Dioscuri Reservoir Report
Nearby: Djokjakarta Pollux
Last Updated: December 5, 2025
Dioscuri is a privately owned dam located in Loma, Montana, on the Goose Bill Coulee.
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Summary
Built in 1955 for purposes including fire protection, stock, and small fish ponds, this earth dam stands at a height of 15 feet and spans 200 feet in length. With a storage capacity of 54 acre-feet, Dioscuri serves as a vital resource for the local community while also providing low hazard potential according to assessments.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Dioscuri is subject to state regulations, inspections, and enforcement to ensure its safe operation. Despite being in operation for several decades, the dam's condition is currently rated as "Not Rated," suggesting a need for further evaluation. The dam's emergency action plan status, risk assessment, and management measures are also unspecified, raising potential concerns for stakeholders and the surrounding environment.
In Congressional District 00 of Montana, Dioscuri plays a crucial role in water resource management and climate resilience efforts within Chouteau County. As climate change intensifies, the importance of maintaining and upgrading infrastructure like Dioscuri becomes increasingly vital to address evolving water challenges and ensure the safety and sustainability of local communities. With its historical significance and ongoing operational relevance, Dioscuri stands as a noteworthy example of the intersection between water resources, climate adaptation, and regulatory oversight in the state of Montana.
Year Completed |
1955 |
Dam Length |
200 |
Dam Height |
15 |
River Or Stream |
GOOSE BILL COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
54 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Marias River Near Loma Mt
|
335cfs |
Teton River At Loma Mt
|
30cfs |
Missouri River At Fort Benton Mt
|
4720cfs |
Marias River Near Chester Mt
|
249cfs |
Missouri River At Virgelle Mt
|
4290cfs |
Missouri River Near Great Falls Mt
|
3530cfs |
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.
Dioscuri