Pr-88 Retention Dam is a gravity dam located in Phillips County, Montana, built in 1936. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 324 ft long. 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 Pr-88 Retention Dam
The primary purpose of Pr-88 Retention 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 Whitewater Ck./milk River near Hinsdale.
The dam stands 16 feet tall and stretches 324 feet across, creates a reservoir covering 80 acres, has a maximum storage capacity of 233 acre-feet, and collects water from a drainage area of 60 square miles. Completed in 1936, 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 08/17/2016. That was over 10 years ago.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | Hinsdale |
| River/Stream | Whitewater Ck./milk River |
| Coordinates | 48.93908, -107.55389 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 16 ft |
| Dam Length | 324 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 233 acre-ft |
| Max Storage | 233 acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 60 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/17/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00792 |
| Federal ID | MT00792 |
| More Info | State Dam Safety Program |