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 801–825 of 1,283
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Newland No. 4 Crook County | 22 | 1955 | Low | Poor |
| Nichols No. 2 Converse County | 25 | 1962 | Low | Poor |
| 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 |
| Nighthawk Facility Pit 5 Converse County | 28 | 2021 | Low | Not Rated |
| Nimmo No. 8 Laramie County | 26 | 1942 | Low | Poor |
| Ninth Parallel Sublette County | 26 | 1972 | Low | Fair |
| No. 3 Tailings Sweetwater County | 23 | 1980 | Low | Fair |
| No. 5a Sweetwater County | 70 | 1975 | Low | Fair |
| Norall No. 1 Campbell County | 38 | — | Low | Fair |
| North Antelope Shop Campbell County | 29 | 1983 | Low | Fair |
| North Jack Rabbit Johnson County | 21 | 1969 | Low | Fair |
| North Laramie Land Company No. 1 Platte County | 30 | 1912 | Low | Poor |
| North Logan Det. Dam Fremont County | 25 | 1952 | Low | Poor |
| North Poker Creek Johnson County | 33 | 1963 | Low | Fair |
| North Prong No. 1 Sheridan County | 26 | 2002 | Low | Fair |
| North Trail Campbell County | 25 | 1941 | Low | Poor |
| North Windmill Campbell County | 47 | 2006 | Low | Fair |
| N & S Big Horn County | 20 | 1946 | Low | Fair |
| Nw Pearson Campbell County | 48 | 1970 | Low | Fair |
| O Bar O No. 3 Platte County | 33 | 1970 | Low | Fair |
| Ocean Lake Habitat No. 2 Fremont County | 7 | 1973 | Low | Fair |
| Ocean Lake Habitat No. 2 Dike A Fremont County | 7 | 1973 | Low | Fair |
| Ocean Lake Habitat No. 5 Fremont County | 9 | 1973 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.