Lake Sherburne Reservoir Report

Last Updated: December 25, 2025

Lake Sherburne, located in Glacier County, Montana, is a picturesque reservoir primarily used for irrigation purposes.


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Summary

Managed by the Bureau of Reclamation, this earth dam stands at a towering height of 109 feet and was completed in 1920. With a maximum storage capacity of 110,679 acre-feet and a normal storage of 67,854 acre-feet, Lake Sherburne covers an expansive surface area of 2,163 acres.

Despite its tranquil appearance, Lake Sherburne poses a high hazard potential, with a moderate risk assessment rating. The spillway, with a width of 96 feet, is uncontrolled, adding to the potential risks associated with the dam. Although last inspected in August 2020, the condition assessment of the dam is not available, raising concerns about its safety and maintenance protocols. While the dam has undergone modifications in 1982 for both hydraulic and structural improvements, the risk management measures for Lake Sherburne are not explicitly outlined in the data.

Enthusiasts of water resources and climate in the region will find Lake Sherburne a fascinating subject of study, given its historical significance in irrigation and the potential risks it poses as a high hazard dam. As a vital water source in the area, understanding the management and safety protocols of Lake Sherburne is crucial for ensuring the sustainability of water resources and the protection of surrounding communities. Further research and monitoring of this dam are essential to mitigate any potential risks and safeguard the ecosystem it supports in Glacier County, Montana.

Years Modified

1982 - Hydraulic, 1982 - Structural

Year Completed

1920

Dam Length

1200

Dam Height

109

River Or Stream

SWIFTCURRENT CREEK

Primary Dam Type

Earth

Surface Area

2163

Hydraulic Height

94

Nid Storage

110679

Structural Height

109

Hazard Potential

High

Foundations

Rock

Nid Height

109
       
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.