D'Ewart Reservoir Report

Last Updated: December 4, 2025

D'Ewart, located in Wilsall, Montana, is a privately owned irrigation dam designed by USDA NRCS and completed in 1951.


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Summary

This Earth-type dam stands at a height of 10 feet and spans 304 feet in length, with a storage capacity of 52 acre-feet. The dam serves the primary purpose of irrigation, drawing water from a canal connected to Flathead Creek.

Managed by DNRC in Montana, the D'Ewart dam has a low hazard potential and is currently rated as 'Not Rated' in terms of condition assessment. While the dam has not been inspected recently, it is regulated, permitted, and inspected by the state, ensuring its safety and compliance with regulations. It is crucial for water resource and climate enthusiasts to stay informed about the status of dams like D'Ewart to ensure sustainable water management practices and environmental protection in the region.

Year Completed

1951

Dam Length

304

Dam Height

10

River Or Stream

CANAL FROM FLATHEAD CREEK

Primary Dam Type

Earth

Hydraulic Height

10

Drainage Area

1

Nid Storage

52

Hazard Potential

Low

Nid Height

10
       
Seasonal Comparison

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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.