Chambers Reservoir Report

Last Updated: December 6, 2025

Chambers is a private irrigation dam located in Valley County, Montana, specifically in the city of Hinsdale along the TR-Rock Creek river.


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Summary

Built in 1948, this earth dam stands at a height of 15 feet and has a length of 700 feet, providing a storage capacity of 891 acre-feet for irrigation purposes. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is considered to have a low hazard potential.

Despite being classified as "Not Rated" in terms of condition assessment, Chambers has not undergone recent inspections or evaluations. However, it is maintained to meet state regulatory standards for operation, inspection, and enforcement. The dam has not been modified or equipped with specific risk management measures, and emergency preparedness protocols such as an Emergency Action Plan (EAP) and inundation maps are not currently in place. With its strategic location in the Omaha District and Congressional District 00 of Montana, Chambers serves as a vital water resource for the local agricultural community, highlighting the importance of monitoring and maintaining its structural integrity for long-term sustainability.

Year Completed

1948

Dam Length

700

Dam Height

15

River Or Stream

TR-ROCK CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

891

Hazard Potential

Low

Nid Height

15
       
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.
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