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 1–25 of 1,490
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Zip 4876-15 Fresh Water #1 Campbell County | 27 | 2023 | Low | Fair |
| Zezas Irrigation Johnson County | 43 | 1973 | Low | Poor |
| Zezas Johnson County | 25 | 1958 | Low | Poor |
| Zemba Sublette County | 16 | 1915 | Low | Poor |
| York Fs 9-118-4 Campbell County | 27 | 1973 | Low | Not Rated |
| Yesness Natrona County | 26 | 1944 | Low | Fair |
| Yates Coal Gulch 24-16 Johnson County | 38 | 2008 | Low | Fair |
| Yakju Crook County | 29 | 1962 | Low | Fair |
| Xbe 4271-14 Mixed Use #6 Campbell County | 18 | — | Low | Satisfactory |
| Xbe 4271-14 Mixed Use #5 Campbell County | 17 | — | Low | Satisfactory |
| Xbe 4271-14 Mixed Use #4 Campbell County | 17 | 2023 | Low | Satisfactory |
| Xbe 4271-14 Mixed Use #3 Campbell County | 17 | 2023 | Low | Satisfactory |
| Wyo. Refining Containment Pond Weston County | 28 | 1980 | Low | Fair |
| Wyoming Hereford Ranch No. 2 Laramie County | 31 | 1936 | Significant | Fair |
| Wyoming Hereford Ranch No. 1 Laramie County | 28 | 1930 | Significant | Fair |
| Wyoming Development Company No. 1 Platte County | 49 | 1960 | Significant | Fair |
| Wyoming Campbell County | 23 | 2006 | Low | Fair |
| W.R. Hamilton No. 2 Converse County | 20 | 1917 | Low | Poor |
| Wortham Washakie County | 20 | 1915 | Low | Fair |
| Worland Wastewater Treatment (Cell 4) Washakie County | 15 | 1992 | Low | Fair |
| Worland Wastewater Treatment (Cell 3) Washakie County | 15 | 1992 | Low | Fair |
| Worland Wastewater Treatment (Cell 2) Washakie County | 15 | 1992 | Low | Fair |
| Worland Wastewater Treatment (Cell 1) Washakie County | 15 | 1992 | Low | Fair |
| Woodruff Narrows Uinta County | 68 | 1962 | High | Fair |
| Wolff Campbell County | 31 | 2004 | Low | Fair |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.