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 26–39 of 39
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Gardiner Lower Bear Lake County | 21 | 1935 | Low | Poor |
| Foreman Owyhee County | 21 | 1929 | Significant | Poor |
| Flying Joseph Dam Custer County | 14 | 2008 | Low | Poor |
| Fish Creek Blaine County | 92 | 1923 | High | Poor |
| Fife Bear Lake County | 13 | — | Low | Poor |
| Elk River Clearwater County | 22 | 1951 | Low | Poor |
| Curlew Valley Oneida County | 41 | 1911 | Significant | Poor |
| Challis Lake Custer County | 19 | 1951 | Low | Poor |
| Boulder Meadow Valley County | 35 | 1968 | Significant | Poor |
| Blanchard Creek Bonner County | 19 | 1910 | Significant | Poor |
| Billy Creek Lemhi County | 16 | 1916 | Low | Poor |
| Barber Ada County | 26 | 1904 | Significant | Poor |
| Arcadia Upper Fremont County | 21 | 1912 | Low | Poor |
| Alder Owyhee County | 21 | 1909 | Low | Poor |
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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.