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 376–395 of 395
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Beartrack Treatment Lagoon Lemhi County | 20 | 1995 | Low | Satisfactory |
| Beartrack H2o Overflow Pond Lemhi County | 52 | 1995 | Low | Satisfactory |
| Beal No 3 Valley County | 30 | 1974 | Significant | Fair |
| Barton Washington County | 52 | 1915 | Significant | Fair |
| Bar D Custer County | 26 | 1950 | Significant | Fair |
| Barber Ada County | 26 | 1904 | Significant | Poor |
| Avondale Lake Kootenai County | 9 | — | Significant | Fair |
| Ashton Fremont County | 65 | 1917 | High | Satisfactory |
| Arrowrock Dam Boise County | 350 | 1915 | High | Not Available |
| Arrowhead Reservoir Lemhi County | 20 | 1975 | Significant | Fair |
| Arcadia Upper Fremont County | 21 | 1912 | Low | Poor |
| Arcadia Lower Fremont County | 23 | 1912 | Low | Fair |
| Antelope Creek Bonneville County | 22 | 1991 | Significant | Fair |
| Andreasen Upper Franklin County | 29 | 1957 | Significant | Unsatisfactory |
| Andreasen Lower Franklin County | 33 | 1960 | Significant | Satisfactory |
| Anderson Ranch Dam Elmore County | 456 | 1950 | High | Not Available |
| American Falls Dam Power County | 104 | 1927 | High | Not Available |
| Alder Owyhee County | 21 | 1909 | Low | Poor |
| Albeni Falls Dam Bonner County | 180 | 1955 | High | Not Available |
| Aikman Gem County | 77 | 1999 | High | 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.