Eureka Reservoir West Dike Reservoir Report
Nearby: Eureka Reservoir Dam Decuman
Last Updated: December 5, 2025
Eureka Reservoir West Dike in Montana, completed in 1936, is a key infrastructure for irrigation purposes, with a storage capacity of 6800 acre-feet.
°F
°F
mph
Wind
%
Humidity
Summary
Located on the Teton River offstream in Choteau, the earth dam stands at 12 feet in height and stretches 1180 feet in length, serving as a vital resource for the surrounding agricultural community. The reservoir covers a surface area of 390 acres and has a drainage area of 1.8 square miles, with a maximum discharge capacity of 4400 cubic feet per second.
Managed by a private entity, the dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) with regular inspections conducted every five years. Despite being classified as having a high hazard potential, the condition assessment of the structure was deemed satisfactory during the last inspection in June 2018. With its strategic location and significant water storage capacity, Eureka Reservoir West Dike plays a crucial role in ensuring water availability for irrigation needs in the region, contributing to the overall water resource management efforts in Montana.
Year Completed |
1936 |
Dam Length |
1180 |
Dam Height |
12 |
River Or Stream |
TETON RIVER OFFSTREAM |
Primary Dam Type |
Earth |
Surface Area |
390 |
Hydraulic Height |
12 |
Drainage Area |
1.8 |
Nid Storage |
6800 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
12 |
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 West Dike