Delaney #2 Reservoir Report
Nearby: Cooper-Adams #5 Cooper-Adams #4
Last Updated: December 5, 2025
Delaney #2, located in Petroleum County, Montana, is a private earth dam completed in 1959 for fire protection, stock, and small fish pond purposes.
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Summary
With a height of 20 feet and a storage capacity of 124 acre-feet, this low hazard potential structure plays a crucial role in water resource management in the area. The dam is regulated and inspected by the Montana Department of Natural Resources and Conservation, ensuring its safety and compliance with state regulations.
Situated on the TR-South Fork Bear Creek, Delaney #2 serves as a valuable water source for the surrounding community of Mosby. Despite not being rated for its condition assessment, the dam's primary purpose of fire protection highlights its importance in mitigating the risks of wildfires in the region. With a normal storage capacity of 63 acre-feet, this structure plays a vital role in supporting agriculture, wildlife, and emergency response efforts in the area.
While the dam does not have a designated emergency action plan or inundation maps prepared, its construction and maintenance fall under the jurisdiction of the state regulatory agency. As climate change continues to impact water resources and weather patterns, the importance of structures like Delaney #2 in ensuring water availability and safety becomes even more pronounced. This earth dam stands as a testament to the intersection of water resource management and climate resilience in the region.
Year Completed |
1959 |
Dam Length |
300 |
Dam Height |
20 |
River Or Stream |
TR-SOUTH FORK BEAR CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
124 |
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.
Delaney #2