Willmore Reservoir Report

Last Updated: December 5, 2025

Willmore is a privately owned earth dam located in Fergus County, Montana, specifically on Crooked Creek.


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Summary

Built in 1946, this dam serves multiple purposes such as fire protection, stock watering, and creating a small fish pond. With a height of 15 feet and a length of 300 feet, Willmore has a storage capacity of 63 acre-feet, making it a vital resource for the local community. Despite its low hazard potential, the dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular inspections, enforcement, and permitting to ensure its safety and compliance with state regulations.

Situated in a picturesque location with a latitude of 47.4826 and longitude of -108.7457, Willmore not only provides essential water resources but also contributes to the local ecosystem and biodiversity. As part of the Omaha District within Congressional District 00 of Montana, this dam is under the jurisdiction of the state and is subject to state regulatory agencies for oversight and management. With a primary focus on serving the community's needs for water supply and protection against fires, Willmore stands as a testament to responsible water management and conservation efforts in the region.

While Willmore's condition assessment is currently "Not Rated," its emergency action plan (EAP) status and risk assessment measures are not available in the data. However, with its maintenance history and low hazard potential, the dam continues to play a crucial role in ensuring water security and environmental sustainability in the area. As water resource and climate enthusiasts, understanding the significance of dams like Willmore in managing water scarcity and promoting ecological balance is essential for building a resilient and sustainable future for our planet.

Year Completed

1946

Dam Length

300

Dam Height

15

River Or Stream

TR-CROOKED CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

63

Hazard Potential

Low

Nid Height

15
       
Seasonal Comparison

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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.