Pr-21 Ret. Dam./whitewater Lake is a gravity dam located in Phillips County, Montana, built in 1939. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 1,444 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-21 Ret. Dam./whitewater Lake
The primary purpose of Pr-21 Ret. Dam./whitewater Lake 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 Whitewater.
The dam stands 12 feet tall and stretches 1,444 feet across, creates a reservoir covering 291 acres, has a maximum storage capacity of 494 acre-feet, and collects water from a drainage area of 300 square miles. Completed in 1939, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/24/2017.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | Whitewater |
| River/Stream | Whitewater Ck./milk River |
| Coordinates | 48.81467, -107.62414 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 12 ft |
| Dam Length | 1,444 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 494 acre-ft |
| Max Storage | 494 acre-ft |
| Normal Storage | 3 acre-ft |
| Surface Area | 291 acres |
| Drainage Area | 300 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/24/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03061 |
| Federal ID | MT03061 |
| More Info | State Dam Safety Program |