Dammel Reservoir Reservoir Report

Last Updated: December 5, 2025

Dammel Reservoir, located in Chouteau, Montana, is a privately owned earth dam completed in 1960 for the primary purposes of fire protection, stock, and small fish pond.


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Summary

With a maximum storage capacity of 1,956 acre-feet and a normal storage capacity of 1,038 acre-feet, this reservoir on Flat Creek serves as a vital water resource for the surrounding area. Despite being classified as low hazard potential, the dam's condition assessment is currently not rated, highlighting the need for further inspection and maintenance.

Managed by the Montana Department of Natural Resources and Conservation (DNRC), Dammel Reservoir is subject to state regulation, permitting, inspection, and enforcement. The reservoir's geographical coordinates are 47.7013°N latitude and -110.1458°E longitude, making it a key location for water resource and climate enthusiasts to visit and study. As part of the Omaha District of the US Army Corps of Engineers, Dammel Reservoir plays a crucial role in water management and conservation efforts in the region.

Despite lacking surface area and spillway information, Dammel Reservoir remains a significant feature in Montana's water infrastructure. With its historical significance dating back to the mid-20th century, the reservoir continues to provide essential services to the local community while also serving as a valuable research site for water resource management and climate adaptation strategies.

Year Completed

1960

Dam Length

315

Dam Height

21

River Or Stream

FLAT CREEK

Primary Dam Type

Earth

Hydraulic Height

21

Nid Storage

1956

Hazard Potential

Low

Nid Height

21
       
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.