Crow #47 Reservoir Report

Last Updated: December 5, 2025

Crow #47 is a private dam located in Crow Agency, Montana, along Onion Creek.


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Summary

Built in 1959, this earth dam stands at 18 feet high and serves multiple purposes including fire protection, stock, and a small fish pond. With a storage capacity of 59 acre-feet and a normal storage of 28 acre-feet, this dam plays a crucial role in water management in the area.

Managed by the Montana Department of Natural Resources and Conservation, this low-hazard dam has not been rated for its condition. Despite its age, Crow #47 continues to provide essential services to the local community. Situated in a scenic location in Big Horn County, this dam is a testament to the importance of water resource management and climate resilience in the region.

As water resource and climate enthusiasts, it is vital to recognize the significance of structures like Crow #47 in ensuring water security and ecosystem sustainability. By understanding the design, purpose, and regulatory aspects of such dams, we can appreciate the intricate balance between human needs and environmental protection that these structures embody. Crow #47 stands as a symbol of responsible water management and serves as a reminder of the ongoing efforts to safeguard our natural resources for future generations.

Year Completed

1959

Dam Length

125

Dam Height

18

River Or Stream

ONION CREEK

Primary Dam Type

Earth

Hydraulic Height

18

Nid Storage

59

Hazard Potential

Low

Nid Height

18
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.
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Area Campgrounds