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 126–150 of 156
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Egbert Dam Fremont County | 15 | 1982 | Low | Fair |
| Dry Creek Diversion Payette County | 35 | 1976 | Low | Fair |
| Diamond A Owyhee County | 29 | 1931 | Low | Fair |
| Delamar Wmp-1 Owyhee County | 42 | 2009 | Low | Satisfactory |
| Deep Creek No 1 Twin Falls County | 18 | 1911 | Low | Fair |
| Cross Cut Diversion Fremont County | 18 | 1938 | Low | Satisfactory |
| Craig Washington County | 18 | 1978 | Low | Fair |
| Cow Creek Elmore County | 34 | 1915 | Low | Fair |
| Courtright Dike Washington County | 12 | 1973 | Low | Fair |
| Courtright Washington County | 24 | 1973 | Low | Fair |
| City Diversion Bonneville County | 30 | 1982 | Low | Satisfactory |
| Cinnabar Washington County | 26 | 1975 | Low | Fair |
| Challis Lake Custer County | 19 | 1951 | Low | Poor |
| Cedar Creek Holding Twin Falls County | 24 | 1966 | Low | Fair |
| Casperson Franklin County | 22 | 1958 | Low | Fair |
| Campbell Blaine County | 16 | 1913 | Low | Fair |
| Bybee Owyhee County | 60 | 1987 | Low | Fair |
| Buffalo River Fremont County | 12 | 1936 | Low | Satisfactory |
| Brown Owyhee County | 26 | 1958 | Low | Fair |
| Brown Valley County | 21 | 1979 | Low | Fair |
| Bradshaw Detention Dam #4 Custer County | 49 | 1967 | Low | Not Rated |
| Bradshaw Detention Dam #3 Custer County | 33 | — | Low | Not Rated |
| Box Lake Valley County | 13 | 1935 | Low | Fair |
| Blue Creek Upper Fremont County | 18 | 1920 | Low | Fair |
| Bird Pond Lemhi County | 17 | 2010 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.