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 351–375 of 395
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Buffalo River Fremont County | 12 | 1936 | Low | Satisfactory |
| Brundage Adams County | 63 | 1936 | High | Fair |
| Bruce Washington County | 24 | 1980 | Significant | Fair |
| Brown Owyhee County | 26 | 1958 | Low | Fair |
| Brown Valley County | 21 | 1979 | Low | Fair |
| Bray Lake Gooding County | 36 | 1915 | Significant | Fair |
| Bradshaw Detention Dam #4 Custer County | 49 | 1967 | Low | Not Rated |
| Bradshaw Detention Dam #3 Custer County | 33 | — | Low | Not Rated |
| Brace Owyhee County | 25 | 1921 | Undetermined | Not Rated |
| Box Lake Valley County | 13 | 1935 | Low | Fair |
| Boulder Meadow Valley County | 35 | 1968 | Significant | Poor |
| Boulder Lake Valley County | 15 | 1902 | Significant | Fair |
| Boise River Diversion Dam Ada County | 68 | 1908 | High | Not Available |
| Boggeman Lemhi County | 24 | 1963 | Significant | Fair |
| Blue Creek Upper Fremont County | 18 | 1920 | Low | Fair |
| Bliss Gooding County | 140 | 1950 | High | Satisfactory |
| Blanchard Creek Bonner County | 19 | 1910 | Significant | Poor |
| Blacks Creek Ada County | 52 | 1915 | High | Fair |
| Blackhawk Lake Valley County | 45 | 1968 | Significant | Fair |
| Blackfoot Bridge Wmp #1 & #2 Caribou County | 35 | 2012 | Significant | Satisfactory |
| Blackfoot Caribou County | 54 | 1911 | High | Fair |
| Black Canyon Diversion Dam Gem County | 183 | 1924 | High | Not Available |
| Bird Pond Lemhi County | 17 | 2010 | Low | Fair |
| Billy Creek Lemhi County | 16 | 1916 | Low | Poor |
| Big Blue Creek Owyhee County | 34 | 1910 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.