Lower Balsam Lake Reservoir Report

Last Updated: December 5, 2025

Lower Balsam Lake in Polk, Wisconsin, is a captivating location for water resource and climate enthusiasts.


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Summary

This hydroelectric dam, completed in 1860, stands at a height of 38 feet and has a normal storage capacity of 12,000 acre-feet, providing essential resources for the surrounding area. With a drainage area of 24.3 square miles and a surface area of 2054 acres, the dam plays a crucial role in managing water flow and supporting recreational activities.

Owned and regulated by the Wisconsin Department of Natural Resources (WIDNR), Lower Balsam Lake is a gravity dam on the Balsam Branch river. The dam's significant hazard potential is closely monitored, with a fair condition assessment as of May 2020. Despite its age, the structure continues to provide reliable hydroelectric power and recreational opportunities, attracting visitors to its picturesque location in the Detroit District.

For those interested in the history and engineering of water infrastructure, Lower Balsam Lake offers a fascinating glimpse into the past. With a very high risk assessment rating and regular inspections, the dam is a testament to the importance of sustainable water management in the face of changing climate conditions. As a key player in the local ecosystem, Lower Balsam Lake serves as a vital resource for the community and a reminder of the delicate balance between human development and environmental conservation.

Years Modified

1916 - Other

Year Completed

1860

Dam Length

220

Dam Height

38

River Or Stream

BALSAM BRANCH

Primary Dam Type

Gravity

Surface Area

2054

Hydraulic Height

33

Drainage Area

24.3

Nid Storage

22300

Structural Height

38

Hazard Potential

Significant

Nid Height

38
       
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.