Lockie #5 Reservoir Report

Last Updated: December 6, 2025

Lockie #5 is a privately owned dam located in Miles City, Montana, along the West Fork Moon Creek.


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Summary

Built in 1961, the earth dam stands at a height of 31 feet and has a storage capacity of 203 acre-feet, primarily serving fire protection, stock, and small fish pond purposes. While the dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes state inspections and enforcement, it has a low hazard potential and its condition assessment is currently not rated.

With a lack of associated structures and a minimal risk of potential hazards, Lockie #5 remains a key component in the water resource infrastructure of Custer County, Montana. While its emergency action plan (EAP) status and risk assessment details are currently undisclosed, the dam plays a crucial role in supporting the local community's water needs and ecosystem health. As water resource and climate enthusiasts continue to monitor and advocate for sustainable water management practices, Lockie #5 stands as a testament to the importance of maintaining and regulating our water infrastructure for the benefit of all.

Year Completed

1961

Dam Length

310

Dam Height

31

River Or Stream

WEST FORK MOON CREEK

Primary Dam Type

Earth

Hydraulic Height

31

Nid Storage

203

Hazard Potential

Low

Nid Height

31
       
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.