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 526–550 of 1,490
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pacific No. 2 Fremont County | 18 | 1922 | Low | Poor |
| P16-5 Reservoir Campbell County | 49 | 2006 | Low | Poor |
| Outer Drive Flood Detention Natrona County | 50 | 1980 | Low | Fair |
| O S W Fremont County | 28 | 1912 | High | Poor |
| Oshoto Crook County | 23 | 1954 | Low | Fair |
| Orr Crook County | 33 | 1976 | Low | Fair |
| Orchard Washakie County | 30 | 1925 | Low | Fair |
| Orchard Washakie County | 42 | 1941 | Low | Fair |
| One Mile Laramie County | 35 | 1907 | Significant | Poor |
| Ollie Stock Sheridan County | 25 | 1963 | Low | Poor |
| Old Smuggler Albany County | 22 | 1956 | Low | Fair |
| Okie Draw Dam Natrona County | 26 | 1964 | Low | Unsatisfactory |
| Okie Fremont County | 26 | 1898 | Significant | Poor |
| Okeson Campbell County | 36 | 1945 | Low | Fair |
| Oil Well Stock Sheridan County | 26 | 1969 | Low | Fair |
| Odegard 6-12-55-77 Sheridan County | 29 | 2010 | Low | Fair |
| Ocean Lake Habitat No. 6 Fremont County | 9 | 1973 | Low | Poor |
| Ocean Lake Habitat No. 5 Fremont County | 9 | 1973 | Low | Poor |
| Ocean Lake Habitat No. 2 Dike A Fremont County | 7 | 1973 | Low | Fair |
| Ocean Lake Habitat No. 2 Fremont County | 7 | 1973 | Low | Fair |
| O Bar O No. 3 Platte County | 33 | 1970 | Low | Fair |
| Oak Creek Crook County | 41 | 1976 | Significant | Fair |
| Nw Pearson Campbell County | 48 | 1970 | Low | Fair |
| N & S Big Horn County | 20 | 1946 | Low | Fair |
| North Windmill Campbell County | 47 | 2006 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.