Muri #4 Reservoir Report

Last Updated: December 6, 2025

Muri #4 is a privately owned earth dam located in Miles City, Montana, along the TR-Johnson Creek.


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Summary

It was completed in 1960 and serves multiple purposes including fire protection, stock watering, and small fish pond. The dam has a height of 20 feet and a storage capacity of 57 acre-feet, with a maximum discharge capacity of 57 cfs. Despite its low hazard potential, the dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular inspections and enforcement measures to ensure its safety and compliance with state regulations.

The dam's location in Custer County, Montana, makes it a vital water resource for the surrounding area, providing essential services for agriculture, emergency response, and wildlife habitat. Its proximity to Miles City underscores its importance for local residents and businesses, as well as its role in maintaining the ecological balance of the TR-Johnson Creek watershed. The dam's condition assessment is currently listed as "Not Rated," indicating a need for further evaluation to determine its long-term durability and effectiveness in managing water resources in the region.

As a key infrastructure element in the region's water management system, Muri #4 represents a critical link between human communities and natural ecosystems. Its design and construction reflect the evolving understanding of water resource management and the need to balance human needs with environmental sustainability. By staying informed about its status and participating in regulatory processes, water resource and climate enthusiasts can help ensure the continued safety and functionality of Muri #4 for future generations.

Year Completed

1960

Dam Length

225

Dam Height

20

River Or Stream

TR-JOHNSON CREEK

Primary Dam Type

Earth

Hydraulic Height

20

Nid Storage

57

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.