Flat Retention Dam / Mister Bill Dam
Flat Retention Dam / Mister Bill Dam is a gravity dam located in Phillips County, Montana, built in 1973. It carries a Low hazard potential classification and has a unsatisfactory condition assessment.
About Flat Retention Dam / Mister Bill Dam
The primary purpose of Flat Retention Dam / Mister Bill Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Doi Blm (federal). It impounds the Beaver Ck./milk River near Saco.
The dam stands 16 feet tall and stretches 1,553 feet across, creates a reservoir covering 181 acres, has a maximum storage capacity of 1,537 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1973, the structure is well into its service life at over 50 years old.
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 unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. The most recent inspection on record was 08/16/2016.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | Saco |
| River/Stream | Beaver Ck./milk River |
| Coordinates | 47.93900, -107.82742 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 16 ft |
| Dam Length | 1,553 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 1,537 acre-ft |
| Max Storage | 1,537 acre-ft |
| Surface Area | 181 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 08/16/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03163 |
| Federal ID | MT03163 |
| More Info | State Dam Safety Program |