Upper Brunet Reservoir Report

Last Updated: December 5, 2025

Upper Brunet, also known as Brunet River, is a gravity dam located in Sawyer, Wisconsin, with a primary purpose of recreation.


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Summary

Built in 1939, this structure stands at a height of 17 feet and has a storage capacity of 1400 acre-feet, providing essential water resources for the area. With a drainage area of 30 square miles and a maximum discharge of 5500 cubic feet per second, Upper Brunet plays a crucial role in managing water flow and ensuring the safety of surrounding communities.

Despite its fair condition assessment and high hazard potential, Upper Brunet remains a popular destination for water and climate enthusiasts, offering a surface area of 137 acres for recreational activities. The dam's controlled spillway and regular inspections by the Wisconsin Department of Natural Resources contribute to its overall safety and functionality. However, the risk assessment for Upper Brunet indicates a very high risk level, emphasizing the importance of continued monitoring and maintenance to mitigate potential hazards and ensure the dam's long-term sustainability.

With its picturesque location and vital role in water resource management, Upper Brunet serves as a significant landmark in the Detroit District. As one of the key structures regulated by the WIDNR, this dam stands as a testament to the intersection of human infrastructure and natural ecosystems. Whether exploring the Brunet River for recreational purposes or studying the impact of climate change on water resources, Upper Brunet offers a compelling case study for those passionate about environmental conservation and sustainable development.

Years Modified

1951 - Other

Year Completed

1939

Dam Length

300

Dam Height

17

River Or Stream

BRUNET

Primary Dam Type

Gravity

Surface Area

137

Hydraulic Height

12

Drainage Area

30

Nid Storage

1400

Structural Height

17

Hazard Potential

High

Nid Height

17
       
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.