Adams #2 Reservoir Report
Last Updated: December 5, 2025
Adams #2 is a privately owned earth dam located in Mosby, Montana, designed by the USDA NRCS and completed in 1960.
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Summary
The dam serves multiple purposes including fire protection, stock, and a small fish pond, with a storage capacity of 830 acre-feet and a normal storage of 356 acre-feet. It is situated on TR-Bear Creek, with a drainage area of 80 square miles and a surface area of 79 acres.
This low hazard potential dam has an uncontrolled spillway with a width of 100 feet and a hydraulic height of 11.2 feet. While it has not been rated for condition assessment, the risk assessment for Adams #2 is moderate (3). The last inspection dates back to 1979, and it falls under the jurisdiction of the DNRC with state permitting, inspection, and enforcement in place.
Overall, Adams #2 contributes to water resource management in the region, providing essential services for fire protection and livestock, as well as recreational opportunities for small fish ponds. With its location in a picturesque setting and its historical significance dating back to the 1960s, this dam plays a crucial role in the local ecosystem and the surrounding community.
Year Completed |
1960 |
Dam Length |
1803 |
Dam Height |
16 |
River Or Stream |
TR-BEAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
79 |
Hydraulic Height |
11.2 |
Drainage Area |
80 |
Nid Storage |
830 |
Hazard Potential |
Low |
Nid Height |
16 |
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.
Adams #2