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 676–700 of 1,283
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Johnson No. 1 Natrona County | 20 | 1914 | Low | Fair |
| Johnson 41-23-4377 Johnson County | 29 | 2005 | Low | Fair |
| Johnson #3 Niobrara County | 22 | 1944 | Low | Poor |
| Johnson Fremont County | 32 | 1959 | Low | Poor |
| Johnson Albany County | 35 | 1962 | Low | Poor |
| John L. Campbell No. 1 Carbon County | 18 | 1912 | Low | Poor |
| John Beaton Natrona County | 37 | 1941 | Low | Poor |
| John Arambel Sublette County | 22 | — | Low | Fair |
| Joe Draw Jr. Sheridan County | 30 | 2004 | Low | Poor |
| Joe Creek Sheridan County | 30 | 1963 | Low | Fair |
| Joe Johnson County | 27 | 1957 | Low | Fair |
| J. O. Carbon County | 30 | 1946 | Low | Poor |
| J. N. Mertz Platte County | 13 | 1903 | Low | Poor |
| J-J No. 3 Sublette County | 9 | 1927 | Low | Fair |
| J & J Natrona County | 25 | 1942 | Low | Poor |
| Jim Campbell County | 27 | 2006 | Low | Fair |
| Jiggs Campbell County | 25 | 1957 | Low | Poor |
| J & H Ranch No. 1 Sheridan County | 30 | 1959 | Low | Poor |
| Jfw Corp 1-21 Water Storage Reservoir Converse County | 30 | 2015 | Low | Satisfactory |
| Jessie Crook County | 26 | 1963 | Low | Fair |
| Jerry Johns Reservoir No. 1 Sheridan County | 25 | 1977 | Low | Poor |
| Jepson No. 2 Johnson County | 22 | 1953 | Low | Fair |
| Jenson Fremont County | 44 | 1979 | Low | Fair |
| James Thompson No. 1 Stock Niobrara County | 30 | 1960 | Low | Fair |
| James Lake Albany County | 40 | 1908 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.