Blomquist Reservoir Reservoir Report

Last Updated: December 8, 2025

Blomquist Reservoir in Twin Bridges, Montana, is a privately owned water storage facility primarily used for irrigation purposes.


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Summary

The reservoir was completed in 1950 and has a dam height of 12 feet, with a maximum storage capacity of 285 acre-feet and a normal storage level of 84 acre-feet. Located on Cave Gulch, the reservoir is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and falls under state jurisdiction for permitting, inspection, and enforcement.

With a low hazard potential and a current condition assessment of "Not Rated," Blomquist Reservoir serves as a vital water resource for agricultural needs in the Beaverhead County region. The reservoir spans a surface area of 1320 feet and operates under the Walla Walla District of the US Army Corps of Engineers. Despite not having a designated spillway type or spillway width, the reservoir remains a key component of the local water infrastructure, ensuring reliable water supply for irrigation activities in the area.

While lacking in certain detailed data points such as spillway information and risk assessment measures, Blomquist Reservoir continues to play a crucial role in supporting agricultural activities in the region. As a privately owned facility, the reservoir's maintenance and operations are overseen by the primary owner, with regulatory oversight from state agencies. Its strategic location and storage capacity make it a valuable asset for water management and climate adaptation efforts in the Beaverhead, Montana area.

Year Completed

1950

Dam Length

1320

Dam Height

12

River Or Stream

CAVE GULCH

Primary Dam Type

Earth

Hydraulic Height

12

Nid Storage

285

Hazard Potential

Low

Nid Height

12
       
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.
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Area Campgrounds