowBighorn0.37.18104404,273
Crystal Creek - Natural FlowBighorn20.012.38093,4714,722
Fire Spring Creek - Natural FlowBighorn20.521.11,4166,0606,513
Gypsum Creek Natural FlowBighorn0.17.58792394,552
Horse Creek - Natural FlowBighorn13.127.71,8514,9288,445
Red Canyon Natural FlowBighorn15.024.31,6575,2307,537
Roundup/Harmon Spring Natural FlowBighorn0.110.07192794,142
South Fork Beaver Creek - Natural FlowBighorn5.031.61,9153,3668,856
Sykes Spring Natural FlowBighorn0.37.68574794,036
Trapper Creek - Natural FlowBighorn57.122.11,4486,0737,564
White Creek - Natural FlowBighorn26.822.71,3714,3807,914
ShoshoneAldrich Creek - Natural FlowAbsaroka10.327.42,720 5,9159,002
Alkali Creek - Natural FlowAbsaroka10.89.31046174,857
Ashworth Creek - Natural FlowAbsaroka1.318.48481,2736,753
Belknap Creek - Natural FlowAbsaroka9.725.21,6565,1318,328
Big Creek - Natural FlowAbsaroka16.433.12,8955,4499,609
Bitter Creek Natural FlowAbsaroka76.97.71911,0564,524
Black Draw Natural FlowAbsaroka0.67.12671643,956
Bob Cat Creek - Natural FlowAbsaroka13.629.32,6135,6339,298
Boulder Creek - Natural FlowAbsaroka41.726.52,4715,8239,616
Breteche Creek Natural FlowAbsaroka5.321.51,7383,0547,547
Bull Creek - Natural FlowAbsaroka6.823.21,3394,6168,036
Canyon Creek - Natural FlowAbsaroka6.530.32,8985,5778,688
Carter Creek - Natural FlowAbsaroka9.321.91,4674,6757,752
Cottonwood Creek - Natural FlowAbsaroka5.012.69239816,358
Crane Creek - Natural FlowAbsaroka2.222.62,9334,6328,734
Deer Creek - Natural FlowAbsaroka18.833.03,0615,0629,572
Derry Drain Natural FlowAbsaroka16.37.65631,5654,519
Elk Fork Creek Natural FlowAbsaroka107.529.52,6236,1618,859
Green Creek - Natural FlowAbsaroka6.526.82,2885,3158,099
Hard Pan Creek - Natural FlowAbsaroka19.228.32,3755,7589,192
Hunter Creek - Natural FlowAbsaroka0.615.03,2203,1048,471
Ishawooa Creek - Natural FlowAbsaroka65.731.92,7675,6599,166
Jim Creek - Natural FlowAbsaroka5.616.51,6024,5018,068
Jordan Creek - Natural FlowAbsaroka5.120.61,6863,1077,577
Legg Creek - Natural FlowAbsaroka3.127.31,8843,8399,632
Little Sand Draw - Natural FlowAbsaroka4.27.53621,3813,957
Marquette Creek Natural FlowAbsaroka10.019.21,1955,0957,330
North Branch Alkali Creek Natural FlowAbsaroka0.79.01461714,821
North Fork Shoshone River -Natural FlowAbsaroka56.041.62,3285,0499,096
Rand Creek - Natural FlowAbsaroka3.321.81,6013,1367,580
Rattlesnake Creek - Natural FlowAbsaroka3.127.21,7662,2418,431
Rock Creek - Natural FlowAbsaroka24.826.52,0675,8238,733
Sage Creek - Natural FlowAbsaroka6.521.41,1894,6827,474
Sand Creek Natural FlowAbsaroka26.87.23157154,335
SF Shoshone Tributary Natural FlowAbsaroka1.020.32,5502,7998,042
South Fork Sage Creek Natural FlowAbsaroka0.028.42,9348839,883
South Fork Shoshone River - Natural FlowAbsaroka213.930.42,8543,625 10,492
Spring Creek - Natural FlowAbsaroka0.921.13,4583,7118,280
Trail Creek - Natural FlowAbsaroka4.815.81,5772,1957,399
Trout Creek - Natural FlowAbsaroka47.122.81,9076,5398,258
Unnamed Creek Natural FlowAbsaroka1.016.82,2501,5947,018
Whit Creek - Natural FlowAbsaroka10.624.51,2303,8298,015

Section 6 - Hydrologic Year Classification

Once the study period is selected, the monthly data is further reduced into average data for dry, average and wet hydrologic year classifications. To determine which years within the period-of-record fall into which hydrologic year classifications, index gages were selected within each of the hydrologic units. These gages were selected based upon their period-of-record and their lack of influence by diversion and return flows. Then, the hydrologic classification for the index gage was applied to the remaining gages within its influence area. The hydrologic classifications for the Wind/Bighorn River Basin plan are consistent with the hydrologic classifications for the other river basin plans and with the guidelines. A summary of the classification methodology is shown in Table 6-1, while a summary of the hydrologic year classification for each index gage are shown in Table 6-2.

Table 6-1. Hydrologic Classification Methodology

DryAverageWet
Percent of YearsDriest 20 percentMiddle 60 percentWettest 20 percent
Number of Years in 29-year Study Period6176

Table 6-2. Summary of Hydrologic Classifications for Study Area
BasinUSGS
Gage No
Gage ID1970 198019902000
3456789012345678901 2345678901
Mad./Gal.,
Yell., Ck.
Fk.
06037500Madison Near West Yellowstone




























06191500Yellowstone At Corwin Springs




























06205500Clarks Fk Ab Squaw Ck




























Wind 06222700Crow C Nr Tipperary Wyo




























06224000Bull Lake Creek Above Bull Lake




























06228350SF Little Wind Ab Washakie Res




























Bighorn06260000South Fork Owl Ck Near Anchor




























06270000Nowood River Near Tensleep




























06275000Wood River At Sunshine




























06278500Shell Creek Near Shell




























06280300SF Shoshone River Near Valley




























Notes:
(1)Hydrologic Year Classification  - Wet Year (Wettest 20 percent of years)


  - Average (Middle 60 percent of years)


  - Dry Year (Driest 20 percent of years)

6.1 Madison/Gallatin River Basins

Both the Madison River near West Yellowstone gage and the Gallatin River gage contain adequate data to classify hydrologic years. However, since the primary gages that need to be classified in the model are Madison River tributaries, the Madison River near West Yellowstone gage (06037500) has been selected for the analysis. A summary of the annual classifications is shown in Table 6-3.

Table 6-3. Annual Summary of Hydrologic Classification for Madison/Gallatin River Basin
Hyd.
Class
RankExceedance
Probability
Mad_WstY
6037500
Yearac-ft
Dry 197%1992319,163
293%1990319,857
390%1988320,343
487%1989323,876
583%1987325,576
680%2001325,718
Average777%1977334,959
873%1994337,320
970%1991349,560
1067%1980353,507
1163%1973353,846
1260%1979357,054
1357%1983359,521
1453%1981359,964
1550%1985370,089
1647%2000372,904
1743%1993372,938
1840%1975375,209
1937%1978378,618
2033%1984385,759
2130%1982394,155
2227%1976394,727
2323%1995399,487
Wet2420%1974403,342
2517%1986445,688
2613%1999464,538
2710%1998468,532
287%1996485,023
293%1997571,071

6.2 Yellowstone River Basin

There are three gages within the Yellowstone model that would be adequate for hydrological classification: the Yellowstone River at the Yellowstone Lake Outlet (06186500), Gardner River near Mammoth (06190500) and the Yellowstone River at Corwin Springs (06191500). The first two gages, respectively, have short periods where data would need to be filled. In addition, the annual flow variation at the Yellowstone Lake Outlet gage is small and may not provide a good measure of hydrologic variability throughout the entire basin. Therefore, the Corwin Springs gage was selected as the index gage for the entire basin. A summary of the annual classification is shown in Table 6-4.

Table 6-4. Annual Summary of Hydrologic Classification for Yellowstone River Basin
Hyd.
Class
Rank Exceedance
Probability
YI_CSp
6191500
Yearac-ft
Dry197%19881,432,264
293%19771,465,559
390%20011,469,775
487%19871,515,455
583%19941,739,690
680%19801,896,240
Average777%19851,950,495
873%19791,999,467
970%19922,002,359
1067%19732,008,748
1163%19812,025,027
1260%19892,027,794
1357%20002,033,189
1453%19902,165,736
1550%19832,192,144
1647%19912,313,669
1743%19952,402,856
1840%19752,452,548
1937%19782,494,101
2033%19932,516,278
2130%19842,551,455
2227%19982,558,338
2323%19862,646,85
Wet2420%19822,810,473
2517%19992,810,917
2613%19762,835,864
2710%19743,033,936
287%19963,276,792
293%19973,733,984

6.3 Clarks Fork River Basin

Although the Clarks Fork near Belfry gage contains continuous data through the period-of-record, the gage is located downstream of agricultural diversions. These diversions have an influence on the relative flow at the gage making it unsuitable for use as an index gage in the hydrologic year classification. Two other gages within the basin are located upstream of diversions making them more suitable for use as the index gage: the Clarks Fork Yellowstone River above Squaw Creek and Sunlight Creek near Painter. Neither of these gages has any data in the study period. However, since the correlation coefficients used to fill the data were very strong, the filled data should be representative of actual flows at the gage, allowing either to be used as an index gage. Because the Clarks Fork above Squaw Creek gage is on the mainstem and contains a larger portion of flow in the basin, it was selected as an index gage. A summary of the annual classification is shown in Table 6-5.

Table 6-5. Annual Summary of Hydrologic Classification for Clarks Fork River Basin
Hyd.
Class
RankExceedance
Probability
CFk_abSqC
06205500
Yearac-ft
Dry197%1977157,292
293%1988162,139
390%2001168,504
487%1985180,960
583%1987181,061
680%1994191,993
Average777%2000239,216
873%1973241,625
970%1993251,384
1067%1983254,106
1163%1990254,764
1260%1979267,893
1357%1989269,858
1453%1991270,145
1550%1992278,943
1647%1998280,137
1743%1984290,709
1840%1980291,356
1937%1981301,619
2033%1995304,153
2130%1986305,178
2227%1999316,801
2323%1982325,962
Wet2420%1978331,186
2517%1975369,678
2613%1974389,981
2710%1976401,423
287%1996426,084
293%1997472,436

6.4 Wind River Basin

Several gages within the Wind River basin contain adequate data to serve as index gages for development of hydrologic year classifications. As with previous index gage selection, gages that are not significantly influence by diversions, storage or return flows are the most desireable gages. For the Wind River basin, to account for differences in hydrology between sub-basins and location of gages, separate gages were selected for sites along the Wind River range in the Wind River sub-basin and Little Wind River sub-basin, and those located along the Owl Creek range. For purposes of this analysis, the following gages were selected as index gages: Bull Lake Creek above Bull Lake (06224000), South Fork Little Wind River above Washakie Reservoir (06228350) and Crow Creek near Tipperary (06222700). A summary of the annual hydrologic classification for each of these gage is shown in Table 6-6.

Table 6-6. Annual Summary of Hydrologic Classification for Wind River Basin
Hyd.
Class.
RankExceedance
Probability
CrowCk_Tip
06222700
BlCk_abLk
06224000
SFLW_abWRes
06228350
Yearac-ft Yearac-ft Yearac-ft
Dry197%19774,0581977 126,271200143,797
293%19856,2972001128,2951977 51,583
390%19888,7871992132,032 199455,627
487%20019,3651994132,676 198855,774
583%19819,4291988138,843199263,176
680%19949,6781985146,821198573,728
Average777%197310,5602000167,042 198174,239
873%200012,1321979 172,414200074,611
970%199012,2631990172,975197976,579
1067%198412,8401981182,436199078,551
1163%198912,8981989189,216198979,098
1260%197912,9171987193,715198787,230
1357%198713,7831993197,805197689,320
1453%199214,3281976200,758197390,941
1550%197416,3101975204,060198490,941
1647%198016,5851973209,154199394,879
1743%199616,6571984217,294197598,999
1840%199316,9921978224,227198299,475
1937%197617,1771980229,3881974107,407
2033%197517,4411996230,4131996108,325
2130%199817,4681974232,5041980110,291
2227%197817,9501998241,7751991113,234
2323%198318,5191982245,6511978114,02
Wet2420%199718,9911991246,210 1998115,485
2517%198219,1391997263,103 1997122,894
2613%199519,2641995266,9311983126,601
2710%198619,4141999275,2441999133,361
287%199919,8581983286,1641995135,304
293%199120,2511986300,4551986136,312

6.5 Bighorn River Basin

Only a few gages within the Bighorn basin contain adequate data to serve as index gages for development of hydrologic year classifications. As with previous index gage selection, gages that are not significantly influence by diversions, storage or return flows are the most desirable gages. In the Bighorn basin, separate gages were selected for sites along the Owl Creek Range in the Upper Bighorn Basin and Nowood River basins, the Bighorn range in the Nowood River basin, and Bighorn Lake River basin, and the Absaroka range in the Greybull and Shoshone River basins. For purposes of this analysis, the following gages were selected as index gages: the South Fork of Owl Creek near Anchor (0626000), Nowood River near Tensleep (0627000), Wood River at Sunshine (06275000), Shell Creek near Shell (06278500) and the South Fork Shoshone River near Valley (06280300). A summary of the annual hydrologic classification for each of these gages is shown in Table 6-7 and Table 6-8.

Table 6-7. Annual Summary of Hydrologic Classification for Upper Bighorn and Greybull River Basins
Hyd.
Class.
RankExceedance
Probability
SFOwl_nrAnc
06260000
Now_Ten
06270000
Wod_Sun
06275000
Yearac-ft Yearac-ft Yearac-ft
Dry197%20019,057199548,437 197728,027
293%19949,868198949,105198532,102
390%198510,269198052,662198233,013
487%197710,813200154,585198835,164
583%198817,060198154,772198939,662
680%197918,270198258,017199043,147
Average777%200019,366199259,894 200144,959
873%198221,021200062,873198646,732
970%198121,961198563,347198753,210
1067%198422,709199364,093197954,717
1163%199024,177199767,117198060,833
1260%197324,702198767,897199261,179
1357%198924,713197968,090199462,936
1453%199325,955199071,158200065,234
1550%198027,103198871,298197666,657
1647%197628,021197472,017198167,117
1743%198728,305197672,481197868,321
1840%197428,519199172,820198477,764
1937%197830,736199873,166199383,381
2033%198330,938199477,481199187,968
2130%197531,129198678,295197588,650
2227%199232,065199984,286199592,835
2323%199832,7101977104,788199693,989
Wet2420%199633,6901996106,347 198397,824
2517%199735,5671983114,541197399,332
2613%199937,1691975125,2521998100,575
2710%199538,2951973129,0501974108,587
287%198640,3951984136,7521997109,054
293%199140,6651978183,8191999112,350

Table 6-8. Annual Summary of Hydrologic Classificationfor Bighorn Lake and Shoshone River Basins
Hyd.
Class.
RankExceedance
Probability
Shl_nrShl
06278500
SFSh_Val
06280300
Yearac-ft Yearac-ft
Dry197%200155,8481977159,664
293%198566,2672001181,470
390%198970,1311994185,366
487%199470,7581988196,253
583%200071,9471992206,754
680%197772,0031987218,431
Average777%198772,8591979236,390
873%199876,6452000237,314
970%198077,9281973241,555
1067%198186,6101993245,516
1163%198887,0471985249,330
1260%199187,2511990259,033
1357%199388,2141981264,964
1453%199688,2661989275,921
1550%198389,5271980298,057
1647%198291,9261998301,155
1743%199292,4321983309,712
1840%199094,3621975318,943
1937%199794,7461984323,529
2033%197396,0411995326,448
2130%198497,8811991337,143
2227%197499,0421999350,738
2323%197999,0951978352,728
Wet2420%199999,6851976369,709
2517%1986100,4451982376,575
2613%1976100,5631996378,708
2710%1995103,0621986386,116
287%1975109,6731974400,141
293%1978116,7321997440,652

Section 7 - Summary Flow Data

This section presents an annual summary of the overall study period average and hydrologic period averages. As previously discussed, gage records were reduced from monthly data throughout the study period to the hydrologic classifications shown by averaging the data for the years within each hydrologic classification, based upon the classification at the index gage. The natural flow node flows were estimated based on regional regression equations for the Q10, Q50 and Q90 for the wet, dry and average years, respectively. Monthly average flows are presented in Appendix A.

7.1 Madison/Gallatin River Basin

A summary of annual flows for the Madison/Gallatin River Basin are presented in Table 7-1. As shown, because of its heavy influence by groundwater inflows, flows in the Madison river basin do not vary significantly between dry and wet years.

Table 7-1. Summary of Average Annual Flows for the Madison/Gallatin River Basins
Sub-
Basin
USGS
Gage No.
Site NameGaged/Estimated Annual Flow (ac-ft)
DryAverageWet
Madison/Gallatin06037000Gibbon River Near West Yellowstone Mt76,82997,101120,010
06036905Firehole River Near West Yellowstone Mt216,029234,984266,559
06037500Madison River Near West Yellowstone Mt340,745375,009437,417
06043500Gallatin River Near Gallatin Gateway Mt501,921634,324716,471

7.2 Yellowstone River Basin

A summary of streamflow data for the Yellowstone River Basin is shown in Table 7-2. As with the Madison and Gallatin basins, there is not a significant variation between dry, average and wet year flows in the basin. The Lamar River gage, the average annual flow during average years is less than for dry years. This is because the dry, average and wet years were determined at the Yellowstone gage, which is influence more by flows from the Yellowstone River upstream of its confluence with the Lamar River. Because of its different physical setting (originating on the west slope of the Absarokas rather than the north slope of the Absarokas) the distribution of dry, average and wet years are different.

Table 7-2. Summary of Average Annual Flows for the Yellowstone River Basin
Sub-
Basin
USGS
Gage No.
Site Name Gaged/Estimated Annual Flow (ac-ft)
DryAverageWet
Yellowstone
Headwaters
06186500Yellowstone River At Yellowstone Lk Outlet Ynp664,734 1,001,5881,185,711
06187000Yellowstone River Near Canyon Hotel Ynp813,6471,146,5941,328,581
06187500Tower Creek At Tower Falls Ynp27,20043,14551,977
06187915Soda Butte Cr At Park Bndry At Silver Gate27,89241,211---(1)
06187950Soda Butte Cr Nr Lamar Ranger Station Ynp74,928108,886115,585
06188000Lamar River Nr Tower Falls Ranger Station Ynp373,084353,678687,920
06190000Lupine Creek Near Mammoth Ynp2,3623,6944,247
06190500Gardner River At Mammoth Ynp---(1)---(1)---(1)
06190540Hot River At Mammoth Ynp18,96119,41719,776
06191000Gardner River Near Mammoth Ynp116,866160,968179,296
06189000Blacktail Deer Creek Nr Mammoth Ynp4,8957,7959,115
06188500E F Blacktail Deer Cr Nr Mammoth Ynp1,4442,7323,322

Notes:
(1)No data available for hydrologic period. Gage record was not extended for reasons discussed in previous sections. Gage not included in model.

7.3 Clarks Fork River Basin

Average annual flows for the Clarks Fork River Basin are shown in Table 7-3. The Clarks Fork basin shows significant differences between dry and wet years. This is because basin runoff is primarily dependent upon snowpack and because there is no upstream storage in the basin. Several natural flow nodes were required to model the basin; these outnumber gage flows by over three to one. The Clarks Fork above Squaw Creek (06205500) gage represents natural flows for the Clarks Fork River.

Table 7-3. Summary of Average Annual Flows for the Clarks Fork River Basin
Sub-
Basin
USGS
Gage No.
Site NameGaged/Estimated Annual Flow (ac-ft)
DryAverageWet
Clarks Fork
Yellowstone
6205500Clarks Fk Yellowstone R Ab Squaw C Nr Painter,Wy204,675289,994336,440
6206000Clarks Fk Yellowstone R Bl Crandal C Nr Painter355,882506,663589,085
Natural FlowDeadman Creek Natural Flow173390856
Natural FlowCamp Creek Natural Flow2906491,406
Natural FlowDutch Charlie Creek Natural Flow133302669
Natural FlowBars Creek Natural Flow2535681,234
Natural FlowSunlight Creek Natural Flow9,97120,47040,655
Natural FlowGravel Bar Creek Natural Flow1,9204,1228,509
Natural FlowHuff Creek Natural Flow6031,3292,823
6206500Sunlight Creek Near Painter, Wyo.66,58291,038104,272
Natural FlowElk Creek Natural Flow1,9234,1288,522
Natural FlowNew Meyer Creek Natural Flow1,0272,2364,688
Natural FlowPaint Creek Natural Flow1,3062,8295,896
Natural FlowLuce Reservoir Natural Flow160363798
Natural FlowPat O'Hare Creek Natural Flow6,83814,19328,436
Natural FlowBennett Creek Natural Flow2,3104,93710,147
Natural FlowNatural Springs Natural Flow3376176
Natural FlowLittle Rocky Creek Natural Flow9,03818,60837,042
Natural FlowLine Creek Natural Flow2946591,426
6207500Clarks Fork Yellowstone River Nr Belfry Mt496,917681,915782,014
6207510Big Sand Cl At Wy-Mont State Line32,32029,05825,148

Notes:
(1)No data available for hydrologic period. Gage record was not extended for reasons discussed in previous sections. Gage not included in model.

7.4 Wind River Basin

Table 7-4 presents a summary of average annual flows for the Wind River Basin. The basin contains a mixture of gage sites and natural flow nodes. In addition, four creeks within the basin contain gages that represent natural flows for the creek: Crow Creek (6222700), Bull Lake Creek (6224000), South Fork Little Wind (06228350) and North Fork Little Wind (06228350). The Popo Agie gage has been included in the Wind River basin gages. However, the Popo Agie river basin has been modeled under a separate study (Anderson, 2002). As shown and as previously discussed, there are several streamflow gages that were not used in the modeling analysis.

Table 7-4. Summary of Average Annual Flows for the Wind River Basin
Sub-
Basin
USGS
Gage No.
Site NameGaged/Estimated Annual Flow (ac-ft)
DryAverageWet
Upper WindNatural FlowWind River Natural Flow23,78049,72686,258
Natural FlowEast Dunoir Creek Natural Flow11,01422,58439,529
Natural FlowWest Dunoir Creek Natural Flow10,62422,80239,927
Natural FlowWillow Branch Creek Natural Flow9492,4925,065
Natural FlowSixmile Creek Natural Flow3,1517,00713,445
Natural FlowFivemile Creek Natural Flow8442,2334,560
6218500Wind River Near Dubois, Wyo.83,224128,144147,394
Natural FlowWarm Springs Creek Natural Flow26,51653,55891,147
Natural FlowGeyser Creek Natural Flow8972,3194,778
Natural FlowLittle Warms Springs Creek Natural Flow3,1967,58914,352
Natural FlowHorse Creek - Natural Flow8,72017,32732,811
Natural FlowLittle Horse Creek - Natural Flow1,5283,9848,009
6220000Wind River At Dubois Wyo--- (1)--- (1)---(1)
Natural FlowJakeys Fork - Natural Flow23,28042,54472,137
Natural FlowTorrey Creek Natural Flow20,67336,40963,381
Natural FlowEast Fork Wind River Natural Flow16,72631,43355,589
Natural FlowMeadow Creek Natural Flow2,3666,01111,339
Natural FlowAlkali Creek Natural Flow2,4916,60512,396
Natural FlowBear Creek Natural Flow23,90147,96680,871
Natural FlowWiggins Fork Natural Flow54,17794,640160,960
6220500East Fork Wind River Nr Dubois Wyo106,052177,501221,433
6220800Wind River Above Red Creek, Near Dubois, Wy314,982489,170611,810
Natural FlowRed Creeknatural Flow1,9124,6969,383
6221400Dinwoody Creek Above Lakes, Near Burris, Wyo.75,11599,612126,925
6221500Dinwoody Creek Near Burris, Wyo.---(1)---(1)---(1)
6222000Wind River Near Burris, Wy---(1)---(1)---(1)
Natural FlowLittle Dry Creek Natural Flow5,09512,66622,620
Natural FlowDry Creek Natural Flow23,53340,94170,245
6222500Dry Creek Near Burris, Wyo.18,82233,11448,754
6222700Crow C Nr Tipperary Wyo7,93615,10719,486
Natural FlowMeadow Creek Natural Flow1,3033,7097,372
Natural FlowBob Creek Natural Flow4,7419,53118,304
6223000Meadow Creek Nr Lenore Wyo---(1)---(1)---(1)
6223500Willow Creek Near Crowheart, Wyo.7,21613,29022,927
6224000Bull Lake Creek Above Bull Lake, Wy134,156206,519273,018
6225000Bull Lake Creek Near Lenore, Wy161,646194,507232,087
6225500Wind River Near Crowheart, Wy573,394861,0741,066,800
Natural FlowWest Fork Dry Pasup Creek Natural Flow6461,4533,190
Natural FlowRed Creek Natural Flow93182
6227600Wind River Near Kinnear, Wy242,380527,696780,446
6228000Wind River At Riverton, Wy169,632406,669619,260
6236100Wind River Ab Boysen Reservoir, Nr Shoshoni, Wy423,079899,1381,318,331
Little Wind 6228350Sf L Wind R Ab Washakie Re Nr Ft Washakie Wy57,28193,420128,326
6228450South Fork Little Wind Riv Bel Washakie Res, Wy57,38589,827123,268
6228500Little Wind R Nr Fort Washakie, Wyo.---(1)---(1)---(1)
Natural FlowCrooked Creek Natural Flow1,1813,3006,722
Natural FlowSpring Creek Natural Flow2488981,935
6229900Trout Creek Near Fort Washakie, Wy4,7376,90110,415
Natural FlowMill Creek Natural Flow7512,3774,905
6230190Mill Cr Ab Ray Lake Outlet Canal, Nr Ft Washakie2,3703,6635,471
6228800North Fork Little Wind River Nr Fort Washakie, Wy57,57199,885140,330
6229000N Fk Little Wind R At Fort Washakie, Wyo.---(1)---(1)---(1)
Natural FlowNorth Fork Sage Creek Natural Flow1,7464,1758,590
Natural FlowSouth Fork Sage Creek Natural Flow9992,5975,464
Natural FlowPevah Creek Natural Flow4291,2952,814
6229680Sage Cr Ab Norkok Meadows Cr, Nr Ft Washakie, Wy4,3437,83511,732
Natural FlowNorkok Creek Natural Flow7722,2684,624
6230500Little Wind River Nr Arapahoe Wyo---(1)---(1)---(1)
6231000Little Wind R Above Arapahoe, Wyo.61,917137,892219,921
6234000Little Wind River Below Arapahoe Wyo---(1)---(1)--- (1)
Natural FlowBeaver Creek Natural Flow4,57110,27619,485
6235500Little Wind River Near Riverton, Wy201,224399,911641,442
6233900Popo Agie River Nr Arapahoe Wy141,836227,330356,443
Lower Wind Natural FlowFive Mile Creek Natural Flow232636,379
6244500Fivemile C Ab Wyo Ca Nr Pav Wyo3,7873,6085,797
6245000Fivemile Creek Nr Pavillion Wyo---(1)---(1)---(1)
6250000Fivemile Creek Near Riverton, Wy168,760231,478256,404
6253000Fivemile Creek Near Shoshoni, Wy90,773124,041137,263
6239000Muscrat Creek Near Shoshoni, Wy---(1)15,681---(1)
Natural FlowDry Cottonwood Creek Natural Flow1675391,229
Natural FlowIngalls Creek Natural Flow (Spring)2084213
Natural FlowMexican Draw Natural Flow1344721,081
Natural FlowStagner Creek Natural Flow1404891,118
Natural FlowWood Road Canyon Natural Flow77287681
Natural FlowGill Meadows Natural Flow25106269
Natural FlowMorrison Meadows Natural Flow (Spring)41540
Natural FlowMorrison Canyon Natural Flow2307481,662
6258500Dry Cottonwood Creek Near Bonneville, Wy---(1)---(1)--- (1)
Natural FlowHolland Creek Natural Flow2006521,467
Natural FlowWarm Springs Creek Natural Flow1384861,108
Natural FlowBargee Creek Natural Flow7402,1584,519
Natural FlowSagwup Creek Natural Flow2,0335,40310,626
Natural FlowDry Muddy Creek Natural Flow1,0042,3204,949
Natural FlowShotgun Creek Natural Flow2095851,352
Natural FlowMckee Grave Creek Natural Flow2045791,337
Natural FlowWest Fork Sheep Creek Natural Flow2546951,580
Natural FlowEast Fork Sheep Creek Natural Flow142403943
6257500Muddy Creek Near Pavillion, Wyo.---(1)4,172---(1)
6258000Muddy Creek Near Shoshoni, Wyo.13,15218,36118,907
6259000Wind R Bl Boysen Res Wyo766,8701,047,8121,329,777
BadwaterNatural FlowBadwater Creek Natural Flow3,4516,59611,885
6256000Badwater Creek At Lybyer Ranch, Nr Lost Cabin, Wy23,42224,20621,224
6256500Badwater Creek At Lost Cabin Wyo---(1)---(1)---(1)
Natural FlowE-K Creek Natural Flow52159368
Natural FlowAlkali Creek Natural Flow5611,3412,620
6256650Badwater C At Lysite, Wy24,44224,20921,529
Natural FlowEast Bridger Creek Natural Flow51157378
Natural FlowBridger Creek Natural Flow1,2892,7695,279
Natural FlowMeadow Creek Natural Flow2396221,308
Natural FlowLysite Creek Natural Flow6541,5122,991
6256800Bridger Creek Near Lysite, Wyo.15,64616,48914,000
Natural FlowWest Fork Dry Creek Natural Flow138378873
6256900Dry Creek Near Bonneville, Wyo.1,0311,547742
6257000Badwater Creek At Bonneville, Wyo.39,90440,51036,361

Notes:
(1) No data available for hydrologic period. Gage record was not extended for reasons discussed in previous sections. Gage not included in model.

7.5 Bighorn River Basin

Average annual flows for the Bighorn River Basin are shown in Table 7-5. The basin does have a mixture of gaged sites and natural flow nodes. However, especially in the Nowood and Greybull basins, there are a significant number of ungaged sites. Streams that contain gage sites representing natural flow include: South Fork Owl Creek (06260000), Middle Fork Owl Creek (06260200) Paint Rock Creek (06271500), Wood River (06274800) and Shell Creek (06278300). As shown and as previously discussed, there are several streamflow gages that were not used in the modeling analysis.

Table 7-5. Summary of Average Annual Flows for the Bighorn River Basin
Sub-
Basin
USGS
Gage No.
Site Name Gaged/Estimated Annual Flow (ac-ft)
DryAverageWet
Upper BighornNatural FlowRed Canyon Creek Natural Flow4,2429,98818,602
6259500Bighorn River At Thermopolis, Wyo.843,6251,069,4961,392,167
Natural FlowNorth Fork Owl Creek Natural Flow3,6398,41916,001
6262000North Fork Owl Creek Near Anchor, Wy4,9509,93013,756
6262300North Fork Owl Cr Ab Basin Ranch Nr Anchor Wyo5,08210,09213,827
6262500N.F. Owl Creek At Crann Ranch Nr Thermopolis, Wy---(1)---(1)---(1)
6263000North Fork Owl Creek Nr Thermopolis Wyo---(1)---(1)---(1)
6260000South Fork Owl Creek Near Anchor, Wy12,57826,74737,630
6260400South Fork Owl Creek Below Anchor Reservoir, Wy9,01917,49822,880
Natural FlowGoat Creek Natural Flow3021,0092,203
Natural FlowCarney Creek Natural Flow2147241,603
6260500S F Owl Creek Ab Curtis Ranch, Nr Thermopolis, Wy---(1)---(1)---(1)
6261000Sf Owl C A C Rn N Thermopolis Wyo---(1)---(1)---(1)
6261500South Fork Owl Creek Nr Thermopolis Wyo---(1)---(1)---(1)
Natural FlowArapaho Ranch Pumps Natural Flow59202460
Natural FlowDry Cottonwood Creek Natural Flow9422,6215,312
Natural FlowRed Creek Natural Flow1,5674,4098,779
Natural FlowUnnamed Creek Natural Flow4181,2342,607
Natural FlowThompson Reservoir #1 Natural Flow Node4821,3462,792
Natural FlowMiddle Fork Mud Creek Natural Flow7662,3604,890
Natural FlowMud Creek Natural Flow1,9565,51310,867
Natural FlowSouth Fork Mud Creek Natural Flow8462,5625,293
Natural FlowWhitney Spring Natural Flow2267341,612
Natural FlowSpring Draw Natural Flow9052,5295,107
6263500Mud Creek Nr Thermopolis Wyo---(1)---(1)---(1)
Natural FlowMccumber Spring Natural Flow71253581
6264000Owl Creek Near Thermopolis, Wy---(1)---(1)---(1)
6264500Owl Creek Near Lucerne, Wyo.---(1)---(1)---(1)
Natural FlowKirby Creek Natural Flow11,80726,78646,764
6265000Kirby Creek Nr Lucerne Wyo---(1)---(1)---(1)
Natural FlowCottonwood Creek Natural Flow4,62611,46221,605
Natural FlowLake Creek Natural Flow7482,1864,473
6265337Cottonwood C At High Island Rnch Nr Hamilton Dome4,8039,18812,155
Natural FlowHamilton Dome Well Natural Flow2056421,409
Natural FlowLittle Grass Creek Natural Flow3,87110,16619,180
Natural FlowGrass Creek Natural Flow1,1663,3996,829
Natural FlowMayfield Wells Natural Flow1,3633,6127,140
6265500Cottonwood Creek At Winchester Wyo---(1)---(1)---(1)
Natural FlowGooseberry Creek Natural Flow6,66016,75330,848
6265800Gooseberry Creek At Dickie, Wyo.7,19912,66214,795
Natural FlowEnos Creek Natural Flow1,9445,43510,666
6266000Gooseberry Creek Near Grass Creek, Wyo.---(1)---(1)---(1)
6266500Gooseberry Creek Nr Dickie Wyo---(1)---(1)---(1)
6267000Gooseberry Creek At Neiber, Wyo.--- (1)---(1)---(1)
6267400East Fork Nowater Creek Near Colter, Wyo.1,7103,1532,155
6268500Fifteen Mile Creek Near Worland, Wyo.3,5085,8344,708
Natural FlowUnnamed Creek Natural Flow144385814
6268600Bighorn R At Worland Wyo614,170840,6921,164,292
Natural FlowSixmile Creek Natural Flow3759071,778
6269000Bighorn River Near Manderson, Wy---(1)---(1)---(1)
6269500Bighorn R At Manderson Wyo---(1)---(1)---(1)
Natural FlowAdobe Creek Natural Flow2906791,358
6274300Bighorn R At Basin Wy963,3401,327,1281,757,979
Nowood Natural FlowNowood River Natural Flow4,97113,48224,793
Natural FlowLone Tree Creek Natural Flow1,1703,6217,196
Natural FlowBear Creek Natural Flow1,8665,81011,088
Natural FlowDeep Creek Natural Flow13,61334,61959,756
Natural FlowBox Elder Creek Natural Flow2,2926,90213,245
Natural FlowRed Bank Creek Natural Flow2,3426,90013,255
Natural FlowLittle Canyon Creek Natural Flow2,6158,06215,042
Natural FlowSouth Fork Little Canyon Creek Natural Flow96333747
Natural FlowCrooked Creek Natural Flow1,0123,3806,673
Natural FlowOtter Creek Natural Flow8,21122,58039,807
Natural FlowSouth Fork Otter Creek Natural Flow5,80116,90630,299
Natural FlowSpring Creek Natural Flow4,14312,21422,322
Natural FlowTaylor #2 Well Natural Flow2080197
Natural FlowNorth Fork Spring Creek Natural Flow8473,0165,959
6270000Nowood River Near Tensleep, Wy52,47672,981132,627
Natural FlowTen Sleep Creek Natural Flow29,21155,33689,030
Natural FlowWest Fork Tensleep Creek Natural Flow53,24394,509145,753
6270450Canyon Creek Below Cooks Canyon, Near Tensleep,9,7549,90110,876
6270500Canyon Creek Nr Ten Sleep Wyo18,27120,41826,662
6271000Tensleep Creek Near Tensleep, Wyo.85,66887,52299,890
Natural FlowBeth Wells Natural Flow2281198
Natural FlowUnnamed Creek Natural Flow1245115
Natural FlowBrokenback Creek Natural Flow3,16310,08718,330
Natural FlowGreen Beret Wells Natural Flow4,33413,11223,576
Natural FlowBuffalo Flat Creek Natural Flow1,8395,50310,626
Natural FlowGomer Well #1 Natural Flow2898238
Natural FlowGomer Well #2 Natural Flow58198465
Natural FlowMedicine Lodge Creek Natural Flow10,57827,74047,733
6273000Medicine Lodge Creek Near Hyattville, Wyo.21,69822,22125,826
6271500Paintrock Creek Below Lake Solitude, Wy---(1)---(1)---(1)
6272500Paintrock Creek Near Hyattville, Wyo.85,64194,079110,948
Natural FlowHamilton And Walters Wells Natural Flow2,2136,72012,844
6273500Paintrock Creek Near Mouth Below Hyattville Wy---(1)---(1)---(1)
6274000Nowood River At Bonanza Wyo---(1)---(1)---(1)
Big Horn Lake 6278300Shell Creek Above Shell Creek Reservoir, Wyo.18,10223,91528,518
Natural FlowAdelaide Creek Natural Flow1,2662,7307,809
6278500Shell Creek Near Shell, Wy68,27789,404105,027
Natural FlowWhite Creek Natural Flow6,14112,42732,556
Natural FlowTrapper Creek Natural Flow11,83723,75565,450
Natural FlowHorse Creek Natural Flow4,2919,06127,136
6279000Shell Creek At Shell Wyo---(1)---(1)---(1)
Natural FlowBeaver Creek Natural Flow5,06010,82935,295
Natural FlowSouth Fork Beaver Creek Natural Flow2,2474,87515,324
Natural FlowCedar Creek Natural Flow1,1832,5276,880
Natural FlowRed Canyon Natural Flow3,9718,15721,497
Natural FlowBear Creek Natural Flow1,9664,0459,894
Natural FlowCrystal Creek Natural Flow2,7085,0459,776
6279500Bighorn River At Kane, Wy982,5681,650,4631,982,999
Natural FlowFire Spring Creek Natural Flow4,3838,75320,999
Natural FlowCrooked Creek Natural Flow59116163
Natural FlowGypsum Creek Natural Flow193949
6286258Big Coulee Near Lovell, Wyo.388289
6286260Crooked C Nr Lovell Wyo6,8137,4177,981
Natural FlowSykes Spring Natural Flow5098135
Natural FlowRoundup/Harmon Spring Natural Flow326383
Shoshone Natural FlowSouth Fork Shoshone River Natural Flow63,887123,306234,780
Natural FlowDeer Creek Natural Flow3,2726,93014,126
Natural FlowHunter Creek Natural Flow50115261
Natural FlowSf Shoshone Tributary Natural Flow92211471
Natural FlowLegg Creek Natural Flow3678181,761
Natural FlowBoulder Creek Natural Flow8,58617,70435,283
6280300South Fork Shoshone River Near Valley, Wy190,964290,432391,984
Natural FlowSpring Creek Natural Flow85195437
Natural FlowCrane Creek Natural Flow2445481,191
Natural FlowAldrich Creek Natural Flow1,5753,3977,047
Natural FlowIshawooa Creek Natural Flow14,96230,34059,701
Natural FlowBob Cat Creek Natural Flow2,1964,6989,668
Natural FlowHard Pan Creek Natural Flow3,3427,07414,411
Natural FlowRock Creek Natural Flow4,5749,60119,416
Natural FlowJordan Creek Natural Flow6731,4813,137
Natural FlowBelknap Creek Natural Flow1,4643,1636,574
6280500South Fork Shoshone River Nr Ishawooa Wyo---(1)---(1)---(1)
Natural FlowBull Creek Natural Flow9632,1024,413
6281000South Fork Shoshone R Ab Buffalo Bill Res, Wy135,796254,070387,997
Natural FlowMarquette Creek Natural Flow1,5203,2826,815
Natural FlowCarter Creek Natural Flow1,4013,0316,305
6281400Diamond Creek Nr Mouth Nr Cody Wy4,0654,4464,932
Natural FlowNorth Fork Shoshone River Natural Flow12,29825,08849,588
6279790Jones Creek At Mouth, Near Pahaska, Wy31,83040,55050,475
6279795Crow Creek At Mouth, At Pahaska, Wy13,93220,42527,331
6279800North Fork Shoshone River At Pahaska, Wy143,475197,216267,152
6279850Middle Cr At E Entrance Ynp Wy26,25643,66664,907
Natural FlowElk Fork Creek Natural Flow27,34854,385105,556
Natural FlowCanyon Creek Natural Flow9051,9774,158
Natural FlowBig Creek Natural Flow2,7665,88312,039
Natural FlowGreen Creek Natural Flow9121,9934,190
Natural FlowRand Creek Natural Flow3998861,904
Natural FlowWhit Creek Natural Flow1,6413,5377,330
6279940North Fork Shoshone River At Wapiti, Wy414,717606,805849,719
Natural FlowJim Creek Natural Flow7511,6483,482
Natural FlowBreteche Creek Natural Flow7091,5573,294
Natural FlowUnnamed Creek Natural Flow94214478
Natural FlowTrout Creek Natural Flow9,95020,42940,577
6280000North Fork Shoshone River Nr Wapiti Wyo389,849610,251826,179
Natural FlowRattlesnake Creek Natural Flow3768361,798
Natural FlowTrail Creek Natural Flow6261,3782,926
6282000Shoshone River Below Buffalo Bill Reservoir, Wy486,134681,7521,020,454
Natural FlowCottonwood Creek Natural Flow6591,4503,074
Natural FlowAshworth Creek Natural Flow128291645
Natural FlowSage Creek Natural Flow8991,9644,131
Natural FlowSouth Fork Sage Creek Natural Flow3616
6283000Shoshone River At Corbett Dam Wyo---(1)---(1)---(1)
6283800Shoshone R Ab Willwood Dam Nr Willwood Wy311,587461,383727,848
6284000Shoshone River At Willwood Dam Wyo---(1)---(1)---(1)
Natural FlowAlkali Creek Natural Flow1,6783,6137,483
Natural FlowNorth Branch Alkali Creek Natural Flow64148334
6284200Shoshone River At Willwood, Wy357,226555,936910,934
Natural FlowDerry Drain Natural Flow2,7445,83811,950
6284400Shoshone River Near Garland, Wy248,171422,417751,324
Natural FlowBitter Creek Natural Flow18,13236,54571,596
6284500Bitter Creek Near Garland, Wy94,667100,136109,307
6284800Whistle Creek Near Garland, Wy13,83118,46918,659
6285000Shoshone River At Byron, Wyo.---(1)---(1)---(1)
Natural FlowSand Creek Natural Flow5,02010,51121,210
6285100Shoshone River Near Lovell, Wy374,488608,010981,613
6286000Shoshone River At Lovell Wyo---(1)---(1)---(1)
6285400Sage Creek At Sidon Canal, Near Deaver, Wy40,52047,25547,112
6285500Sage Creek Near Lovell, Wy---(1)---(1)---(1)
Natural FlowBlack Draw Natural Flow56128291
6286200Shoshone River At Kane, Wy501,521751,1101,139,733
Natural FlowLittle Sand Draw - Natural Flow5341,1812,517
Greybull Natural FlowGreybull River Natural Flow55,880108,384206,993
Natural FlowFour Bear Creek Natural Flow3277291,574
Natural FlowFrancs Fork Natural Flow8,28717,10634,119
6274500Greybull River Near Pitchfork, Wyo.87,088121,314161,480
Natural FlowFour Bear Creek Natural Flow1,2762,7655,766
Natural FlowTimber Creek Natural Flow1,0242,2314,677
Natural FlowPappapau Creek Natural Flow3,4707,33814,937
Natural FlowWilcox Draw Natural Flow173392860
Natural FlowSunshine Creek Natural Flow1,5293,3006,850
6274800Wood River Near Kirwin, Wyo.7,4299,61211,776
6274810Wood R At Kirwin Wyo5,65910,08816,058
Natural FlowDick Creek Natural Flow1,9174,1168,497
Natural FlowNorth Fork Dick Creek Natural Flow3567921,706
6275000Wood River At Sunshine, Wyo.35,18669,353104,620
6275500Wood River Near Meeteetse, Wyo.68,86587,564109,508
Natural FlowRawhide Creek Natural Flow6191,3632,895
Natural FlowLittle Rawhide Creek Natural Flow2355271,148
6276000Greybull River Nr Meeteetse Wyo---(1)---(1)---(1)
Natural FlowIron Creek Natural Flow2,0704,4349,138
6276500Greybull River At Meeteetse, Wyo.166,072222,106287,865
Natural FlowSpring Creek Natural Flow1,3622,9476,136
Natural FloMeeteetse Creek Natural Flow2,2084,7239,717
Natural FlowSouth Fork Meeteetse Creek Natural Flow8911,9484,099
Natural FlowLong Hollow Creek Natural Flow4499962,132
Natural FloRoach Gulch Natural Flow123279617
Natural FlowWillow Creek Natural Flow5,57211,63323,418
Natural FlowWardell Reservoir Natural Flow3172166
6277500Greybull River Near Basin, Wyo.103,866131,342165,141
Natural FlowDorsey Creek Natural Flow4,3729,18818,600
Natural FlowDry Creek Natural Flow130,830245,629460,155
6277950Dry Creek Near Greybull Wy---(1)21,437---(1)
6278000Dry Creek At Greybull, Wy14,63817,64918,735

Notes:
(1)No data available for hydrologic period. Gage record was not extended for reasons discussed in previous sections. Gage not included in model.

Section 8 - References

Daly, Chris and George Taylor. 1997. .Wyoming Average Annual Precipitation, 1961-1990.. PRISM Services/Oregon State University. GIS Coverage.

Lowham, H.W. 1988. Streamflows in Wyoming. USGS Water-Resources Investigations Report 88-4045.

Miselis, Daiva V. 1999. Development of Improved Hyrologic Models for Estimating Streamflow Characteristics of the Mountainous Basins in Wyoming. Thesis submitted to the Department of Renewable Resources and The Graduate School of the University of Wyoming. Laramie, Wyoming. May.

Petras, Ivan. 2000. .Arcview 2.1 Basin Extension.. Downloaded from www.esri.com. April 11.

Rankl, James G., Ellen Montague and Bernard N. Lenz. Estimates of Monthly Streamflow Characteristics at Selected Sites, Wind River and Part of Bighorn River Drainage Basins, Wyoming. USGS Water-Resources Investigations Report 94-4014. Cheyenne.

States West Water Resources Corporation. 2001. Guidelines for Development of Basin Plans. Prepared for the Wyoming Water Development Commission, State of Wyoming Water Basin Planning Process. February.

United States Geological Survey (USGS). 2002.


Appendix A
Streamflow Gage Data Record Extension


Appendix B
Study Period Monthly Streamflow


Appendix C
Hydrologic Classification Monthly Streamflow