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 901–925 of 1,490
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mule Creek Albany County | 30 | 1911 | Low | Fair |
| Mule Creek No. 1 Niobrara County | 30 | 1962 | Low | Poor |
| Mullen Campbell County | 22 | 1970 | Low | Poor |
| Municipal Golf Course Sheridan County | 32 | 1980 | Low | Poor |
| Murk Stock Johnson County | 32 | 1962 | Low | Fair |
| Murphy Johnson County | 25 | 1970 | Low | Poor |
| M. W. Reservoir Weston County | 35 | 1912 | Low | Poor |
| Myers Uinta County | 43 | 1954 | Significant | Poor |
| Myrtle Campbell County | 29 | 1963 | Low | Fair |
| Natural Bridge Fremont County | 21 | — | Low | Poor |
| Neil Johnson County | 49 | 2008 | Low | Fair |
| Newcastle Wastewater Treatment (Cell 1) Weston County | 15 | 1988 | Low | Fair |
| Newcastle Wastewater Treatment (Cell 2) Weston County | 15 | 1988 | Low | Fair |
| Newcastle Wastewater Treatment (Cell 3) Weston County | 15 | 1988 | Low | Fair |
| Newcastle Wastewater Treatment (Cell 4) Weston County | 15 | 1988 | Low | Fair |
| New Deal No. 1 Niobrara County | 46 | 1972 | Low | Poor |
| Newell Albany County | 31 | 1969 | Low | Poor |
| New Fork Lake Sublette County | 37 | 1925 | High | Not Rated |
| New Haven Lake Crook County | 36 | 2013 | Low | Fair |
| Newland No. 4 Crook County | 22 | 1955 | Low | Poor |
| Nichols No. 2 Converse County | 25 | 1962 | Low | Poor |
| Nicolaysen Natrona County | 22 | 1899 | Significant | Fair |
| Nicolaysen No. 2 Natrona County | 21 | 1909 | Low | Fair |
| Nielson Fremont County | 15 | 1934 | Low | Poor |
| Nighthawk Facility - Phase 2 (Pit3) & Phase 3 (Pit 4) Converse County | 29 | 2020 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.