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 1–25 of 141
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Andreasen Lower Franklin County | 33 | 1960 | Significant | Satisfactory |
| Andreasen Upper Franklin County | 29 | 1957 | Significant | Unsatisfactory |
| Antelope Creek Bonneville County | 22 | 1991 | Significant | Fair |
| Arrowhead Reservoir Lemhi County | 20 | 1975 | Significant | Fair |
| Avondale Lake Kootenai County | 9 | — | Significant | Fair |
| Barber Ada County | 26 | 1904 | Significant | Poor |
| Bar D Custer County | 26 | 1950 | Significant | Fair |
| Barton Washington County | 52 | 1915 | Significant | Fair |
| Beal No 3 Valley County | 30 | 1974 | Significant | Fair |
| Big Blue Creek Owyhee County | 34 | 1910 | Significant | Fair |
| Blackfoot Bridge Wmp #1 & #2 Caribou County | 35 | 2012 | Significant | Satisfactory |
| Blackhawk Lake Valley County | 45 | 1968 | Significant | Fair |
| Blanchard Creek Bonner County | 19 | 1910 | Significant | Poor |
| Boggeman Lemhi County | 24 | 1963 | Significant | Fair |
| Boulder Lake Valley County | 15 | 1902 | Significant | Fair |
| Boulder Meadow Valley County | 35 | 1968 | Significant | Poor |
| Bray Lake Gooding County | 36 | 1915 | Significant | Fair |
| Bruce Washington County | 24 | 1980 | Significant | Fair |
| Chilco Kootenai County | 17 | 1907 | Significant | Fair |
| Conda Site Mtis (Simplot) Caribou County | 45 | 1979 | Significant | Satisfactory |
| Condie Franklin County | 41 | 1948 | Significant | Satisfactory |
| Corral Creek Valley County | 43 | 1952 | Significant | Fair |
| Cottonwood Creek Lower Ada County | 15 | 1961 | Significant | Fair |
| Cottonwood Creek Middle Ada County | 20 | 1961 | Significant | Fair |
| Cottonwood Creek Upper Ada County | 18 | 1961 | Significant | 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.