South Fork Detention Dam is a gravity dam located in Custer County, Idaho. It carries a Low hazard potential classification.
Dam profile
NID height · 31 ft31 ft tall and 340 ft long, taller than 72% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About South Fork Detention Dam
The primary purpose of South Fork Detention Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Doi BLM (federal). It impounds the Bradshaw Basin near Rural Ranch.
The dam stands 31 feet tall and stretches 340 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 30 acre-feet, and collects water from a drainage area of 3 square miles.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 07/18/2012. That was over 14 years ago.
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Location
| State | Idaho |
| County | Custer |
| Nearest City | Rural Ranch |
| River/Stream | Bradshaw Basin |
| Coordinates | 44.29433, -114.22233 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 31 ft |
| Dam Length | 340 ft |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 24 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 220 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/18/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00462 |
| Federal ID | ID00462 |
| More Info | State Dam Safety Program |