TECHNICAL MEMORANDUM

Introduction:

Each basin in Wyoming has reservoirs that are used to store water for various purposes. These reservoirs range from small ponds for stock water to large reservoirs for hydroelectric power and irrigation. The major reservoirs in the Snake/Salt River basin are listed in this memorandum and its appendices along with associated data.

Facility Selection:

For consistency with the other Wyoming basin plans, data has been collected on all of the major reservoirs that are of particular significance to the basin. Facilities with capacities of 1000 acre-feet or larger define this criteria. In depth data regarding these reservoirs such as capacity tables and water rights have been compiled on each of these larger facilities.

In addition to the information on key storage facilities in the basin, an inventory of reservoirs was compiled. As with the other basin plans, facilities with a dam height of 20 feet or greater or with capacities of 50 acre-feet or greater were included in the inventory. These facilities are within the limits of the Safety of Dams Law coverage.

Methodology – Data Gathering:

Data on the various reservoirs included in this memorandum were collected from a variety of sources. The main source to determine what facilities would be included was a search of the Water Rights Database obtained from the State Engineer’s Office. Also used as a source of information was the Active Dams database, as some dams listed in the Water Rights Database are not currently in operation. The Tabulation of Surface Water Rights was used to determine the water source for some of the facilities. Information was also obtained from the U.S. Bureau of Reclamation on facilities under their management. It was found during the data collection that there are a number of larger dams that were permitted at one time yet were never built, or were built and have since been removed. Generally, these facilities were to be in the vicinity of Grand Teton National Park, and some were to enlarge existing lakes. Review of the Active Dams database as well as conversations with the National Park Service helped to determine if a particular dam was in place. Dams that either were not built or have been removed were not considered for this technical memorandum.

Compact & Court Decree Issues:

According to the technical memorandum prepared by Fassett Consulting entitled “Summary of Interstate Compacts and Court Decrees”, the Snake River Compact recognizes, without restriction, all existing water rights in Wyoming and Idaho established prior to July 1, 1949. It permits Wyoming unlimited use of water for domestic and stock watering purposes, providing stock water reservoirs shall not exceed 20 acre-feet in capacity. The compact allocates to Wyoming, for all future uses, the right to divert or store 4% of the Wyoming-Idaho state line flow of the Snake River. Idaho is entitled to the remaining 96% of the flow. The use of water is limited to diversions or storage within the Snake River drainage basin unless both states agree otherwise. The compact also provides preference for domestic, stock and irrigation use of the water over storage for the generation of power.

One unique aspect of the Snake River Compact, compared to other compacts to which Wyoming is a party, is a requirement that calls for Wyoming to provide Idaho replacement storage for one-third of any usage after the first 2% is put to beneficial use. Early estimates of these replacement storage quantities, based upon the average state line flow, are 33,000 acre-feet. A valuable technical result, provided in the technical memorandum prepared by Boyle Engineering entitled “Available Surface Water Determination”, is the update of Wyoming’s current use of water in the basin. This will provide the state and water users with an important component of information for future development and project planning.

In addition to the Snake River Compact, the Roxanna Decree is in effect on Teton Creek and South Leigh Creek which feed the Teton River. These streams are on the west side of the Teton Range and are not direct tributaries of the Snake River. According to the technical memorandum entitled “Summary of Interstate Compacts and Court Decrees”, the stipulation generally sets forth that Wyoming water users shall be unlimited in their diversions from Teton Creek and its tributaries until the measured flow of the creek diminishes to 170 cubic feet per second (cfs). After that, the Wyoming water users are limited to a diversion of 1 cfs for each 50 acres of irrigated land. When the flow further reduces to 90 cfs, the flow of Teton Creek and its tributaries is divided equally between the Wyoming and Idaho water users.

For South Leigh Creek, the stipulation generally provides the appropriators in Wyoming the unlimited diversion of water until the natural flow of the creek diminishes to a total of 16 cfs. At this time the Wyoming water users are then permitted to divert one-half of the streamflow and Idaho water users can divert the balance. In general, the Roxanna Decree does not affect any storage of water at this time.

Conclusion:

As stated in the Facility Selection section of this memo, in depth data on reservoirs with storage over 1,000 acre-feet has been collected, and is presented as Appendix A. A list of the facilities in Appendix A is shown in Table 1.

All of the major reservoir facilities in the Snake/Salt River basin are owned and managed by the U.S. Bureau of Reclamation for irrigation and hydropower production in Idaho. Jackson Lake Dam and Grassy Lake Dam are managed as part of the Minidoka Project, which provides irrigation water for over 1 million acres of farmland in Idaho. Palisades Dam, part of the Palisades Project, is also managed in conjunction with the Minidoka Project. The locations of these major reservoirs are shown in Figure 1. Also, an inventory of facilities with capacity at 50 acre-feet or larger is compiled in Appendix B

Table 1. Major Reservoirs in the Snake/Salt River Basin

Reservoir	Permit No.	Year Complete	Normal Capacity (acre-feet)	Dam Height (feet)	Surface Area (acres)
Grassy Lake	4631R	1939	15,182	70	310
Jackson Lake	Various	1911	847,000	65	25,530
Palisades	Idaho	1957	1,200,000	270	16,150

Lake evaporation data included in the inventory was obtained from the Annual Lake Evaporation presented in Development of an Evaporation Map for the State of Wyoming for Purposes of Estimating Evaporation and Evapotranspiration by Larry E. Lewis. The annual lake evaporation estimates were distributed among the months of the growing season using Table IX as instructed on page 58 of the Lewis report. This method of assigning evaporation to the various reservoirs is similar to that used in other recent Wyoming basin studies.

Resources:

Fassett Consulting, Summary of Interstate Compacts and Court Decrees, Technical Memorandum, Snake/Salt River Basin Plan, 2002.

Lewis, Larry Eugene, University of Wyoming, Development of an Evaporation Map for the State of Wyoming for Purposes of Estimating Evaporation and Evapotranspiration, May, 1978.

Wyoming State Engineer’s Office, “Search Results from Active Dams Database”, transmitted by Larry Stockdale, March 26, 2002.

Wyoming State Engineer’s Office, “Search Results from Water Rights Database,” transmitted by Jeff Davis, October 19, 2001.

Wyoming State Engineer’s Office, Tabulation of Adjudicated Surface Water Rights of the State of Wyoming, Water Division Number Four, October 1999.

U.S. Bureau of Reclamation, Dataweb (http://www.usbr.gov/dataweb/) [new link 10/2009 HERE] , information on various dams, 2001-2002.

Appendix A

Key Storage Facilities

Facility: Grassy Lake Reservoir

Location: 25 miles northwest of Moran, 35 miles east of Ashton, ID. T48N, R116W.

Owner: U.S. Bureau of Reclamation

Year of Construction: 1937-9

Enlargement History: None

Total Storage: 16,200 acre-feet

Active Storage: 15,182 acre-feet

Dead Storage: Unknown due to natural portion of Grassy Lake

Area/Capacity Data: Maximum Surface Area = 310 acres

Elevation (feet)	Capacity (acre-feet)	Area (acres)
7135	0	65
7136	68	70
7137	138	75.0
7138	217	79
7139	297	84
7140	384	88
7141	474	91
7142	565	95
7143	665	99.0
7144	765	103
7145	869	107
7146	979	111
7147	1,090	116
7148	1,210	120.0
7149	1,330	124
7150	1,458	129
7151	1,588	133
7152	1,722	137
7153	1,862	141
7154	2,002	145
7155	2,151	148
7156	2,301	152
7157	2,455	157
7158	2,615	161
7159	2,775	165
7160	2,944	169
7161	3,114	173
7162	3,289	177
7163	3,469	180
7164	3,649	184
7165	3,837	188
7166	4,027	192
7167	4,220	196
7168	442	199
7169	4,620	203
7170	4,821	206
7171	5,031	209
7172	5,241	211
7173	5,451	214
7174	5,668	217
7175	588	219.0
7176	6,108	222
7177	6,328	224.0
7178	6,555	227
7179	6,785	229
7180	7,015	232
7181	7,245	235
7182	7,483	237
7183	7,723	240
7184	7,963	243
7185	8,204	245
7186	8,454	248
7187	8,704	250
7188	8,954	253
7189	9,205	256
7190	9,465	258.0
7191	9,725	261
7192	9,985	264
7193	10,251	267
7194	10,521	270
7195	10,791	273
7196	11,062	276
7197	11,342	278
7198	11,622	281.0
7199	11,902	284
7200	12,187	287
7201	12,477	289.2
7202	12,767	292
7203	13,057	294
7204	13,355	297
7205	13,655	299
7206	13,955	302
7207	14,255	304
7208	14,562	306.8
7209	14,872	309.2
7210	15,182	311.5
7211	15,492	313.9
7212	15,808	316.4
7213	16,128	319.0
7214	16,448	321.7
7215	16,768	324.3

Dam Construction Type: Zoned Earthfill/Rockfill. Dam Height = 118 feet.

End-of-Month Storage Records:

Water Rights:

Permit Number	Permitted Use	Priority Date	Volume(af)
4631R	POW, IRR, DOM	2/13/1936	15,204

Designated Use: Power Generation, Irrigation Storage, Domestic Use

Recreational Use:

Associated Irrigation Diversions: Fremont-Madison Irrigation District

Operational Discussion: Grassy Lake is managed by the U.S. Bureau of Reclamation as part of the Minidoka Project. As part of this project, the dam provides supplemental irrigation to the Fremont-Madison Irrigation District in Idaho.

Resources: Active Dams, State Engineer’s Office, transmitted by Larry Stockdale, March 26, 2002.

Search Results from Water Rights Database, State Engineer’s Office, transmitted by Jeff Davis on October 19, 2001.

DataWeb, U.S. Bureau of Reclamation

Facility: Jackson Lake

Location: Thirty miles north of Jackson on the South Fork of the Snake River. T44-48N, R114-116W.

Owner: U.S. Bureau of Reclamation

Year of Construction: 1910-1911

Enlargement History: 1916

Total Storage:

Active Storage: 847,000 acre-feet

Dead Storage: Unknown due to natural portion of Jackson Lake

Area/Capacity Data: Maximum Surface Area = 25,530 acres

Elevation (feet)	Capacity (acre-feet)	Area (acres)
6730	0	17,100
6731	17,190	17,290
6732	34,580	17,490
6733	52,180	17,710
6734	70,010	17,940
6735	88,070	18,190
6736	106,390	18,450
6737	124,980	18,730
6738	143,860	19,020
6739	163,030	19,330
6740	182,520	19,650
6741	202,330	19,960
6742	222,430	20,050
6743	242,830	20,540
6744	263,500	20,810
6745	284,450	21,080
6746	305,660	21,340
6747	327,120	21,580
6748	348,820	21,820
6749	370,750	22,040
6750	392,910	22,250
6751	415,260	22,460
6752	437,810	22,650
6753	460,550	22,830
6754	483,470	23,000
6755	506,550	23,160
6756	529,790	23,320
6757	553,190	23,480
6758	576,750	23,640
6759	600,470	23,800
6760	624,360	23,970
6761	648,400	24,130
6762	672,620	24,300
6763	697,000	24,470
6764	721,560	24,640
6765	746,280	24,810
6766	771,180	24,990
6767	796,260	25,170
6768	821,520	25,350
6769	847,000	25,540
6770	872,600	25,730

Dam Construction Type: Combined concrete gravity and zoned earthfill. Dam Height = 65 feet.

End-of-Month Storage Records:

Average End of Month Contents, 1971-2001 (based on preliminary data)

Month	Contents (acre-feet)
October	472,980
November	478,820
December	486,680
January	494,830
February	498,650
March	491,640
April	477,330
May	578,780
June	692,740
July	656,330
August	549,200
September	461,050

Water Rights:

Permit Number	Permitted Use	Priority Date	Volume(af)
894R	IRR	8/23/1906	299,000
1903R	IRR	8/18/1910	392,990
2185R	IRR	7/24/1911	438,000
2894R	IRR	5/20/1912	738,000
2895R	IRR, DOM	5/24/1913	838,000

Designated Use: Irrigation Storage, Domestic Use

Recreational Use: Boating, Fishing, Camping, Wildlife

Associated Irrigation Diversions: None

Operational Discussion: Jackson Lake Dam is managed by the U.S. Bureau of Reclamation as part of the Minidoka Project. As part of this project, the dam provides irrigation supply to the irrigation districts in Idaho. Seasonal flows from the dam are also coordinated with the Wyoming Game and Fish Department in order to provide adequate flows for fish in the Snake River.

Resources: DataWeb, U.S. Bureau of Reclamation

Search Results from Water Rights Database, State Engineer’s Office, transmitted by Jeff Davis on October 19, 2001.

Mike Beus, U.S. Bureau of Reclamation, Telephone Interview, May 29, 2002.

Area and Capacity for Jackson Lake Reservoir, U.S. Bureau of Reclamation, received from Mike Beus, July 15, 2002.

Facility: Palisades Reservoir

Location: Eighteen miles northwest of Alpine on the South Fork of the Snake River in Bonneville County, Idaho.

Owner: U.S. Bureau of Reclamation

Year of Construction: 1951-1957

Enlargement History: None

Total Storage: 1,401,000 acre-feet

Active Storage: 1,200,000 acre-feet

Dead Storage: 44,100 acre-feet

Area/Capacity Data:

Elevation (feet)	Capacity (acre-feet)	Area (acres)
5498	499	4,972
5499	5,509	5,046
5500	10,592	5,121
5501	15,751	5,197
5502	20,987	5,275
5503	26,302	5,354
5504	31,696	5,434
5505	37,170	5,514
5506	42,723	5,592
5507	48,354	5,670
5508	54,061	5,745
5509	59,842	5,818
5510	65,695	5,887
5511	71,614	5,952
5512	77,596	6,012
5513	83,636	6,068
5514	89,732	6,123
5515	95,881	6,176
5516	102,084	6,230
5517	108,341	6,284
5518	114,654	6,342
5519	121,026	6,403
5520	127,462	6,469
5521	133,967	6,540
5522	140,545	6,615
5523	147,199	6,694
5524	153,933	6,774
5525	160,749	6,857
5526	167,647	6,940
5527	174,629	7,023
5528	181,693	7,106
5529	188,839	7,187
5530	196,065	7,265
5531	203,368	7,342
5532	210,748	7,418
5533	218,203	7,493
5534	225,733	7,568
5535	233,338	7,642
5536	241,017	7,716
5537	248,769	7,790
5538	256,596	7,862
5539	264,496	7,936
5540	272,469	8,010
5541	280,515	8,083
5542	288,634	8,155
5543	296,826	8,227
5544	305,089	8,299
5545	313,423	8,370
5546	321,829	8,442
5547	330,307	8,514
5548	338,857	8,587
5549	347,481	8,661
5550	356,179	8,736
5551	364,954	8,813
5552	373,805	8,891
5553	382,735	8,969
5554	391,744	9,049
5555	400,833	9,129
5556	410,003	8,210
5557	419,252	9,290
5558	428,582	9,370
5559	437,991	9,449
5560	447,479	9,527
5561	457,045	9,604
5562	466,687	9,681
5563	476,406	9,757
5564	486,200	9,832
5565	496,070	9,908
5566	506,015	9,983
5567	516,036	10,059
5568	526,133	10,135
5569	536,306	10,211
5570	546,556	10,289
5571	556,883	10,366
5572	567,287	10,441
5573	577,765	10,515
5574	588,317	10,589
5575	598,944	10,665
5576	609,647	10,742
5577	620,429	10,822
5578	631,292	10,905
5579	642,241	10,993
5580	653,281	11,087
5581	664,417	11,185
5582	675,653	11,286
5583	686,911	11,391
5584	698,436	11,498
5585	709,990	11,609
5586	721,656	11,724
5587	733,439	11,843
5588	745,343	11,965
5589	757,371	12,091
5590	769,528	12,222
5591	781,819	12,359
5592	794,250	12,504
5593	806,830	12,656
5594	819,564	12,811
5595	832,454	12,970
5596	845,504	13,129
5597	858,712	13,288
5598	872,078	13,444
5599	885,598	13,596
5600	899,267	13,742
5601	913,079	13,884
5602	927,034	14,024
5603	941,127	14,163
5604	955,359	14,300
5605	969,727	14,435
5606	984,288	14,568
5607	998,861	14,698
5608	1,013,623	14,826
5609	1,028,512	14,951
5610	1,043,524	15,073
5611	1,058,657	15,194
5612	1,073,912	15,315
5613	1,089,286	15,435
5614	1,104,780	15,553
5615	1,120,390	15,667
5616	1,136,112	15,777
5617	1,151,941	15,882
5618	1,167,871	15,979
5619	1,183,896	16,069
5620	1,200,000	16,150
5621	1,216,219	16,266

Dam Construction Type: Zoned earthfill. Dam Height = 270 feet

End-of-Month Storage Records:

Average End of Month Contents, 1971-2001 (based on preliminary data)

Month	Contents (acre-feet)
October	745,910
November	797,340
December	821,430
January	827,240
February	821,890
March	735,840
April	661,780
May	826,600
June	1,060,580
July	926,680
August	801,090
September	716,400

Water Rights: Water rights for Palisades Reservoir are administered by the State of Idaho.

Designated Use: Irrigation Storage, Power Generation, Flood Control, Fish and Wildlife

Recreational Use: Boating, Fishing, Camping, Wildlife

Associated Irrigation Diversions: Downstream diversions are located in Idaho

Operational Discussion: Palisades Dam is part of the Palisades Project, which serves purposes such as irrigation, power generation, flood control, recreation, and fish and wildlife conservation. The dam is also operated in conjunction with the Minidoka Project to provide holdover storage for irrigation and power generation

In 1991, the U.S. Bureau of Reclamation entered into a contract with the State of Wyoming for the purchase of 33,000 acre-feet of joint use space in the reservoir. All Palisades Reservoir spaceholder contracts provide for use of a proportionate share of the water accruing to the reservoir water rights, the ability to keep unused stored water for use in subsequent years, and the option of participating in the Water District 1 Rental Pool. Additionally, Wyoming has the option of making exchanges to allow the use of their Palisades Reservoir space to retain water in Jackson Lake or to increase winter flows in the Snake River for cutthroat trout. The space also insures Wyoming’s ability to fulfill Snake River Compact obligations.

Resources: DataWeb, U.S. Bureau of Reclamation

Appendix B

Storage Facility Inventory

Afton Electric Reservoir
Tributary:	Swift Creek, Tributary Salt River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
4091R	Town of Afton		1938	29, T32N, R118W	42º43’32”	110º54’32”
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
30		69		48	5	P
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
40	27.52	4.82	5.59	6.71	6.16	4.24

Baldwin Reservoir
Tributary:	Teton Creek
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
10498R	Alfred E. Baldwin		1995	21, T44N, R118W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
20				30	3	S,F
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
34	23.39	4.09	4.75	5.71	5.24	3.60

Beaver Pond Reservoir
Tributary:	Dry Gulch
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
1424R	Royer & Shinkle		1908	18, T43N, R114W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
10				79	11	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
34	23.39	4.09	4.75	5.71	5.24	3.6

Bergman Lake Reservoir
Tributary:	Indian Creek, Trib. Squirrel Cr., Trib falls R., Trib. Henrys Fk. R.
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
6001R	Squirrel Creek Irrigation Company		1953	5, T47N, R118W	44º03’34”	111º02’20”
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
12		373		201	37	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
33	22.70	3.97	4.61	5.54	5.09	3.50

Cottonwood Lake
Tributary:	Cottonwood Creek, Tributary Salt River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
0253R	U.S. Forest Service		1918	30, T31N, R117W	42º38’09”	110º49’02”
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
11		240		70	32	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
41	28.21	4.94	5.73	6.88	6.32	4.34

Flat Creek Ranch Reservoir
Tributary:	Flat Creek, Tributary Little Gros Ventre River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
9068R	Flat Creek Ranch		1967	8, T41N, R114W	43º31’29”	110º32’27”
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
11				151	46	R,F
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
34	23.39	4.09	4.75	5.71	5.24	3.60

Grassy Lake
Tributary:	Grassy Creek, Tributary Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
4631R	U.S. Bureau of Reclamation		1939	T48N, R116W	44º07’48”	110º49’06”
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
118		16,200		15,182	310	P,I,D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
32	22.02	3.85	4.47	5.37	4.93	3.39

Hardeman Reservoir
Tributary:	Springs, Beaver Lake, Tributary Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
5603R	Gerrit Hardeman		1947	18, T43N, R114W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
15				93	13	S,I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
34	23.39	4.09	4.75	5.71	5.24	3.60

Hardeman #2 Reservoir
Tributary:	Hardeman Creek, Tributary Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
5737R	Gerrit Hardeman		1950	21, T43N, R114W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
15				133	19	I,D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
34	23.39	4.09	4.75	5.71	5.24	3.60

Indian Lake Reservoir
Tributary:	Indian Lake Basin, Tributary Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
6000R	Squirrel Creek Irrigation Company		1954	4, T47N, R118W	44º04'01"	111º02'07"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
10		2034		904	252	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
31	21.33	3.73	4.33	5.20	4.78	3.28

Jackson Lake
Tributary:	Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
2895R	U.S.Bureau of Reclamation		1911	T44-48N, R114-6W	43º51'36"	110º35'24"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
65		873,000		847,000	25,530	I,D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
32	22.02	3.85	4.47	5.37	4.93	3.39

Jackson Wastewater Treatment Plant
Tributary:	Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
8114R	Town of Jackson		1980		43º24'05"	110º46'53"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
23				260	20	D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
36	24.77	4.33	5.03	6.04	5.55	3.81

Leidy Lake
Tributary:	Leidy Creek, Tributary South Fork Spread Creek
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
8632R	Wyoming Game & Fish Department		1983	2,T43N, R113W	43º43'13"	110º22'21"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
8				65	14	F
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
33	22.70	3.97	4.61	5.54	5.09	3.50

McLean Reservoir
Tributary:	McLean Creek, Tributary Muddy Creek, Tributary Hoback River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
5484R	Miller Land & Livestock Company		1965	23,T36N, R113W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
20				16	3	S
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
37	25.46	4.45	5.17	6.21	5.70	3.92

Melody Ranch Pond
Tributary:	Flat Creek, Little Gros Ventre
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
9884R	Melody Ranch		1993	28, T40N, R116W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
				70	6	F
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
37	25.46	4.45	5.17	6.21	5.70	3.92

Porter Reservoir
Tributary:	Wallace Creek, Tributary Shive Spring Branch, Trib. Buffalo Fork
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
5735R	Bruce Porter Estate		1951	2,T44N, R113W	43º48'01"	110º23'15"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
17		52		52	7	S,I,D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
32	22.02	3.85	4.47	5.37	4.93	3.39

Strawberry Creek Reservoir
Tributary:	Strawberry Creek, Tributary Salt River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
5684R	Lower Valley Energy		1949	30, T34N, R117W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
22				10	3	P
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
39	26.83	4.70	5.45	6.55	6.01	4.13

Teal Reservoir
Tributary:	Salt River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
9837R	Wyoming Game & Fish Department		1992	3, T44N, R119W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
10				79	32	WL,WT
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
40	27.52	4.82	5.59	6.71	6.16	4.24

Timber Creek Reservoir
Tributary:	Timber Creek, Tributary Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
2108R	Mary A. Cheney		1911	15, T44N, R116W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
30				13	1	I,D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
37	25.46	4.45	5.17	6.21	5.70	3.92

Tracy Lake
Tributary:	Randolph Creek, Brush Creek, and Buffalo Fork River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
9447R	ANK Corporation		1928	19, T44N, R112W	43º50'54"	110º22'00"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
20		646		380	47	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
32	22.02	3.85	4.47	5.37	4.93	3.39

Tucker Ranch No. 23 Reservoir
Tributary:	Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
10159R	Tucker Ranch Development		1993	13, T44N, R117W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
				146	11	WT,F,A
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
37	25.46	4.45	5.17	6.21	5.70	3.92

Tucker Ranch No. 24 Reservoir
Tributary:	Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
10160R	Tucker Ranch Development		1993	12, T41N, R117W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
				270	16	WT,F,A
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
37	25.46	4.45	5.17	6.21	5.70	3.92

Two Ocean Reservoir
Tributary:	Two Ocean Creek
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
3487R	Osgood Land & Livestock Company		1918	2, T44N, R114W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
10				1024	512	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
32	22.02	3.85	4.47	5.37	4.93	3.39

Uhl Reservoir
Tributary:	Spread Creek, Tributary Snake River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
5380R	Jackson Hole Preserve Inc.		1948	1, T44N, R114W	43º48'18"	110º28'54"
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
20		756		543	83	I
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
32	22.02	3.85	4.47	5.37	4.93	3.39

West Borrow Area Lake
Tributary:	Imeson Spring River
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
8116R	Town of Jackson		1980	29, T40N, R116W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
				96	6	W,F
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
37	25.46	4.45	5.17	6.21	5.70	3.92

Woodward Reservoir
Tributary:	Turpin Creek
Permit No.	Owner/Operator		Year Completed	Location
				S-T-R	Latitude	Longitude
3845R	Wm. Woodward		1922	21, T43N, R114W
Dam Height (ft)		Max. Capacity (af)		Normal Capacity (af)	Max. Surface Area (acres)	Purposes
15				120	24	I,D
Lewis Evaporation Estimates (inches/acre)
Annual	May-Sept.	May	June	July	August	September
34	23.39	4.09	4.75	5.71	5.24	3.60

Major Reservoirs