Idaho Dams
395 dams tracked by the National Inventory of Dams
Total Dams
395
High Hazard
97
24.6%
Poor / Unsatisfactory
42
Average Age
76 yrs
Hazard Classification
High97 (24.6%)
Significant141 (35.7%)
Low156 (39.5%)
Condition Assessment
Satisfactory76 (19.2%)
Fair248 (62.8%)
Poor / Unsatisfactory42 (10.6%)
Not Rated29 (7.3%)
Federal
33
State
14
Local
18
Private
325
Tallest Dams
- Thompson Mtis789 ft
- Dworshak Dam717 ft
- Anderson Ranch Dam456 ft
- Arrowrock Dam350 ft
- Lucky Peak Dam340 ft
High Hazard Dams
- Thompson MtisHigh
- Dworshak DamHigh
- Anderson Ranch DamHigh
- Arrowrock DamHigh
- Lucky Peak DamHigh
Poor Condition Dams
- Magic DamUnsatisfactory
- Fish CreekPoor
- OrchardPoor
- Saint JohnUnsatisfactory
- Louisa CreekPoor
All Dams in Idaho
Showing 76–100 of 156
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Louisa Creek Owyhee County | 41 | 1931 | Low | Poor |
| Louie Lake Valley County | 18 | 1928 | Low | Fair |
| Lone Tree Owyhee County | 12 | 1918 | Low | Fair |
| Little Valley Bonneville County | 23 | 1897 | Low | Fair |
| Little Crane Creek Washington County | 33 | 1908 | Low | Satisfactory |
| Lehman Creek Upper Custer County | 22 | 1925 | Low | Poor |
| Lehman Creek Lower Custer County | 21 | 1999 | Low | Poor |
| Land Washington County | 15 | 1976 | Low | Fair |
| Lamb-Weston Power County | 20 | 1974 | Low | Fair |
| Lake Cleveland Cassia County | 7 | 1914 | Low | Fair |
| Koskella Valley County | 24 | 1947 | Low | Fair |
| Kinyon Pond Dam Twin Falls County | 13 | 2014 | Low | Satisfactory |
| Kiblen North Kootenai County | 26 | 1969 | Low | Fair |
| Juniper Creek Owyhee County | 16 | 1923 | Low | Satisfactory |
| Josephine Creek Owyhee County | 24 | 1983 | Low | Fair |
| Jenkins Creek Washington County | 41 | 1915 | Low | Fair |
| Jacobs Fremont County | 19 | 1935 | Low | Fair |
| Indian Creek Upper Caribou County | 15 | 1975 | Low | Fair |
| Idaho Falls Upper Powerhouse Dam No 2 Bonneville County | 37 | 1982 | Low | Satisfactory |
| Idaho Falls Upper Diversion Dam No 1 Bonneville County | 28 | 1982 | Low | Satisfactory |
| Idaho Cobalt Wmp Lemhi County | 21 | 2019 | Low | Not Rated |
| Hulet No 2 Dike Owyhee County | 13 | 1987 | Low | Poor |
| Hubbard Dam Ada County | 23 | 1902 | Low | Not Available |
| Horseshoe Bend Diversion Boise County | 8 | 1995 | Low | Fair |
| Horseshoe Custer County | 29 | 1967 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.