Upsilon Reservoir Report

Last Updated: December 21, 2025

Upsilon, also known as Big Reservoir, is a private water resource located in Glacier, Montana.


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Summary

This earth dam was completed in 1930 and serves multiple purposes including fire protection, stock, and small fish pond. With a dam height of 20 feet and a storage capacity of 113 acre-feet, Upsilon plays a crucial role in managing water resources in the area.

Managed by the DNRC and regulated by the state of Montana, Upsilon has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. While the dam has not been modified in recent years, it is equipped with emergency action plans to ensure the safety of the surrounding community in case of any unforeseen events. With a location in Cut Bank and a drainage area for diffused surface water, Upsilon contributes to the overall water management efforts in the region.

Despite its modest size and capacity, Upsilon remains an important water resource for fire protection and agricultural needs in the area. As climate change continues to impact water availability and quality, the proper management and maintenance of dams like Upsilon are essential for ensuring a sustainable water supply for both current and future generations. Climate enthusiasts and water resource experts alike can appreciate the importance of facilities like Upsilon in enhancing water resilience and adaptation in the face of a changing climate.

Year Completed

1930

Dam Length

70

Dam Height

20

River Or Stream

DIFFUSED SURFACE WATER

Primary Dam Type

Earth

Hydraulic Height

20

Nid Storage

113

Hazard Potential

Low

Nid Height

20
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.