Wissota Reservoir Report

Last Updated: December 6, 2025

Wissota is a captivating hydroelectric dam located on the Chippewa River in Chippewa Falls, Wisconsin.


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Summary

Completed in 1917, this gravity dam stands at 68 feet tall and spans 7800 feet in length, with a maximum storage capacity of 56,000 acre-feet. The dam serves multiple purposes, including flood risk reduction, hydroelectric power generation, and recreation, making it a vital asset for the region.

Managed by the Federal Energy Regulatory Commission, Wissota has a controlled spillway with a width of 904 feet and other controlled outlet gates. With a high hazard potential and very high risk assessment, the dam is closely monitored and regulated by both federal and state agencies. The surrounding area offers a surface area of 6212 acres and a drainage area of 5528 square miles, providing ample water resources and recreational opportunities for visitors.

Despite its age, Wissota remains a key player in water resource management and climate resilience efforts in the region. With its historical significance, engineering marvel, and essential role in providing renewable energy and flood protection, Wissota stands as a testament to the intersection of human ingenuity and environmental stewardship in the face of changing climate conditions.

Year Completed

1917

Dam Length

7800

Dam Height

68

River Or Stream

Chippewa River

Primary Dam Type

Gravity

Surface Area

6212

Drainage Area

5528

Nid Storage

56000

Outlet Gates

Other Controlled - 13

Hazard Potential

High

Foundations

Rock

Nid Height

68
       
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.