Eureka Reservoir Dam Reservoir Report
Nearby: Eureka Reservoir West Dike Decuman
Last Updated: December 5, 2025
Eureka Reservoir Dam, located in Choteau, Montana, serves as a crucial water resource for irrigation in the region.
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Summary
Completed in 1936, this private earth dam stands at a height of 32 feet and has a maximum storage capacity of 6,800 acre-feet. The reservoir has a normal storage capacity of 5,500 acre-feet and covers a surface area of 390 acres, drawing water from the Teton River offstream.
Despite its important role in supporting local agriculture, the dam's condition assessment is rated as poor, with a high hazard potential. The last inspection in April 2018 revealed the need for maintenance and repairs. With a moderate risk rating of 3, there are concerns about the overall safety and stability of the structure. In the event of an emergency, the dam's emergency action plan (EAP) status is unclear, highlighting the need for updated guidelines and preparedness measures to mitigate potential risks and ensure the safety of surrounding communities and ecosystems.
Year Completed |
1936 |
Dam Length |
1700 |
Dam Height |
32 |
River Or Stream |
TETON RIVER OFFSTREAM |
Primary Dam Type |
Earth |
Surface Area |
390 |
Hydraulic Height |
29 |
Drainage Area |
1.8 |
Nid Storage |
6800 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
32 |
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.
Eureka Reservoir Dam