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 1,283
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Maxwell Sheridan County | 30 | 1901 | Low | Poor |
| Massae Uinta County | 24 | 1968 | Low | Fair |
| Mary Stock Johnson County | 38 | 1970 | Low | Poor |
| Mary Stock Campbell County | 29 | 1964 | Low | Fair |
| Mary Stead Natrona County | 14 | 1909 | Low | Fair |
| Mary No. 2 Johnson County | 22 | 1973 | Low | Fair |
| Mary No. 1 Carbon County | 38 | 1948 | Low | Poor |
| Marton Johnson County | 31 | 1963 | Low | Poor |
| Martin-Thompson Weston County | 27 | 1939 | Low | Fair |
| Martin Uinta County | 27 | 1958 | Low | Poor |
| Martens 9-368-1 Weston County | 20 | 1939 | Low | Not Rated |
| Marsh and Company No. 7 Carbon County | 25 | 1917 | Low | Poor |
| Marlatt Goshen County | 9 | 1956 | Low | Fair |
| Margaret No.2 Johnson County | 30 | 2004 | Low | Fair |
| Margaret Johnson County | 33 | 1966 | Low | Fair |
| Manke Niobrara County | 27 | 1950 | Low | Poor |
| Mallard #1 Johnson County | 26 | 1999 | Low | Fair |
| Magoon No. 1 Niobrara County | 25 | 1959 | Low | Fair |
| Madonna Johnson County | 35 | 1973 | Low | Poor |
| Macumba Stockwater Crook County | 25 | 1964 | Low | Fair |
| Mackey Park County | 15 | 2000 | Low | Satisfactory |
| Lynx Dam Natrona County | 31 | 1956 | Low | Unsatisfactory |
| Lyle Johnson County | 37 | 1953 | Low | Poor |
| Lula Johnson County | 36 | 1963 | Low | Fair |
| Luce Park County | 19 | 1912 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.