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 101–125 of 156
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hornet Creek Lower Washington County | 26 | 1913 | Low | Fair |
| Hollenbeak Valley County | 29 | 1972 | Low | Fair |
| Holbrook Valley County | 17 | 1955 | Low | Satisfactory |
| Henrys Fork Ranch Fremont County | 23 | 1987 | Low | Fair |
| Heil No 1 Twin Falls County | 24 | 1974 | Low | Fair |
| Hayden Lake Kootenai County | 13 | 1910 | Low | Fair |
| Haul Road Pond (Monsanto) Caribou County | 30 | 2009 | Low | Satisfactory |
| Hardisty Wilson West Owyhee County | 18 | 1918 | Low | Fair |
| Hardisty Wilson East Owyhee County | 9 | 1918 | Low | Satisfactory |
| Hagberry Owyhee County | 23 | 1925 | Low | Fair |
| Grouse Creek Main Dam Bonner County | 17 | 1992 | Low | Fair |
| Grasmere South Dike Owyhee County | 11 | 1909 | Low | Fair |
| Grasmere Middle Dam Owyhee County | 16 | 1936 | Low | Poor |
| Gorley Creek Dike Lemhi County | 16 | 1913 | Low | Poor |
| Gorley Creek Lemhi County | 19 | 1913 | Low | Poor |
| Gardiner Lower Bear Lake County | 21 | 1935 | Low | Poor |
| Foland Owyhee County | 11 | 1916 | Low | Fair |
| Flying Joseph Dam Custer County | 14 | 2008 | Low | Poor |
| Five Mile Erosion Contr Franklin County | 44 | 1952 | Low | Satisfactory |
| Fife Bear Lake County | 13 | — | Low | Poor |
| Enders Caribou County | 13 | — | Low | Satisfactory |
| Elk River Clearwater County | 22 | 1951 | Low | Poor |
| Elkington Bonneville County | 35 | 1994 | Low | Fair |
| Eld Valley County | 19 | 1976 | Low | Fair |
| Egin Canal Diversion Fremont County | 7 | 1903 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.