Cooper-Adams #5 Reservoir Report
Last Updated: December 5, 2025
Cooper-Adams #5 is a privately owned earth dam located in Mosby, Montana, along the TR-Bear Creek.
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Summary
Completed in 1950, this dam primarily serves the purposes of fire protection, stock, and small fish pond. With a height of 12.8 feet and a storage capacity of 470 acre-feet, it covers a surface area of 59 acres and drains an area of 80 square miles.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Cooper-Adams #5 is classified as having a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. While lacking specific details on inspections and emergency preparedness, the dam remains under state jurisdiction and regulation, ensuring that it meets safety standards for its intended purposes. The dam has not been modified over the years, indicating a stable and consistent operational history.
Located in Congressional District 00, Montana, Cooper-Adams #5 is a significant water resource for the local community, providing essential services for agricultural and fire protection needs. With its historic construction and enduring functionality, this dam represents a valuable asset in the region's water management infrastructure, contributing to the conservation and utilization of water resources in Fergus County.
Year Completed |
1950 |
Dam Length |
685 |
Dam Height |
12.8 |
River Or Stream |
TR-BEAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
59 |
Hydraulic Height |
8.46 |
Drainage Area |
80 |
Nid Storage |
470 |
Hazard Potential |
Low |
Nid Height |
13 |
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.
Cooper-Adams #5