Cimrhakl #4 Reservoir Report

Last Updated: December 5, 2025

Located in Fergus County, Montana, Cimrhakl #4 is a privately owned earth dam completed in 1920 for the primary purposes of fire protection, stock, and small fish pond.


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Summary

With a dam height and hydraulic height of 20 feet, this structure has a storage capacity of 62 acre-feet and a normal storage of 32 acre-feet. Situated on Tomty Coulee, this low-hazard dam serves as a vital resource for water management and conservation in the area.

Managed by the Montana Department of Natural Resources and Conservation (DNRC), Cimrhakl #4 is regulated, permitted, inspected, and enforced by the state, ensuring its safe operation and maintenance. Although the dam's condition assessment is currently not rated, its hazard potential is classified as low. Although the structure has not been modified in recent years, it remains a crucial asset for local water supply and emergency preparedness efforts.

As a key component of the water infrastructure in the region, Cimrhakl #4 plays a vital role in mitigating the impact of climate change on water resources. With its strategic location and purposeful design, this dam serves as a valuable resource for fire protection, agricultural needs, and ecological conservation. Enthusiasts interested in water resource management and climate resilience will find Cimrhakl #4 to be a fascinating case study in sustainable water infrastructure development and management.

Year Completed

1920

Dam Length

230

Dam Height

20

River Or Stream

TOMTY COULEE

Primary Dam Type

Earth

Hydraulic Height

20

Nid Storage

62

Hazard Potential

Low

Nid Height

20
       
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.