Wyoming Dams
1,490 dams tracked by the National Inventory of Dams
Total Dams
1,490
High Hazard
100
6.7%
Poor / Unsatisfactory
576
Average Age
62 yrs
Hazard Classification
High100 (6.7%)
Significant104 (7.0%)
Low1,283 (86.1%)
Condition Assessment
Satisfactory45 (3.0%)
Fair752 (50.5%)
Poor / Unsatisfactory576 (38.7%)
Not Rated117 (7.9%)
Federal
193
State
22
Local
82
Private
1,174
Tallest Dams
- Buffalo Bill Dam350 ft
- Seminoe Dam295 ft
- Alcova Dam265 ft
- Kortes Dam244 ft
- Boysen Dam220 ft
High Hazard Dams
- Buffalo Bill DamHigh
- Seminoe DamHigh
- Alcova DamHigh
- Kortes DamHigh
- Boysen DamHigh
Poor Condition Dams
- LapreleUnsatisfactory
- Upper Van TassellPoor
- Hawk SpringsPoor
- EastgatePoor
- BischoffPoor
All Dams in Wyoming
Showing 601–625 of 752
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sides No. 1 Niobrara County | 30 | 1952 | Low | Fair |
| Silver Creek Reservoir Fremont County | 25 | 1941 | Low | Fair |
| Silver Lake Carbon County | 23 | 1931 | Low | Fair |
| Simmons Johnson County | 25 | 1962 | Low | Fair |
| Sinnard Goshen County | 26 | 1935 | Significant | Fair |
| Sixty Seven Sublette County | 32 | 1942 | High | Fair |
| Skinner Goshen County | 25 | 1973 | Low | Fair |
| Slaughters & Patzold Converse County | 24 | 1940 | Low | Fair |
| Slough Reservoir Fremont County | 16 | 1939 | Low | Fair |
| Smith No. 2 Johnson County | 25 | 1959 | Low | Fair |
| Snider No. 1 Town Draw Sheridan County | 24 | 1961 | Low | Fair |
| Snowflake Johnson County | 40 | 2006 | Low | Fair |
| Snyder No. 1 Big Horn County | 21 | 1995 | Low | Fair |
| Snyder No. 2 Big Horn County | 21 | 1994 | Low | Fair |
| Soda Lake Draw No. 1 Albany County | 11 | 1950 | Low | Fair |
| Soda Lake Wetlands Sublette County | 15 | 1989 | Low | Fair |
| Solid Waste Disposal Cell C Sweetwater County | 18 | 2011 | Low | Fair |
| Solid Waste Disposal Cell D Sweetwater County | 46 | 1977 | Low | Fair |
| Solid Waste Disposal Cell J Sweetwater County | 50 | 2011 | Low | Fair |
| Sonny'S Campbell County | 29 | 2006 | Low | Fair |
| Sore Finger Big Horn County | 24 | 1965 | Low | Fair |
| Sore Paw Washakie County | 26 | 1964 | Low | Fair |
| South Fork Bud Kimball Washakie County | 25 | — | Low | Fair |
| South Ricketts Flat Johnson County | 48 | 1972 | Low | Fair |
| South Spring Creek Lake Carbon County | 33 | 1917 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.