Br-57 is an earth dam located in Blaine County, Montana, built in 1942. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 50 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Br-57
The primary purpose of Br-57 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Silverbow Grazing Assn (private). It impounds the Tr-woody Island Coulee near Harlem.
The dam stands 18 feet tall and stretches 50 feet across, has a maximum storage capacity of 60 acre-feet, and collects water from a drainage area of 8 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 01/01/1962. That was over 64 years ago.
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Location
| State | Montana |
| County | Blaine |
| Nearest City | Harlem |
| River/Stream | Tr-woody Island Coulee |
| Coordinates | 48.82670, -108.85800 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 50 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 57 acre-ft |
| Drainage Area | 8 sq mi |
| Max Discharge | 100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Silverbow Grazing Assn |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 01/01/1962 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00045 |
| Federal ID | MT00045 |
| More Info | State Dam Safety Program |