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 1–25 of 76
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Andreasen Lower Franklin County | 33 | 1960 | Significant | Satisfactory |
| Ashton Fremont County | 65 | 1917 | High | Satisfactory |
| Beartrack H2o Overflow Pond Lemhi County | 52 | 1995 | Low | Satisfactory |
| Beartrack Treatment Lagoon Lemhi County | 20 | 1995 | Low | Satisfactory |
| Blackfoot Bridge Wmp #1 & #2 Caribou County | 35 | 2012 | Significant | Satisfactory |
| Bliss Gooding County | 140 | 1950 | High | Satisfactory |
| Buffalo River Fremont County | 12 | 1936 | Low | Satisfactory |
| Cabinet Gorge Bonner County | 177 | 1952 | High | Satisfactory |
| China Hat Dike Caribou County | 29 | 1923 | High | Satisfactory |
| City Diversion Bonneville County | 30 | 1982 | Low | Satisfactory |
| C J Strike Owyhee County | 115 | 1952 | High | Satisfactory |
| Conda Site Mtis (Simplot) Caribou County | 45 | 1979 | Significant | Satisfactory |
| Condie Franklin County | 41 | 1948 | Significant | Satisfactory |
| Crane Gulch East Dam Ada County | 60 | 1998 | Significant | Satisfactory |
| Crane Gulch Main Fork Ada County | 46 | 1998 | Significant | Satisfactory |
| Cross Cut Diversion Fremont County | 18 | 1938 | Low | Satisfactory |
| Current Creek Bannock County | 49 | 1977 | Significant | Satisfactory |
| Delamar Wmp-1 Owyhee County | 42 | 2009 | Low | Satisfactory |
| Dewey Cassia County | 30 | 1913 | Significant | Satisfactory |
| Deyo Clearwater County | 41 | 2011 | Significant | Satisfactory |
| Egin Canal Diversion Fremont County | 7 | 1903 | Low | Satisfactory |
| Enders Caribou County | 13 | — | Low | Satisfactory |
| Five Mile Erosion Contr Franklin County | 44 | 1952 | Low | Satisfactory |
| Gem State Bonneville County | 40 | 1988 | High | Satisfactory |
| Gem State Left Dike Bonneville County | 30 | 1988 | High | Satisfactory |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.