Pr-11 Retention Dam
Pr-11 Retention Dam is a gravity dam located in Phillips County, Montana, built in 1942. It carries a Low hazard potential classification.
About Pr-11 Retention Dam
The primary purpose of Pr-11 Retention 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 Beauchamp Ck./missouri River(r near Fort Peck.
The dam stands 17 feet tall and stretches 294 feet across, creates a reservoir covering 99 acres, has a maximum storage capacity of 529 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1942, the structure is well-established, with more than 75 years of service.
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 08/15/2016.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | Fort Peck |
| River/Stream | Beauchamp Ck./missouri River(r |
| Coordinates | 47.84750, -108.20255 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 17 ft |
| Dam Length | 294 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 529 acre-ft |
| Max Storage | 529 acre-ft |
| Surface Area | 99 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 08/15/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00789 |
| Federal ID | MT00789 |
| More Info | State Dam Safety Program |