Weson Reservoir Report
Nearby: Dam #168 Mahan And Hoyt Reservoir
Last Updated: December 19, 2025
Weson, located in Valley County, Montana, is a privately owned irrigation dam constructed in 1951 by the USDA NRCS.
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Summary
This earth dam stands at a height of 22 feet and spans a length of 500 feet, with a maximum storage capacity of 282 acre-feet and a normal storage capacity of 154 acre-feet. Situated on TR-Brazil Creek, Weson serves the primary purpose of irrigation and is regulated by the Montana Department of Natural Resources and Conservation (DNRC).
With a low hazard potential and a condition assessment that is currently not rated, Weson plays a crucial role in supporting agricultural activities in the region. The dam has not undergone any modifications in recent years and does not have an emergency action plan in place. Despite its low risk profile, Weson continues to be a key asset for water resource management in Valley County, providing irrigation water to local farmers and contributing to the sustainability of the surrounding ecosystem.
As an important structure in the region, Weson highlights the intersection of water resource management and climate resilience. Its presence underscores the need for ongoing monitoring and maintenance to ensure its continued functionality and safety in the face of changing environmental conditions. By understanding and supporting the infrastructure like Weson, water resource and climate enthusiasts can play a vital role in safeguarding the sustainability of water systems in Montana and beyond.
Year Completed |
1951 |
Dam Length |
500 |
Dam Height |
22 |
River Or Stream |
TR-BRAZIL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Drainage Area |
1.77 |
Nid Storage |
282 |
Hazard Potential |
Low |
Nid Height |
22 |
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.
Weson