Deminish Reservoir Report
Last Updated: December 5, 2025
Deminish is a privately owned earth dam located in Teton County, Montana, near the city of Bynum.
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Summary
Built in 1952, this dam serves multiple purposes, including fire protection, stock watering, and creating a small fish pond. With a height of 10 feet and a length of 300 feet, Deminish has a storage capacity of 217 acre-feet and a normal storage level of 111 acre-feet. The dam is situated on TR-Muddy Creek and is regulated by the Montana Department of Natural Resources and Conservation (DNRC).
Despite its low hazard potential, Deminish has not been officially rated for its condition. The dam has not been inspected in recent years, and there is no established inspection frequency or emergency action plan in place. While the risk assessment and management measures for the dam remain unspecified, it is essential for water resource and climate enthusiasts to monitor the condition of this structure to ensure its continued safety and functionality. Additionally, with the potential impacts of climate change on water resources, it is crucial to assess and address any vulnerabilities of dams like Deminish to safeguard against potential risks in the future.
Year Completed |
1952 |
Dam Length |
300 |
Dam Height |
10 |
River Or Stream |
TR-MUDDY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Nid Storage |
217 |
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.
Deminish