Tedson Reservoir Reservoir Report

Last Updated: December 5, 2025

Tedson Reservoir, located in Dupuyer, Montana, is a privately owned water resource designed primarily for fire protection, stock, and as a small fish pond.


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Summary

Built in 1958, this earth dam stands at a height of 10 feet and has a storage capacity of 315 acre-feet, with a normal storage level of 161 acre-feet. The reservoir covers a surface area of 750 feet and is regulated by the Montana Department of Natural Resources and Conservation.

Despite its low hazard potential and current condition being unrated, Tedson Reservoir plays a crucial role in providing water for fire protection and agricultural purposes in the Pondera County region. The reservoir is also a habitat for small fish species, contributing to the local ecosystem. Interestingly, the reservoir's water source is diffused surface water, highlighting its importance in sustaining the surrounding environment and wildlife.

While Tedson Reservoir may not be as large or well-known as other water bodies, its significance in providing essential resources for both human and ecological needs cannot be overlooked. With ongoing state regulation, inspection, and enforcement in place, this reservoir continues to serve as a vital water source for the community, showcasing the intersection of water resource management and climate resilience in the region.

Year Completed

1958

Dam Length

750

Dam Height

10

River Or Stream

DIFFUSED SURFACE WATER

Primary Dam Type

Earth

Hydraulic Height

10

Nid Storage

315

Hazard Potential

Low

Nid Height

10
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.