Powder/Tongue River Basin Water Plan
Technical Memoranda

SUBJECT:	Appendix C Irrigated Lands Mapping and Water Rights Data
PREPARED BY:	HKM Engineering Inc. and Lord Consulting, LLC
DATE:	February 2002

INTRODUCTION

Irrigated agriculture represents, by far, the greatest consumption of water within the boundaries of the Powder/Tongue River Basin Plan area. An accurate estimate of existing irrigation water use is therefore central to a comprehensive water use inventory. Estimates of water use by irrigated agriculture can generally be divided into the following three components:

1. Quantity of irrigated lands
2. Types of crops grown and geographic distribution
3. Amount of water consumed by the crops

This memorandum summarizes the methodology used to map the existing irrigated lands. The methodology used to determine the types of crops grown and their geographic distribution is summarized in the memorandum "Irrigated Crops". The methodology used to determine the amount of water consumed by the irrigated lands is summarized in the memorandum "Agricultural Water Use".

AERIAL PHOTOGRAPHY INTERPRETATION AND MAPPING

HKM obtained 1994 to 1996 National Aerial Photography Program (NAPP), 1:40,000 scale, black and white imagery as the primary basis for the mapping of irrigated lands. Larger scale photography (1:20,000) was obtained for the Tongue River basin due to the higher density of irrigation in this basin. The 1:20,000 imagery was manually dodged (refinement of tonal patterns) for increased interpretive clarity. A total of approximately 1,150 images were acquired for the planning area. Highly transparent single matte Mylar was used for mapping directly over the aerial photographs. Mapping was performed by viewing the imagery 3-dimensionally, using a Lietz MS-27 three-power track stereoscope.

All man induced irrigation or subirrigation was delineated. Natural subirrigated fields were not delineated unless some benefit was being received from a man made system. Irrigated lands were divided into the following categories based on visual interpretations of the quality of the irrigation, types of crops supported, and the type and condition of the irrigation delivery systems and on-farm systems used to serve these lands:

A - Full service irrigation (typically receives a full water supply);
B - Partial service irrigation (typically receives a reduced water supply due to limited water availability or the inability to provide complete field coverage);
C - Man induced subirrigation (beneficial use resulting from incidental irrigation such as ditch seepage to areas below a canal);
E - Idle irrigation (lands not currently receiving water, typically due to nonfunctional delivery facilities);
S - Spreader dike irrigation (dikes constructed across ephemeral streams to spread infrequent flows over the land to increase beneficial use);
H - Minor beneficial use, (lands that receive some beneficial use on occasion such as lands served by "kick-out" ditches on ephemeral streams).
AD, BD, and ED . A, B, or E lands that have underwent or are currently undergoing residential development.

The mapped information including the irrigated land boundaries and irrigation facilities was projected from the aerial photographs to Mylar transparency overlays on USGS 7.5' quadrangle maps using a Bausch and Lomb zoom transfer scope. This process utilizes triangulation rectification to eliminate all scale differences, tilt, tip, and topographically misplaced information to ensure proper geo-location. This rectification step provided a positional accuracy of 25' or less which exceeds the national map accuracy standard of 40' specified for this study. The various mapped features were color-coded with canals and ditches mapped in blue, irrigated fields in red, and roads and other cultural changes affecting irrigation boundaries in black.

The 1:24,000 scale, positionally rectified, mapping of irrigation polygons (isolated tracts of irrigation) were digitized into AutoCAD files which were subsequently converted to ArcView shape files. Where A, B, and/or C lands were joined contiguously, the lands were digitized as a single polygon of irrigation with an attribute to reflect the multiple classifications (i.e. AB, AC, or ABC). A very minor amount of non- irrigated land such as minor roads and cultural features is included in the mapping of irrigated lands. Farm lanes and field roads with corridor widths of less than 40 feet are generally included in the polygons of irrigation, as they are considered to be insignificant to the overall extent of irrigation. Roads with defined borrow pits and fenced right-of-ways were generally eliminated. For those polygons of irrigation given an AD, BD or ED designation, essentially all roads and residences are included in the boundaries of the respective polygons. Quality control was performed for every polygon on every mapped quadrangle to ensure accuracy and completeness. To ensure proper registration, the four corners of every PLS section containing irrigated lands on the 1:24,000 scale work maps were calibrated to the same four sections in the digital PLS. The digitized polygons for every mapped quadrangle were plotted on vellum "proof maps". The "proof maps" were superimposed over the original work maps to check for completeness and line quality of the digitized polygons.

The extent of irrigated land within the planning area is shown on Figures 1 through 4. A typical area of irrigated lands mapping is illustrated on Figure 5 at a 1:24,000 scale.

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OTHER IMAGERY AND INFORMATION USED TO CROSS-CHECK MAPPING

HKM also obtained the 1983 Color Infrared (CIR), 1:24000 aerial imagery available from WWDC. This photography was very valuable for the purpose of viewing the lands in another "snapshot" in time to confirm the mapping. This information is unfortunately not available for the entire study area nor is it available stereoscopically.

WWDC also made available contact print CIR photography dated 1979 for the Tongue River basin, which was also very helpful in confirming the mapping. This imagery was of very good quality but similar to the 1983 CIRs, was not available stereoscopically.

HKM also utilized the Tabulation of Adjudication Surface Water Rights of the State of Wyoming (SEO, 1999), ditch plat maps obtained from the State Engineers Office, and a listing of irrigation wells within the study area, to double-check areas of prospective irrigation.

The water rights attribution task, to be discussed in a later section, provided another opportunity for review of the thoroughness and completeness of the irrigated lands mapping.

DIGITAL BASE MAPS

HKM obtained approximately 150 7.5-minute vectorized digital base maps developed from USGS quadrangle maps. This information is intended to serve as base maps providing perspective in the areas of irrigation. These digital base maps were obtained from Geographic Information Systems in McAllen, Texas in the form of AutoCAD files. The extent of the digital base map coverage for the Powder/Tongue River Basin is shown on Figure 6. HKM also digitized portions of several additional quadrangles, which had only a very minor amount of irrigation. All of the various quadrangle maps and portions of quadrangle maps were joined together and then separated into the following ArcView data themes:

• Roads (Federal Highways, Light Duty Roads, Medium Duty Roads, Railroads, State Highways, etc.),
• Cultural features (Pipelines, Power Transmission Lines, Airports, Fences, Buildings, etc.),
• PLS (Section Lines, Park Boundaries, etc.),
• Tree boundaries,
• Streams,
• Water Bodies, and
• Text Labeling.

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FIELD VERIFICATION

After the irrigated lands had been identified on the aerial photos, and before being digitized, a field reconnaissance was made in the Tongue River and Powder River basins. Some slight modifications were made to the mapping primarily associated with changes in the method of irrigation rather than the extent of irrigation. The method of irrigation has in some cases changed from gravity irrigation to sprinkler irrigation in the intervening years between 1994/1996 and present. Residential expansion has also resulted in some change in the intervening years but those changes typically fell within areas already characterized as undergoing residential development (AD, BD, or ED).

Following the digitizing process, maps of the irrigated lands were submitted to the State Engineers Office Division 2 Superintendent in Sheridan for review. No significant changes to the mapping arose from this review.

WATER RIGHTS ATTRIBUTION

Purpose

The water rights attribution task entails identifying and describing the water rights attached to the irrigated lands polygons. This task is included in the river basin planning process for two reasons. First, knowing the water rights attached to the polygons provides additional understanding of the source of supply and the irrigation systems that deliver water to the polygons. This increased understanding contributes to the accuracy and reliability of the service area designations used to group lands by source of supply.

The second reason for the water right attribution task is to define the water resources of the basin. A description of irrigated lands is not complete unless it includes a definition of the water rights granted to allow for irrigation of those lands.

The water right attribution process involves three steps: 1) land description development; 2) water right identification; and, 3) water right attribution. Each of these steps is discussed below. The product of the water right attribution process is a water rights database that includes identified water rights and their attributes. This database, when linked to the irrigated lands polygons through the Geographic Information System (GIS), allows the user to identify the water rights attached to the polygons of irrigated land.

Step 1: Land Description Development

The first step in the process is to describe the polygons in a format compatible with water rights records maintained by the Wyoming State Engineer and the State Board of Control. This step involves converting the polygons, which are mapped on USGS quadrangle maps having a scale of 1:24,000, to a land description based on the Public Land Survey System (PLSS). This visual conversion resulted in a land description of each polygon to the nearest quarter-quarter of a Section, or to the nearest lot or tract in the case of a resurveyed Township.

Step 2: Water Right Identification

Given the land description of a polygon, the township plats in the office of the Wyoming State Engineer and the State Board of Control were used to identify the water rights attached to that polygon. These township plats describe the water rights attached to each quarter-quarter, lot, and tract on the plat. There are two different township plats: 1) "linen" plats describe water rights that have been adjudicated by the State Board of Control; and 2) "paper" plats describe all water rights and therefore provide information on the unadjudicated water rights. On the linen plats water rights are identified by Proof Number with a reference to the Order Record Book and Page numbers where all attribute information on that water right is entered at the time the right is adjudicated. Water rights are identified on the paper plats by Temporary File Number or Permit Number. In the event the township plats revealed no water rights for the lands occupied by the polygon, the polygon was assigned a water right number of 0 (zero).

Within the scope of river basin planning, the township plats are the only means available to identify water rights attached to a particular parcel of irrigated land. Legibility and consistency of presentation are issues with these plats, most of which date back to territorial days.

As stated above, land descriptions for unadjudicated water rights are presented on the paper plats. One issue with these paper plats is that when a water right becomes adjudicated, notification of this action is not consistently made on the paper plats and the same right can be identified twice for the same parcel of land, once as unadjudicated and again as adjudicated. Further, there is no indication if the State Board of Control adjudicated all of the right, or if a portion of the lands under the right remain unadjudicated. In these instances the assumption was made that the portion of the right that had not been adjudicated had been eliminated from the water right by the Board of Control.

The process of identifying water rights from the township plats can result in the assignment of water rights to a polygon that does not receive water under those water rights. This situation occurs when multiple ditches irrigate land in one quarter-quarter, lot, or tract. For example, if the Jones Ditch irrigates 10 acres in the NE¼ SE¼ of Section 22, and the Smith Ditch irrigates 15 acres in the same quarter- quarter, then the Jones Ditch and Smith Ditch water rights will be assigned to all polygons that include the NE¼ SE¼ of Section 22 in their land description, whereas in fact one polygon may be served by the Jones Ditch and another by the Smith Ditch. Resolution of this issue is beyond the scope of river basin planning.

A second issue resulting from this identification process is the listing of a water right to a polygon multiple times, i.e. the Frank Ditch could be listed multiple times for polygon #2304. This occurs in the case of adjudicated water rights that are presented on the linen plats by Proof Number rather than by individual water right. Water rights can be adjudicated under multiple Proof Numbers. This issue of multiple listing of water rights is exacerbated by the convention of assigning right numbers to water rights according to the township plat from which they were identified. If a water right also appears on an adjacent plat, or plats, then that water right will have a unique right number for each township plat on which it appears. For example, Right Number 5283006 is the sixth right identified from the township plat for Township 52 North, Range 83 West. If this water right also appears on the plat for Township 52 North, Range 82 West, then it could have Right Number 5282115 and both of the right numbers will be listed for a single polygon.

Groundwater rights attached to the irrigated lands polygons were identified from two sources, the township plats and the computer water right database maintained by the Wyoming State Engineer's Office. The method used to identify groundwater rights from the township plats was the same as used to identify surface water rights. However, only adjudicated rights can be identified from township plats. For unadjudicated groundwater rights it was necessary to use the water right database that provides land descriptions for the land appropriated under the groundwater permit. Land descriptions acquired from the database are compared to the land descriptions developed for the polygons to identify water rights attached to the polygons. These water rights were identified by permit number.

An alternative to using the computer database for groundwater identification is to use the County Groundwater Books on file in the State Engineer's Office. These books contain information on all well permits within a county, but they do not identify the lands irrigated by the wells. Consequently, these books can only be used to identify wells with irrigation use, then it is necessary to determine the lands irrigated by the well from the permit books. This two-step process using both the County Groundwater Books and the permit books was not necessary since the information in the County Groundwater Books is extracted directly from the computer database and the database is, in fact, more current than the County Groundwater Books.

Step 3: Water Right Attribution

After the water rights attached to the irrigated lands polygons had been identified, the next step in the process was to define the attributes of those water rights. The following is a list of the attributes acquired for each of the water rights:

1. Permit Number
2. Facility Name
3. Source of Supply (Surface water only)
4. Priority Date
5. Supply Type (Original, Supplemental, Secondary, or Additional)
6. Status (Adjudicated or Unadjudicated)
7. Permitted Acres
8. Permitted Amount
9. Use

Some of the adjudicated water rights were not found in the computer database, and the database did not include all of the attributes for some of the rights. For these rights the attributes were extracted from the Order Record Books filed in the vault in the office of the State Board of Control. Attributes obtained from the Order Record Books were also proofed against the Tab Books.

For unadjudicated surface water rights, the Permit Number or Temporary File Number were used to query the computer database to extract the attributes. Attributes of water rights not found in the database, or specific attributes missing from the database were collected from the permit books, entry record books, and permit applications.

The point of diversion and means of conveyance of some of the ditches, or portions of some of the ditches, have been changed, through procedures adopted by the State Engineer and the State Board of Control, to other ditches. In these instances the facility name attribute includes the name of the original ditch followed by the receiving ditch in parentheses. For example, if the point of diversion and means of conveyance for all or a portion of the lands irrigated under the Jones Ditch have been changed to the Smith Ditch, the facility name for this right would be written as Jones (Smith). The word "ditch" is omitted from but implied in the facility name unless otherwise specified. No quantification was made of the extent of the change, i.e. how many of the acres were changed and how many were not.

Attributes for adjudicated groundwater rights were obtained from the computer database and proofed against the Tab Books. Some of the adjudicated groundwater rights were not found in the computer database, and the database did not include all of the attributes for some of the rights. For these rights the attributes were extracted from the Order Record Books filed in the vault in the office of the State Board of Control. Attributes obtained from the Order Record Books were also proofed against the Tab Books.

For unadjudicated groundwater rights, the Permit Number or Temporary File Number were used to query the computer database to extract the attributes. Attributes of water rights not found in the database, or specific attributes missing from the database were collected from the permit books, entry record books, and permit applications.

GIS IRRIGATION DATA THEMES

The final work products from the irrigated lands mapping task include the following primary GIS data themes:

Irrigated Lands
Points of Diversion

Water Rights
Water Rights to Polygons to Points of Diversion Associations

This data structure allows the information to be used in a number of ways including the following:

By selecting a Point of Diversion in the GIS, all associated Irrigated Land Polygons in the service area are selected as well as all Water Rights associated with these polygons.

By selecting an Irrigated Land Polygon in the GIS, the particular Point of Diversion for this polygon is selected as well as all of the Water Rights associated with this polygon.

By selecting a record in the Water Rights database table, the Point of Diversion associated with this water right is selected as well as any Irrigated Land Polygons attached to this water right.

The USGS quadrangle and Hydrologic Unit Code (HUC 4) basin boundary are also designated for each irrigated land polygon. Therefore the USGS Quadrangle or HUC 4 basin can be similarly used to select all associated Points of Diversion and/or Water Rights and/or Irrigated Land Polygons.

Other GIS data themes developed for this project related to irrigated lands are listed as follows:

Agricultural wells
Storage Reservoirs

Irrigated Lands (GIS polygon shape file, PTIrr_utm27.shp and PTIrr_dd27.shp)

PolyId	Polygon identification number. Used to link to "PolyId" in PTIrrServ.dbf
Irrtype	Irrigation classification (A, B, C, E, S, H, AB, AC, ABC, AD, BD, ED)
Classfctn	Description of irrigation classifications as described earlier in this memorandum
Acreage	Area of polygon in acres
GW_Supply	Polygon primarily served by ground water (Yes, No)
HUC_Number	Hydrologic Unit Code (HUC) level 4 number
Reg_Name	HUC region name
Sub_Name	HUC subregion name
Acc_Name	HUC accounting name
Cat_Name	HUC cataloging name
MjrBasin	Major river system name (e.g. Tongue River)
USGS_Qd_ID	USGS 7.5" quadrangle index number
Quad_Name	USGS 7.5" quadrangle name
HKM_ID	HKM quadrangle index number
Dgtl_Base	USGS 7.5" quadrangle digital base (Yes, No)

Points of Diversion (GIS point shape file, PTPODs_utm27.dbf and PTPODs_dd27.dbf)

ServAreaId	Point of diversion identification number. Used to link to "ServAreaId" in PTIrrServ.dbf
Ditch	Name of ditch as it appears on the USGS 7.5" quadrangle maps
Div_Node	Diversion node number used in water availability model
Return1	Designation of 1st return node used in water availability model
Return2	" " 2nd " "
Return3	" " 3rd " "
Return4	" " 4th " "
Ret1Perc	Percent of total returning to return node 1 in model
Ret2Perc	" " return node 2 " "
Ret3Perc	" " return node 3 " "
Ret4Perc	" " return node 4 " "
Station1	Climatic station 1 used to estimate crop water requirements
Station2	" " 2 " "
Stat1Perc	Percent weighting applied to climatic station 1
Stat2Perc	" " 2
Alfalfa	Percentage of total acreage in alfalfa
Grain	" " grain crops
Corn	" " corn
Grass	" " pasture grass or grass hay
Effpat	Monthly irrigation efficiency pattern number
Lagpat	Monthly return flow lag pattern number
ModelName	Name of the water availability model
ClimArea	Climate area name
Note	Special notes pertaining to the point of diversion (service area)
HUC_Number	Hydrologic Unit Code (HUC) level 4 number
Reg_Name	HUC region name
Sub_Name	HUC subregion name
Acc_Name	HUC accounting name
Cat_Name	HUC cataloging name
MjrBasin	Major river system name (e.g. Tongue River)
USGS_Qd_ID	USGS 7.5" quadrangle index number
Quad_Name	USGS 7.5" quadrangle name
HKM_ID	HKM quadrangle index number
Dgtl_Base	USGS 7.5" quadrangle digital base (Yes, No)

Water Rights (Tabular database, PTIrrRights.dbf)

RightNo	Identification number for water right. Used to link to "RightNo" field in PTIrrServ.dbf
PerPfx	Permit prefix
PerNo	Permit number (numerical portion only)
PerSfx	Permit suffix
Permit_No	Permit number (prefix, numeric portion, and suffix)
Source	Source of surface water supply
Facility_N	Facility name
Priority	Priority date
Amount	Permitted diversion amount
Units	Permitted diversion amount units (gpm, cfs)
Acres	Permitted number of acres
Suptyp	Supply type (original, supplemental, secondary, or additional)
Status	Status (adjudicated or unadjudicated)
Use	Type of use

Water rights to Polygons to Points of Diversion Associations (Tabular database, PTIrrServ.dbf)

RightNo	Used to link to "RightNo" field in PTIrrRights.dbf
PolyId	Used to link to "PolyId" field in PTIrr_utm27.shp or PTIrr_dd27.shp
ServAreaId	Used to link to "ServAreaId" field in PTPODs_utm27.shp or PTPODs_dd27.shp
HKM_ID	HKM quadrangle index number

Agricultural Wells (GIS point shape file, PTAgWells_utm27.shp and PTAgWells_dd27.shp)

The agricultural well data theme and all other wells data themes developed for this project are based on information contained in the Wyoming State Engineers Office (SEO) ground water database dated December 2000. SEO personnel queried the database for all agricultural wells with a capacity greater than 50 gallons per minute (gpm) and provided HKM with the results. This tabular database was converted to a GIS point data theme with each well being represented by a point positioned at the center of the quarter- quarter section listed in the database. The data fields are described as follows:

Id	Identification number for well
Tns	Township number
Rng	Range number
Sec	Section number
Qtr_Qtr	Quarter-quarter designation
Lots	Lot number
Survey_Cod	Resurvey code
PermitNo	Permit number
Status	Permit status
Use_	Type of use
Applicant	Name of permit applicant
Facility_N	Facility name
Priority	Priority date
Completion	Completion date
Yield_Max_	Maximum yield in gpm
Yield_Actu	Actual yield as reported in the Statement of Completion in gpm
Yield_Clai	Claimed yield in gpm
Well_Depth	Depth of well in feet
Static_Dep	Depth to the static water level in feet
Mwbztop__F	Depth to the top of the main water bearing zone in feet
Mwbzbot__F	Depth to the bottom of the main water bearing zone in feet
HUC_Number	Hydrologic Unit Code Level 4 number
Reg_Name	HUC region name
Sub_Name	HUC subregion name
Acc_Name	HUC accounting name
Cat_Name	HUC cataloging name
MjrBasin	Major river system name (e.g. Belle Fourche River)
USGS_Qd_Id	USGS 7.5" quadrangle index number
Quad_Name	USGS 7.5" quadrangle name
HKM_Id	HKM quadrangle index number
Dgtl_Base	USGS 7.5" quadrangle digital base (Yes, No)

The locations of the agricultural wells are generally shown on Figure 7.

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Storage Reservoirs (GIS polygon shape file, PTMjrRsvr_utm27.shp and PTMjrRsvr_dd27.shp)

The reservoirs GIS data theme was developed based on the high water line as mapped on the vectorized digital base maps derived from the original USGS quadrangle maps. The associated data is listed as follows:

Resvr_Id	Reservoir identification number. Used to link to "Resvr_ID" in PTMjrRsvrRights.dbf
Resvr_Name	Reservoir name
Acres	Mapped surface area of reservoir (7.5" scale)
HUC_Number	Hydrologic Unit Code Level 4 number
Reg_Name	HUC region name
Sub_Name	HUC subregion name
Acc_Name	HUC accounting name
Cat_Name	HUC cataloging name
MjrBasin	Major river system name (e.g. Belle Fourche River)
USGS_Qd_Id	USGS 7.5" quadrangle index number
Quad_Name	USGS 7.5" quadrangle name
HKM_Id	HKM quadrangle index number
Dgtl_Base	USGS 7.5" quadrangle digital base (Yes, No)

Storage Reservoir Water Rights (Tabular database, PTMjrRsvrRights.dbf)

PerNo	Permit number (numerical portion only)
PerSfx	Permit suffix
Permit_No	Permit number (numeric portion and suffix)
Source	Source of surface water supply
Facility_N	Facility name
Tns	Township number
Rng	Range number
Sec	Section number
Use	Type of use
Priority	Priority date
Amount	Permitted diversion amount
Units	Permitted diversion amount units (gpm, cfs)
Applicant	Name of permit applicant
Active_Cap	Active storage capacity of reservoir in acre-feet
Inactive_C	Inactive storage capacity of reservoir in acre-feet
Total_Cap	Total storage capacity of reservoir in acre-feet
Resvr_Id	Reservoir id number. Used to link to "Resvr_ID" field in PTMjrRsvr_utm27.shp or PTMjrRsvr_dd27.shp

SUMMARY OF RESULTS

The results of the irrigated lands mapping task are summarized on Tables 1 and 2 and on Figure 8.

TABLE 1 SUMMARY OF IRRIGATED LANDS BY IRRIGATION CLASSIFICATION (ACRES)
SUBBASIN NAME	HUC	IRRIGATION CLASSIFICATION
		A	B	C	AB	AC	BC	ABC	TOTAL ABC	AD	BD	TOTAL AD, BD	S	H	E	ED	TOTAL E, ED	TOTAL
Little Bighorn	10080016	635	685	16	340	61	0	0	1,737	7	0	7	0	0	632	0	632	2,376
Upper Tongue	10090101	22,085	12,294	655	16,099	4,808	906	9,487	66,334	1,926	1,881	3,807	245	52	2,757	25	2,782	73,220
Middle Fork Powder	10090201	2,866	3,156	0	2,179	871	20	2,031	11,123	0	0	0	0	0	512	0	512	11,635
South Fork Powder	10090203	645	734	91	561	0	0	0	2,031	0	0	0	0	72	383	0	383	2,486
Upper Powder	10090202	1,257	987	17	724	125	0	4,850	7,960	0	0	0	1,495	2,795	619	0	619	12,869
Crazy Woman Creek	10090205	2,351	2,993	32	2,007	568	0	4,669	12,620	0	0	0	688	254	843	0	843	14,405
Clear Creek	10090206	11,326	5,622	724	6,895	3,565	598	8,056	36,786	145	316	461	140	261	1,869	193	2,062	39,710
Middle Powder	10090207	0	581	0	0	0	0	0	581	0	0	0	1,553	484	275	0	275	2,893
Little Powder	10090208	163	2,950	49	0	0	38	0	3,200	0	0	0	3,363	3,312	172	0	172	10,047
TOTAL		41,328	30,002	1584	28,805	9,998	1562	29,093	142,372	2,078	2,197	4,275	7,484	7,230	8,062	218	8,280	169,641

TABLE 2 SUMMARY OF IRRIGATED LANDS BY PRIMARY SOURCE OF SUPPLY (ACRES)
SUBBASIN NAME	HUC	PRIMARY SOURCE OF WATER SUPPLY
		Ground Water	Surface Water	TOTAL
Little Bighorn	10080016	0	2,376	2,376
Upper Tongue	10090101	0	73,220	73,220
Middle Fork Powder	10090201	58	11,577	11,635
South Fork Powder	10090203	0	2,486	2,486
Upper Powder	10090202	45	12,824	12,869
Crazy Woman Creek	10090205	97	14,308	14,405
Clear Creek	10090206	20	39,690	39,710
Middle Powder	10090207	0	2,893	2,893
Little Powder	10090208	0	10,047	10,047
TOTAL		220	169,421	169,641

Figure 8
Acreage of Irrigated Land by Irrigation Classification

REFERENCES

HKM Engineering Inc.. Agricultural Water Use, Technical Memorandum, Northeast Wyoming River Basins Plan, February 2002. Billings, Montana

HKM Engineering Inc.. Irrigated Crops, Technical Memorandum, Northeast Wyoming River Basins Plan, February 2002. Billings, Montana

Wyoming State Engineers Office, Tabulation of Adjudicated Surface Water Rights of the State of Wyoming, Water Division Number Two, October 1999