Lake Kegonsa Reservoir Report

Last Updated: December 6, 2025

Lake Kegonsa, located in Dane County, Wisconsin, is a captivating body of water with a rich history dating back to its completion in 1938.


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Summary

This man-made lake serves as a vital resource for navigation and recreation, offering visitors a serene escape in the heart of nature. With a dam height of 10 feet and a storage capacity of 16,300 acre-feet, Lake Kegonsa provides a beautiful setting for water enthusiasts and climate advocates alike.

The lake's primary purpose is navigation, and its controlled spillway system ensures efficient water management during periods of high discharge. Despite its low hazard potential and fair condition assessment, Lake Kegonsa faces a very high risk due to its critical importance as a water source in the region. The lake's emergency action plan and risk management measures are crucial in ensuring the safety and sustainability of this picturesque water body for future generations.

Surrounded by the stunning landscapes of southern Wisconsin, Lake Kegonsa offers a unique blend of natural beauty and human ingenuity. Whether you're a boating enthusiast, a wildlife lover, or a climate advocate, this lake provides a perfect opportunity to immerse yourself in the wonders of water resource management and conservation. With its rich history, diverse recreational opportunities, and vital role in the local ecosystem, Lake Kegonsa is a true gem waiting to be explored and cherished.

Years Modified

2011 - Other

Year Completed

1938

Dam Length

100

Dam Height

10

River Or Stream

YAHARA

Primary Dam Type

Gravity

Surface Area

2716

Length Of Locks

62

Hydraulic Height

1

Drainage Area

410

Nid Storage

16300

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.