Mcglynn Reservoir Reservoir Report
Last Updated: December 13, 2025
Mcglynn Reservoir, located in Richland County, Montana, serves as a crucial water source for irrigation purposes in the region.
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Summary
With a maximum storage capacity of 412 acre-feet and a normal storage level of 261 acre-feet, the reservoir covers a surface area of 30.4 acres and has a drainage area of 3.6 square miles. Completed in 1939, the earth dam stands at a height of 26 feet and has a hydraulic height of 21.5 feet, providing essential water resources for agricultural activities in the area.
Managed by a private owner, Mcglynn Reservoir is regulated by the Montana Department of Natural Resources and Conservation (DNRC), ensuring compliance with state permitting, inspection, and enforcement procedures. Despite its low hazard potential, the dam's condition assessment is currently marked as "Not Rated," indicating a need for further evaluation to ensure the safety and stability of the structure. With a primary purpose of irrigation, the reservoir plays a vital role in sustaining water availability for local farmers and supporting agricultural productivity in the region.
Situated along the TR-Bennie Peer Creek, Mcglynn Reservoir not only contributes to water resource management but also enhances the overall environmental and economic sustainability of the area. As climate change continues to impact water availability and quality, the efficient operation and maintenance of this reservoir are essential for ensuring a reliable water supply for agricultural activities and mitigating the effects of changing climatic conditions in the region.
Year Completed |
1939 |
Dam Length |
325 |
Dam Height |
26 |
River Or Stream |
TR-BENNIE PEER CREEK |
Primary Dam Type |
Earth |
Surface Area |
30.4 |
Hydraulic Height |
21.5 |
Drainage Area |
3.6 |
Nid Storage |
412 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Mcglynn Reservoir