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 551–575 of 1,490
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hal Platte County | 28 | 1968 | Low | Fair |
| Hal No. 2 Platte County | 35 | 1968 | Low | Poor |
| Hampton Detention Washakie County | 28 | 1963 | Low | Fair |
| Hanchett Albany County | 29 | 1990 | Low | Poor |
| Hanna Carbon County | 25 | 1934 | Low | Fair |
| Hannah Campbell County | 40 | 2007 | Low | Fair |
| Hannah Mahoney No. 2 Carbon County | 22 | 1909 | Low | Fair |
| Hanna Lagoon (Cell 1 & 2) Carbon County | 10 | 1988 | Low | Fair |
| Hanna Pilot Reservoir Carbon County | 27 | 2001 | Low | Fair |
| Hansen Carbon County | 16 | 1922 | Low | Poor |
| Hanson No. 2 Niobrara County | 30 | 1950 | Low | Fair |
| Hape Sheridan County | 35 | 1970 | Low | Poor |
| Hardy-Bear Creek No. 3 Converse County | 25 | 1980 | Low | Fair |
| Hardy No. 1 Converse County | 16 | 1949 | Low | Satisfactory |
| Harman Albany County | 10 | 1945 | Low | Fair |
| Harriet 4777-7 Mixed Use #1 Johnson County | 30 | — | Low | Fair |
| Harriet 4777-7 Mixed Use #2 Johnson County | 26 | 2024 | Low | Fair |
| Harriett 4777-7 Fresh Water #1 Johnson County | 17 | 2023 | Low | Fair |
| Harriett 4777-7 Freshwater #2 Johnson County | 19 | 2023 | Low | Fair |
| Harriett 4777-7 Freshwater #3 Johnson County | 24 | 2023 | Low | Fair |
| Harriett Freshwater #4 Johnson County | 21 | 2023 | Low | Fair |
| Harriett Freshwater #5 Johnson County | 21 | 2023 | Low | Fair |
| Harrington Big Horn County | 30 | 1974 | Significant | Poor |
| Harris Niobrara County | 35 | 2000 | Low | Fair |
| Harris No.2 Campbell County | 28 | 2006 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.