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 26–50 of 76
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Post Falls Earth Dike Kootenai County | 16 | 1990 | High | Satisfactory |
| Portneuf Wellness Complex | 39 | 2014 | Significant | Satisfactory |
| Point of Rock Cassia County | 30 | 2004 | Significant | Satisfactory |
| Nouque Owyhee County | 21 | 1967 | Low | Satisfactory |
| Nelson Latah County | 17 | 1907 | Low | Satisfactory |
| Milner Dam-Middle Twin Falls County | 80 | 1905 | High | Satisfactory |
| Lucky Friday No 4 Shoshone County | 132 | 2010 | High | Satisfactory |
| Lower Salmon Gooding County | 110 | 1949 | High | Satisfactory |
| Lower Diversion Bonneville County | 14 | 1982 | Low | Satisfactory |
| Little Crane Creek Washington County | 33 | 1908 | Low | Satisfactory |
| Kinyon Pond Dam Twin Falls County | 13 | 2014 | Low | Satisfactory |
| Juniper Creek Owyhee County | 16 | 1923 | Low | Satisfactory |
| J-Canal Reregulating Cassia County | 19 | 1994 | Significant | Satisfactory |
| Itafos Tailings Pond #4 Caribou County | 71 | 1985 | Significant | Satisfactory |
| Itafos Cooling Pond Caribou County | 20 | 1995 | High | Satisfactory |
| 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 |
| Holbrook Valley County | 17 | 1955 | Low | Satisfactory |
| Hidden Springs Cell 3a Ada County | 43 | 2007 | Significant | Satisfactory |
| Hells Canyon Adams County | 330 | 1967 | High | Satisfactory |
| Haul Road Pond (Monsanto) Caribou County | 30 | 2009 | Low | Satisfactory |
| Hardisty Wilson East Owyhee County | 9 | 1918 | Low | Satisfactory |
| Hansen Latah County | 18 | 1976 | Significant | Satisfactory |
| Grouse Creek North Custer County | 110 | 1994 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.