Dams in Wyoming

1,490 damsAvg age: 62 years

High Hazard

104

Significant

1,284

Low Hazard

Dam Safety in Wyoming

Wyoming has 1,490 dams tracked in the National Inventory of Dams. Of these, 99 (6%) are classified as high hazard — meaning failure would probably cause loss of human life — and 104 are classified as significant hazard. Currently, 576 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.

The average dam in Wyoming is 62 years old. As dams age, inspection frequency and maintenance become increasingly important for ensuring public safety. The most common purpose for dams in Wyoming is irrigation, accounting for 740 of the state's dams.

The federal inventory is not every dam in Wyoming. It includes dams rated high or significant hazard, plus low-hazard dams above a size threshold (taller than 25 feet holding more than 15 acre-feet, or taller than 6 feet holding more than 50 acre-feet). Small, older dams below that line are usually left out, even though they can still shape the streams around them. The state's own dam safety program often tracks many more, and it is the agency that inspects most of them.

Use the search above to find dams near any address in Wyoming, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.

Wyoming Dam Facts

Total Dams	1,490
High Hazard Dams	99
Average Dam Age	62 years
Tallest Dam	295 ft
Largest Reservoir	1,473,118 acre-ft
Poor/Unsatisfactory Condition	576

Notable Dams in Wyoming

Seminoe Dam295 ftHigh Alcova Dam265 ftHigh Kortes Dam244 ftHigh Boysen Dam220 ftHigh Pathfinder Dam214 ftHigh

Explore Wyoming Dams

Oldest DamsEarliest dams in Wyoming Tallest DamsHighest dams in Wyoming

High Hazard Dams in Wyoming

Dam	County	Height	Condition	Purpose
Seminoe Dam	Carbon	295 ft	Not assessed	Hydroelectric
Alcova Dam	Natrona	265 ft	Not assessed	Hydroelectric
Kortes Dam	Carbon	244 ft	Not assessed	Hydroelectric
Boysen Dam	Fremont	220 ft	Not assessed	Flood Risk Reduction
Pathfinder Dam	Natrona	214 ft	Not assessed	Hydroelectric
Anchor Dam	Hot Springs	208 ft	Not assessed	Irrigation
Greybull Valley (1st Enl.)	Park	207 ft	Fair	Irrigation
Glendo Dam	Platte	196 ft	Not assessed	Flood Risk Reduction
Meeks Cabin Dam	Uinta	185 ft	Not assessed	Irrigation
Keyhole Dam	Crook	168 ft	Not assessed	Flood Risk Reduction
High Savery	Carbon	165 ft	Fair	Irrigation
Lower Sunshine	Park	162 ft	Fair	Irrigation
Upper Sunshine	Park	160 ft	Fair	Irrigation
Rob Roy	Albany	150 ft	Fair	Water Supply
Fontenelle Dam	Lincoln	139 ft	Not assessed	Fish and Wildlife Pond
Guernsey Dam	Platte	137 ft	Not assessed	Hydroelectric
Buffalo Bill-diamond Creek Dike	Park	136 ft	Not assessed	Fish and Wildlife Pond
Laprele	Converse	135 ft	Unsatisfactory	Irrigation
Lake Desmet (north Dam)	Johnson	120 ft	Fair	Water Supply
Lake Desmet (south Dam)	Johnson	120 ft	Fair	Water Supply
Lake Desmet (a,b,c & Spillway Dikes)	Johnson	120 ft	Fair	Water Supply
Grassy Lake Dam	Teton	118 ft	Not assessed	Irrigation
Hog Park Main Dam	Carbon	118 ft	Not assessed	Water Supply
Tie Hack	Johnson	110 ft	Fair	Water Supply
Crystal Lake	Laramie	108 ft	Fair	Water Supply
Upper Van Tassell	Laramie	98 ft	Poor	Water Supply
Grayrocks	Platte	95 ft	Fair	Other
Big Goose Park (3rd Enl.)	Sheridan	95 ft	Fair	Irrigation
Glendo Dike 3	Platte	94 ft	Not assessed	Flood Risk Reduction
Washakie	Fremont	93 ft	Satisfactory	Irrigation
Twin Lakes No. 1	Sheridan	91 ft	Not assessed	Water Supply
Granite Springs	Laramie	90 ft	Fair	Water Supply
Viva Naughton	Lincoln	90 ft	Fair	Water Supply
Big Sandy Dam	Sweetwater	85 ft	Not assessed	Flood Risk Reduction
Sulphur Creek	Uinta	85 ft	Fair	Irrigation
Jackson Lake Dam	Teton	84 ft	Not assessed	Flood Risk Reduction
Bull Lake Dam	Fremont	81 ft	Not assessed	Flood Risk Reduction
Dull Knife	Johnson	80 ft	Fair	Irrigation
Mcmurry No. 4	Natrona	78 ft	Satisfactory	Fish and Wildlife Pond
Healy	Johnson	76 ft	Not assessed	Irrigation
Adelaide	Big Horn	74 ft	Not assessed	Irrigation
Woodruff Narrows	Uinta	68 ft	Fair	Irrigation
Kearney Lake	Johnson	67 ft	Fair	Irrigation
Hawk Springs	Goshen	64 ft	Poor	Irrigation
Glendo Dike 2	Platte	63 ft	Not assessed	Flood Risk Reduction
Eastgate	Natrona	60 ft	Poor	Fish and Wildlife Pond
Willow Park	Johnson	60 ft	Not assessed	Irrigation
Windy Draw	Sheridan	59 ft	Fair	Irrigation
Spring Canyon	Goshen	58 ft	Fair	Fire Protection, Stock, Or Small Fish Pond
Wagner	Sheridan	58 ft	Fair	Irrigation
Muddy Guard No. 2 South Dam	Johnson	57 ft	Fair	Irrigation
Broadbent Enlargement of Heber	Uinta	57 ft	Not assessed	Irrigation
Bear Claw Love No. 1	Sheridan	53 ft	Fair	Irrigation
Corral	Park	52 ft	Fair	Irrigation
Shell Creek	Big Horn	50 ft	Not assessed	Irrigation
Big Horn Dike C	Johnson	50 ft	Fair	Irrigation
Big Horn Dike B	Johnson	50 ft	Fair	Irrigation
Glendo Dike 1	Platte	50 ft	Not assessed	Flood Risk Reduction
Little Robber Det. Dam X	Carbon	48 ft	Poor	Debris Control
Shoshone Lake	Fremont	46 ft	Fair	Irrigation
Enlargement of Worthen Meadows	Fremont	46 ft	Not assessed	Water Supply
Cardine Keith	Natrona	45 ft	Poor	Irrigation
Leavitt	Big Horn	45 ft	Poor	Irrigation
Big Horn Dike a	Johnson	45 ft	Fair	Irrigation
Dump Draw	Johnson	42 ft	Satisfactory	Flood Risk Reduction
Cook Lake	Crook	40 ft	Not assessed	Recreation
Padlock No. 1 a Five Mile	Sheridan	40 ft	Fair	Irrigation
Upper Delta (north Offset Dam & West Offset Dam)	Sweetwater	40 ft	Fair	Tailings
Sawmill	Sheridan	38 ft	Fair	Irrigation
Snyder Creek Det Dam X	Fremont	38 ft	Unsatisfactory	Flood Risk Reduction
Pathfinder Dike	Natrona	38 ft	Not assessed	Fish and Wildlife Pond
New Fork Lake	Sublette	37 ft	Not assessed	Irrigation
Cloud Peak	Johnson	36 ft	Fair	Irrigation
Sibley	Sheridan	35 ft	Not assessed	Recreation
Hog Park Saddle Dam No. 2	Carbon	34 ft	Not assessed	Water Supply
Meadowlark	Washakie	33 ft	Not assessed	Recreation
Teton Reservoir	Carbon	33 ft	Fair	Recreation
South Spring Creek Lake	Carbon	33 ft	Fair	Irrigation
Silver Lake	Sublette	32 ft	Poor	Irrigation
Sixty Seven	Sublette	32 ft	Fair	Irrigation
North Spring Creek	Carbon	31 ft	Poor	Irrigation
Lake Owen	Albany	30 ft	Fair	Water Supply
Enl. Turpin Park	Carbon	30 ft	Fair	Irrigation
Ray Lake	Fremont	30 ft	Satisfactory	Irrigation
Kemmerer	Lincoln	30 ft	Poor	Water Supply
Dome Lake No. 1	Sheridan	30 ft	Fair	Irrigation
Enterprise	Fremont	29 ft	Fair	Irrigation
O S W	Fremont	28 ft	Poor	Irrigation
Cow Creek Lake	Carbon	28 ft	Fair	Irrigation
Little Sage Creek Reservoir	Carbon	26 ft	Satisfactory	Debris Control
Hog Park Saddle Dam No. 1	Carbon	26 ft	Not assessed	Water Supply
Washington Memorial	Crook	24 ft	Fair	Irrigation
Middle Piney Lake Dam	Sublette	24 ft	Poor	Recreation
Westside	Campbell	23 ft	Fair	Flood Risk Reduction
Carey Detention	Laramie	22 ft	Fair	Flood Risk Reduction
Big Sandy Dike	Sweetwater	22 ft	Not assessed	Flood Risk Reduction
Eastdale Creek Detention No.2	Natrona	19 ft	Fair	Flood Risk Reduction
Badwater Creek Dam	Natrona	15 ft	Poor	Other
Pilot Butte Embankment 3	Fremont	12 ft	Not assessed	Irrigation