Deianira Reservoir Report
Nearby: Deuteronomy Coffee Mate
Last Updated: December 5, 2025
Deianira, a private water resource located in Chouteau, Montana, is a crucial structure for fire protection, stock, and small fish pond purposes.
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Summary
Built in 1960, this earth dam stands at a height of 20 feet and has a storage capacity of 93 acre-feet. Situated on Cowboy Creek, Deianira is regulated by the Montana Department of Natural Resources and Conservation (DNRC), ensuring state jurisdiction, permitting, inspection, and enforcement.
With a low hazard potential and a condition assessment of "Not Rated," Deianira serves as a reliable water resource in the region. Despite lacking certain details such as spillway type and maximum discharge, this dam continues to provide essential services to the local community. The structure's emergency action plan status, risk assessment, and management measures are currently undetermined, suggesting a need for further evaluation and preparedness.
As a part of the Omaha District and under the ownership of a private entity, Deianira remains a vital component of water management in the area. Its location, design, and purpose make it a key asset for maintaining water resources and supporting various uses. Climate and water enthusiasts can appreciate the significance of Deianira in preserving water quality, protecting against fires, and sustaining livestock and aquatic habitats in the region.
Year Completed |
1960 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
COWBOY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
93 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Judith River Nr Mouth
|
368cfs |
Missouri River At Fort Benton Mt
|
4720cfs |
Teton River At Loma Mt
|
30cfs |
Missouri River At Virgelle Mt
|
4820cfs |
Marias River Near Loma Mt
|
335cfs |
Belt Creek Near Monarch Mt
|
14cfs |
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.
Deianira