Coal Creek Drop Dam
Coal Creek Drop Dam is a gravity dam located in Prairie County, Montana. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Coal Creek Drop Dam
The primary purpose of Coal Creek Drop 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 Coal Creek.
The dam stands 31 feet tall and stretches 2,369 feet across, creates a reservoir covering 32 acres, has a maximum storage capacity of 98 acre-feet, and collects water from a drainage area of 12 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/05/2018.
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Location
| State | Montana |
| County | Prairie |
| River/Stream | Coal Creek |
| Coordinates | 46.83915, -105.22442 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 31 ft |
| Dam Length | 2,369 ft |
Storage & Hydraulics
| NID Storage | 98 acre-ft |
| Max Storage | 98 acre-ft |
| Normal Storage | 13 acre-ft |
| Surface Area | 32 acres |
| Drainage Area | 12 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/05/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00655 |
| Federal ID | MT00655 |
| More Info | State Dam Safety Program |