Sotak Flowage Reservoir Report

Last Updated: December 6, 2025

Sotak Flowage, also known as Pershing Wildlife Area #3, is a state-owned water resource in Taylor County, Wisconsin.


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Summary

This flowage is regulated by the Wisconsin Department of Natural Resources (WIDNR) and is situated on the TR Fisher River. Completed in 1965, the Earth dam stands at 9.3 feet high and has a hydraulic height of 7 feet, with a total length of 1180 feet. The flowage has a normal storage capacity of 200 acre-feet and a maximum storage of 320 acre-feet, covering an area of 85 acres.

With a low hazard potential and fair condition assessment, Sotak Flowage is a vital resource for water enthusiasts and climate activists in the region. The dam's controlled spillway, with a width of 42 feet, helps manage a maximum discharge of 50 cubic feet per second. Despite its very high risk assessment rating, the flowage's emergency action plan and risk management measures are currently under review. The flowage serves as a picturesque location for outdoor activities and wildlife observation, making it a valuable asset for both recreational and environmental purposes in the area.

Year Completed

1965

Dam Length

1180

Dam Height

9.3

River Or Stream

TR FISHER RIVER

Primary Dam Type

Earth

Surface Area

85

Hydraulic Height

7

Drainage Area

0.2

Nid Storage

320

Structural Height

9.3

Hazard Potential

Low

Nid Height

9
       
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.