Pollux Reservoir Report
Nearby: Diogenes Djokjakarta
Last Updated: December 5, 2025
Pollux is a privately owned earth dam located in Loma, Montana, along the Slide Out Coulee river or stream.
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Summary
Completed in 1960, the dam stands at 25 feet high and has a storage capacity of 47 acre-feet, with a primary purpose of providing fire protection, stock, or a small fish pond. Despite being regulated and inspected by the Montana Department of Natural Resources and Conservation (DNRC), Pollux has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment.
Situated in Chouteau County, Pollux serves as a vital resource for the local community, offering essential water storage for various purposes. The dam's location in Congressional District 00, Montana, falls under the jurisdiction of Representative Greg Gianforte. With its strategic design and construction, Pollux plays a key role in maintaining water resources in the region and contributes to the overall climate resilience of the area.
Although Pollux has not been assessed for its emergency action plan or risk management measures, its presence as a reliable water infrastructure asset underscores the importance of sustainable water management practices in the face of changing climate conditions. As water resource and climate enthusiasts, monitoring and supporting the upkeep of structures like Pollux is crucial for ensuring the long-term availability and quality of water resources in Montana and beyond.
Year Completed |
1960 |
Dam Length |
350 |
Dam Height |
25 |
River Or Stream |
SLIDE OUT COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
47 |
Hazard Potential |
Low |
Nid Height |
25 |
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 |
Missouri River At Virgelle Mt
|
4290cfs |
Marias River Near Chester Mt
|
249cfs |
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.
Pollux