W C Eustance #1 Reservoir Report

Last Updated: December 5, 2025

Located in the picturesque city of Black Eagle, Montana, W C Eustance #1 is a privately owned dam primarily used for fire protection, stock, or as a small fish pond.


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Summary

Completed in 1945, this earth dam stands at a height of 14 feet and has a length of 150 feet. With a storage capacity of 63 acre-feet, this structure serves the local community while also being a valuable asset for water resource management in the region.

Situated on the TR-Missouri River, W C Eustance #1 is under state regulation and jurisdiction, with the Department of Natural Resources and Conservation (DNRC) overseeing permitting, inspection, and enforcement activities. Despite being classified as having a low hazard potential, the dam's condition has not been rated, and there are currently no emergency action plans in place. However, the structure continues to play a vital role in safeguarding the surrounding area against fires and providing essential water resources for livestock and recreational purposes.

As a key feature in the local landscape, W C Eustance #1 represents a blend of functionality and environmental stewardship. While its design and purpose cater to practical needs such as fire protection and stock watering, the dam also contributes to the overall resilience of the ecosystem by providing a habitat for small fish and serving as a source of recreation for the community. With its historical significance and ongoing relevance in water resource management, this structure stands as a testament to the intersection of human ingenuity and natural beauty in the Montana wilderness.

Year Completed

1945

Dam Length

150

Dam Height

14

River Or Stream

TR-MISSOURI RIVER

Primary Dam Type

Earth

Hydraulic Height

14

Nid Storage

63

Hazard Potential

Low

Nid Height

14
       
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.