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 301–325 of 1,490
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Silver Lake Carbon County | 23 | 1931 | Low | Fair |
| Silver Creek Reservoir Fremont County | 25 | 1941 | Low | Fair |
| Sid No. 1 Albany County | 18 | 1950 | Low | Poor |
| Sides No. 1 Niobrara County | 30 | 1952 | Low | Fair |
| Sibley Sheridan County | 35 | 1938 | High | Not Rated |
| Shutter Campbell County | 38 | 2009 | Low | Fair |
| Shoshone Lake Fremont County | 46 | 1959 | High | Fair |
| Shorty'S Washakie County | 26 | 1962 | Low | Poor |
| Shirley Basin Reservoir Carbon County | 25 | 1941 | Low | Not Rated |
| Sherwin 9-249-6 Weston County | 31 | 1954 | Low | Not Rated |
| Shellhart Fish & Stock Albany County | 27 | 1976 | Low | Poor |
| Shell Creek Natrona County | 23 | 1944 | Low | Poor |
| Shell Creek Big Horn County | 50 | 1957 | High | Not Rated |
| Sheep Mountain Carbon County | 42 | 1946 | Low | Fair |
| Shearing Pen Campbell County | 24 | 1943 | Low | Fair |
| Shear Enlargement of Cochrun Crook County | 35 | 2017 | Low | Fair |
| Sg Palo Johnson County | 27 | 2004 | Low | Fair |
| Sewage Lagoon Sweetwater County | 12 | 1976 | Low | Fair |
| Settling Pond No. 7 Campbell County | 25 | 1982 | Low | Fair |
| Settling Basin Lincoln County | 24 | 1985 | Low | Fair |
| Separation Sweetwater County | 13 | 1927 | Low | Poor |
| Seminoe Dam Carbon County | 295 | 1938 | High | Not Available |
| Seepage Lake Albany County | 7 | 1970 | Low | Fair |
| Seepage Carbon County | 18 | 1914 | Low | Poor |
| Sedgwick 9-394-1 Weston County | 26 | 1940 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.