Dams in Ada County, Idaho
16Total Dams
4High Hazard
11Significant
Dam Safety in Ada County, Idaho
Ada County has 16 dams tracked in the National Inventory of Dams. Of these, 4 are classified as high hazard — meaning failure would probably cause loss of human life. Another 11 carry a significant hazard classification. Currently, 2 dams have a condition assessment of poor or unsatisfactory.
The average dam in Ada County is 71 years old. The most common purpose is flood risk reduction. The tallest dam is Lucky Peak Dam at 340 ft.
Explore more: Oldest dams in Idaho · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Lucky Peak Dam | High | Not Available | 340 | Flood Risk Reduction | 1955 |
| Swan Falls | High | Satisfactory | 88 | Hydroelectric | 1901 |
| Boise River Diversion Dam | High | Not Available | 68 | Irrigation | 1908 |
| Blacks Creek | High | Fair | 52 | Other | 1915 |
| Stewart Gulch Main Fork | Significant | Satisfactory | 76 | Flood Risk Reduction | 1998 |
| Crane Gulch East Dam | Significant | Satisfactory | 60 | Flood Risk Reduction | 1998 |
| Crane Gulch Main Fork | Significant | Satisfactory | 46 | Flood Risk Reduction | 1998 |
| Hidden Springs Cell 3a | Significant | Satisfactory | 43 | Other | 2007 |
| Orchard | Significant | Poor | 43 | Other | 1902 |
| Stewart Gulch North Fork | Significant | Satisfactory | 38 | Flood Risk Reduction | 1997 |
| Barber | Significant | Poor | 26 | Hydroelectric | 1904 |
| Idc-effluent Storage | Significant | Satisfactory | 23 | Irrigation | 1998 |
| Cottonwood Creek Middle | Significant | Fair | 20 | Flood Risk Reduction | 1961 |
| Cottonwood Creek Upper | Significant | Fair | 18 | Flood Risk Reduction | 1961 |
| Cottonwood Creek Lower | Significant | Fair | 15 | Flood Risk Reduction | 1961 |
| Hubbard Dam | Low | Not Available | 23 | Irrigation | 1902 |