Dams in Custer County, Idaho
15Total Dams
2High Hazard
4Significant
Dam Safety in Custer County, Idaho
Custer County has 15 dams tracked in the National Inventory of Dams. Of these, 2 are classified as high hazard — meaning failure would probably cause loss of human life. Another 4 carry a significant hazard classification. Currently, 4 dams have a condition assessment of poor or unsatisfactory.
The average dam in Custer County is 63 years old. The most common purpose is other. The tallest dam is Thompson Mtis at 789 ft.
Explore more: Oldest dams in Idaho · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Thompson Mtis | High | Fair | 789 | Tailings | 1982 |
| Mackay | High | Fair | 75 | Other | 1918 |
| Grouse Creek North | Significant | Satisfactory | 110 | Tailings | 1994 |
| Thompson Srd | Significant | Satisfactory | 77 | Water Supply | 1982 |
| Mosquito Flat | Significant | Fair | 58 | Other | 1950 |
| Bar D | Significant | Fair | 26 | Irrigation | 1950 |
| Bradshaw Detention Dam #4 | Low | Not Rated | 49 | Flood Risk Reduction | 1967 |
| Bradshaw Detention Dam #3 | Low | Not Rated | 33 | Flood Risk Reduction | |
| South Fork Detention Dam | Low | Not Rated | 31 | Flood Risk Reduction | |
| Horseshoe | Low | Not Rated | 29 | Flood Risk Reduction | 1967 |
| Lehman Creek Upper | Low | Poor | 22 | Other | 1925 |
| Lehman Creek Lower | Low | Poor | 21 | Recreation | 1999 |
| Summit | Low | Fair | 19 | Irrigation | 1921 |
| Challis Lake | Low | Poor | 19 | Irrigation | 1951 |
| Flying Joseph Dam | Low | Poor | 14 | Other | 2008 |