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 101–125 of 395
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Scrappy Creek Owyhee County | 20 | 1927 | Low | Poor |
| Scott Creek Washington County | 20 | 1977 | Significant | Fair |
| Samaria No 2 Upper Oneida County | 46 | 1947 | Significant | Fair |
| Samaria No 1 Lower Oneida County | 35 | 1934 | Significant | Fair |
| Salmon Falls Creek Twin Falls County | 13 | 1956 | Low | Satisfactory |
| Salmon Falls Twin Falls County | 224 | 1911 | High | Fair |
| Saint John Oneida County | 43 | 1918 | High | Unsatisfactory |
| Sage Hen Gem County | 46 | 1939 | Significant | Fair |
| Rundell Idaho County | 19 | 1975 | Significant | Satisfactory |
| Rock Creek Owyhee County | 37 | 1965 | Significant | Fair |
| Ririe Dam Bonneville County | 253 | 1977 | High | Not Available |
| Rio Vista Valley County | 20 | 1971 | Significant | Fair |
| Rhead Ranch Elmore County | 34 | 1974 | Low | Satisfactory |
| Reservoir A Dam Nez Perce County | 61 | 1907 | High | Not Available |
| Ravenscroft Diversion Gooding County | 10 | 1983 | Low | Satisfactory |
| Priest Lake Bonner County | 12 | 1979 | Significant | Fair |
| Post Falls South Channel Kootenai County | 25 | 1906 | High | Satisfactory |
| Post Falls North Channel Kootenai County | 31 | 1906 | High | Fair |
| Post Falls Earth Dike Kootenai County | 16 | 1990 | High | Satisfactory |
| Portneuf Wellness Complex | 39 | 2014 | Significant | Satisfactory |
| Portneuf Caribou County | 55 | 1912 | High | Fair |
| Poro Valley County | 22 | 1947 | Low | Fair |
| Point of Rock Cassia County | 30 | 2004 | Significant | Satisfactory |
| Pitkin Valley County | 21 | 1974 | Significant | Fair |
| Pioneer Gooding County | 15 | 1910 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.