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 76–100 of 248
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Rio Vista Valley County | 20 | 1971 | Significant | Fair |
| Priest Lake Bonner County | 12 | 1979 | Significant | Fair |
| Post Falls North Channel Kootenai County | 31 | 1906 | High | Fair |
| Portneuf Caribou County | 55 | 1912 | High | Fair |
| Poro Valley County | 22 | 1947 | Low | Fair |
| Pitkin Valley County | 21 | 1974 | Significant | Fair |
| Pioneer Gooding County | 15 | 1910 | Significant | Fair |
| Pine Lake Valley County | 17 | 1974 | Low | Fair |
| Pershall Owyhee County | 27 | 1948 | Low | Fair |
| Payne Creek Owyhee County | 33 | 1930 | Low | Fair |
| Payette Lake Upper Valley County | 15 | 1953 | Significant | Fair |
| Payette Lake Valley County | 13 | 1943 | Significant | Fair |
| Paddock Valley Washington County | 49 | 1949 | High | Fair |
| Pacific Land Co Owyhee County | 27 | 1965 | Low | Fair |
| Oxford Franklin County | 21 | 1920 | Low | Fair |
| Oxbow Fuse Plug Adams County | 37 | 1961 | High | Fair |
| Osburn Shoshone County | 71 | — | High | Fair |
| Oneida Main Franklin County | 114 | 1920 | High | Fair |
| Oneida Embankment Franklin County | 60 | 1921 | High | Fair |
| Olson Elmore County | 24 | 1981 | Low | Fair |
| Oakley Cassia County | 145 | 1916 | High | Fair |
| North Cove Creek Washington County | 26 | 1975 | Low | Fair |
| Nash Franklin County | 21 | 1952 | Low | Fair |
| Murtaugh Lake Twin Falls County | 42 | 1905 | High | Fair |
| Munsee Twin Falls County | 23 | 1977 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.