Mccuin Reservoir Report
Nearby: Guttormson #1 Pr-83 Retention Dam
Last Updated: January 11, 2026
Mccuin is a private irrigation dam located in Valley County, Montana, specifically in the city of BEAVERTON.
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Summary
Built in 1930 by the USDA NRCS, this Earth-type dam stands at a height of 10 feet and has a length of 1320 feet. Its primary purpose is irrigation, serving the TR-LARB CREEK and providing a storage capacity of 52 acre-feet, with a normal storage level of 16 acre-feet.
Managed by the DNRC, Mccuin is regulated, inspected, and enforced by the state of Montana, ensuring its safety and compliance with state regulations. With a low hazard potential and a current condition assessment of "Not Rated," Mccuin remains a vital water resource infrastructure for the surrounding area. The dam has not been modified over the years and does not fall under the jurisdiction of the US Army Corps of Engineers.
For water resource and climate enthusiasts, Mccuin offers a glimpse into the historical development of irrigation infrastructure in Montana and the importance of sustainable water management practices. Its location in the scenic Valley County and its role in supporting agricultural activities make it a fascinating subject for those interested in water conservation, dam engineering, and environmental stewardship.
Year Completed |
1930 |
Dam Length |
1320 |
Dam Height |
10 |
River Or Stream |
TR-LARB CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Nid Storage |
52 |
Hazard Potential |
Low |
Nid Height |
10 |
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.
Mccuin