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 248
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Moyie Boundary County | 92 | 1949 | High | Fair |
| Mountain Home Elmore County | 48 | 1884 | High | Fair |
| Mosquito Flat Custer County | 58 | 1950 | Significant | Fair |
| Morrison Franklin County | 17 | 1959 | Low | Fair |
| Mormon Camas County | 27 | 1908 | High | Fair |
| Moose Creek Latah County | 20 | 1960 | Low | Fair |
| Montpelier Creek Bear Lake County | 82 | 1971 | High | Fair |
| Monroe Washington County | 36 | 1916 | Low | Fair |
| Mill Creek Lake Lemhi County | 19 | 1928 | Low | Fair |
| Mikesell Upper Fremont County | 16 | 1945 | Low | Fair |
| Mcmullen Twin Falls County | 25 | 1948 | Significant | Fair |
| Mchan Camas County | 21 | 1918 | Low | Fair |
| Mcarthur Boundary County | 19 | 1967 | High | Fair |
| Macks Creek Owyhee County | 58 | 1993 | Significant | Fair |
| Mackay Custer County | 75 | 1918 | High | Fair |
| Lucky Friday No 3 Shoshone County | 102 | 1979 | Significant | Fair |
| Louie Lake Valley County | 18 | 1928 | Low | Fair |
| Long Tom Elmore County | 60 | 1906 | Significant | Fair |
| Lone Tree Owyhee County | 12 | 1918 | Low | Fair |
| Lodge Pond Payette County | 15 | 1910 | Significant | Fair |
| Little Valley Bonneville County | 23 | 1897 | Low | Fair |
| Little (Upper Bissel Creek Dam) Gem County | 37 | 1963 | Significant | Fair |
| Little Payette Lake Main Valley County | 25 | 1926 | High | Fair |
| Little (North Crane Creek Dam) Washington County | 28 | 1895 | Significant | Fair |
| Little Canyon Elmore County | 30 | 1919 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.