Lars Reservoir Report

Last Updated: December 5, 2025

Lars is a private irrigation dam located in Flowerree, Montana, along the Huntley Coulee river stream.


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Summary

Constructed in 1950, this earth dam stands at 66 feet in height and spans 580 feet in length. With a storage capacity of 18 acre-feet, Lars serves the primary purpose of irrigation for agricultural needs in the region.

Managed by the Montana Department of Natural Resources and Conservation (DNRC), Lars is regulated and inspected by the state, ensuring its safety and compliance with regulations. The dam is classified as low hazard potential and has not been rated for condition assessment. While it has not been modified in recent years, Lars plays a crucial role in water resource management in Chouteau County, Montana.

For water resource and climate enthusiasts, Lars represents a vital piece of infrastructure that supports agricultural activities in the region. Its presence along the Huntley Coulee river stream highlights the importance of dams in providing water for irrigation and emphasizes the need for proper maintenance and regulation to ensure the safety of the surrounding community and environment.

Year Completed

1950

Dam Length

580

Dam Height

66

River Or Stream

HUNTLEY COULEE

Primary Dam Type

Earth

Hydraulic Height

66

Nid Storage

18

Hazard Potential

Low

Nid Height

66
       
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.