Dewry Reservoir Report
Nearby: Arther Dengel #1 Jelly Bean
Last Updated: December 5, 2025
Dewry is a privately owned dam located in Fergus, Montana, near the city of Teigen.
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Summary
Completed in 1960, this earth dam stands at a height of 15 feet and has a storage capacity of 81 acre-feet, primarily used for fire protection, stock, and small fish ponds along the TR-North McDonald Creek. Despite its low hazard potential, Dewry is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular state inspections and enforcement to ensure its safety and compliance with regulatory standards.
Situated in Congressional District 00 of Montana, Dewry plays a vital role in providing essential water resources for the surrounding area. The dam's location at coordinates 47.0819° N, 108.7727° W not only serves practical purposes but also contributes to the overall ecological balance of the region. With a primary purpose of fire protection and stock, Dewry reflects the intersection of human needs and environmental stewardship, showcasing the importance of sustainable water management in the face of changing climatic conditions.
As water resource and climate enthusiasts, the data on Dewry offers a fascinating glimpse into the intricate network of infrastructure, regulation, and ecological significance that shape our water systems. From its construction history to its current condition assessment and emergency preparedness, Dewry stands as a testament to the careful balance between human development and natural resource conservation. By understanding and appreciating the complexities of dams like Dewry, we can work towards a more sustainable future for water resources and climate resilience in Montana and beyond.
Year Completed |
1960 |
Dam Length |
300 |
Dam Height |
15 |
River Or Stream |
TR-NORTH MCDONALD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
81 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Dewry