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 51–75 of 97
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| J-Ditch Effluent Lagoon Valley County | 60 | 2001 | High | Fair |
| Itafos Cooling Pond Caribou County | 20 | 1995 | High | Satisfactory |
| Island Park Dam Fremont County | 94 | 1938 | High | Not Available |
| Hulet Owyhee County | 99 | 1976 | High | Fair |
| Hot Springs No 2 Elmore County | 41 | 1968 | High | Fair |
| Henrys Lake Fremont County | 25 | 1923 | High | Fair |
| Hells Canyon Adams County | 330 | 1967 | High | Satisfactory |
| Grace Main Caribou County | 52 | 1908 | High | Fair |
| Goose Lake Adams County | 27 | 1919 | High | Fair |
| Glendale Franklin County | 73 | 1930 | High | Fair |
| Gem State Right Dike Bonneville County | 30 | 1988 | High | Satisfactory |
| Gem State Left Dike Bonneville County | 30 | 1988 | High | Satisfactory |
| Gem State Bonneville County | 40 | 1988 | High | Satisfactory |
| Foster Franklin County | 70 | 1962 | High | Fair |
| Fish Creek Blaine County | 92 | 1923 | High | Poor |
| Fairchild No. 1 (Upper) Washington County | 78 | 1975 | High | Fair |
| Equalizer Bingham County | 23 | 1937 | High | Fair |
| Dworshak Dam Clearwater County | 717 | 1973 | High | Not Available |
| Dry Creek Main Payette County | 68 | 1976 | High | Fair |
| Devil Creek Oneida County | 84 | 1969 | High | Fair |
| Deer Flat Upper Dam Canyon County | 74 | 1908 | High | Not Available |
| Deer Flat Middle Canyon County | 16 | 1911 | High | Fair |
| Deer Flat Lower Dam Canyon County | 49 | 1908 | High | Not Available |
| Deep Creek Oneida County | 91 | 1952 | High | Fair |
| Deadwood Dam Valley County | 165 | 1931 | High | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.