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 201–225 of 395
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| King Reservoir South Dam Owyhee County | 33 | 1969 | Significant | Fair |
| Kimberly Lake Lemhi County | 27 | 1970 | Significant | Fair |
| Kiblen West Kootenai County | 23 | 1969 | Significant | Fair |
| Kiblen North Kootenai County | 26 | 1969 | Low | Fair |
| Jussila Bow Valley County | 23 | 1949 | Significant | Fair |
| Juniper Creek Owyhee County | 16 | 1923 | Low | Satisfactory |
| Jughandle Estates Valley County | 28 | 1974 | Significant | Fair |
| Jug Creek Upper Valley County | 32 | 1946 | Significant | Fair |
| Josephine Creek Owyhee County | 24 | 1983 | Low | Fair |
| Johnson Franklin County | 28 | 1860 | Significant | Fair |
| Jenkins Creek Washington County | 41 | 1915 | Low | Fair |
| Jemima K Valley County | 71 | 1974 | Significant | Fair |
| J-Ditch Effluent Lagoon Valley County | 60 | 2001 | High | Fair |
| J-Canal Reregulating Cassia County | 19 | 1994 | Significant | Satisfactory |
| Jacobs Fremont County | 19 | 1935 | Low | Fair |
| Itafos Tailings Pond #4 Caribou County | 71 | 1985 | Significant | Satisfactory |
| Itafos Cooling Pond Caribou County | 20 | 1995 | High | Satisfactory |
| Island Park Dam Fremont County | 94 | 1938 | High | Not Available |
| Indian Creek Upper Caribou County | 15 | 1975 | Low | Fair |
| Indian Creek Pond Payette County | 28 | 1990 | Significant | Fair |
| Indian Creek Blaine County | 19 | 1930 | Significant | Fair |
| Idc-Effluent Storage Ada County | 23 | 1998 | Significant | Satisfactory |
| Idaho Falls Upper Powerhouse Dam No 2 Bonneville County | 37 | 1982 | Low | Satisfactory |
| Idaho Falls Upper Diversion Dam No 1 Bonneville County | 28 | 1982 | Low | Satisfactory |
| Idaho Cobalt Wmp Lemhi County | 21 | 2019 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.