Reagan Lake Reservoir Report

Last Updated: January 11, 2026

Reagan Lake, located in Glacier, Montana, is a privately owned water resource managed by the USDA NRCS.


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Summary

Built in 1967 for irrigation purposes, this earth dam stands at a height of 37 feet with a hydraulic height of 33 feet, providing a storage capacity of 74 acre-feet. The dam spans 290 feet in length and is regulated by the Montana DNRC, ensuring proper permitting, inspection, and enforcement to maintain its integrity.

Situated on TR-ROCKY COULEE, Reagan Lake serves as a vital water source for agricultural irrigation in the region. With a low hazard potential and a condition assessment of 'Not Rated', the dam's emergency action plan status and risk management measures remain unspecified. Despite lacking certain details like inspection dates and emergency preparedness guidelines, Reagan Lake stands as a testament to responsible water management in the area.

Managed by private owners and falling under state jurisdiction, Reagan Lake represents a harmonious balance between human resource needs and environmental conservation. Its historical significance, coupled with its functional efficiency, makes it a noteworthy site for water resource and climate enthusiasts seeking to understand the intricate interplay between human intervention and natural ecosystems.

Year Completed

1967

Dam Length

290

Dam Height

37

River Or Stream

TR-ROCKY COULEE

Primary Dam Type

Earth

Hydraulic Height

33

Drainage Area

1.88

Nid Storage

74

Hazard Potential

Low

Nid Height

37
       
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.