Black Coulee Reservoir Reservoir Report
Nearby: Lee #6 Cherry Creek
Last Updated: January 11, 2026
Black Coulee Reservoir in Montana, also known as the South Prong Black Coulee, is a state-regulated dam constructed in 1962 for fire protection, stock, and as a small fish pond.
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Summary
With a dam height of 20 feet and a storage capacity of 62 acre-feet, this earth dam serves as a vital resource for water management in Rosebud County. Located in Congressional District 00, Montana, the reservoir is owned and regulated by the Montana Department of Natural Resources and Conservation (DNRC).
The Black Coulee Reservoir has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite lacking certain inspection and emergency preparedness data, the reservoir remains a crucial asset for water supply and wildlife in the area. With its strategic location and purpose, this reservoir plays a key role in supporting local communities and ecosystems. Enthusiasts of water resources and climate will appreciate the significance of the Black Coulee Reservoir in maintaining water security and ecological balance in the region.
As a state-owned and managed structure, the Black Coulee Reservoir stands as a testament to Montana's commitment to water resource management and conservation. While certain details like inspection frequency and emergency response protocols may need further development, the reservoir continues to provide essential services for fire protection, livestock, and aquatic life. Its role in supporting sustainable water use and environmental protection makes it a valuable asset for both the local community and the broader ecosystem.
Year Completed |
1962 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
SOUTH PRONG BLACK COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Black Coulee Reservoir