Mauston Reservoir Report

Last Updated: December 5, 2025

Located in Juneau, Wisconsin, Mauston is a gravity dam standing at 14 feet tall and 292 feet long on the Lemonweir River.


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Summary

Completed in 1919, this dam primarily serves as a recreational site with a storage capacity of 2200 acre-feet and a surface area of 360 acres. The dam's spillway is controlled, with a width of 197 feet, and it has a low hazard potential with a satisfactory condition assessment.

Managed by the Wisconsin Department of Natural Resources (WIDNR), Mauston Dam is inspected every 10 years, with the last assessment completed in September 2019. The dam's risk assessment is deemed very high, but it meets guidelines for emergency action plans. While the dam has not been modified since 1994, it continues to play a crucial role in water resource management in the area. With its scenic location and recreational purpose, Mauston Dam stands as a vital piece of infrastructure in the region, attracting water resource and climate enthusiasts alike.

Years Modified

1994 - Other

Year Completed

1919

Dam Length

292

Dam Height

14

River Or Stream

LEMONWEIR

Primary Dam Type

Gravity

Surface Area

360

Hydraulic Height

9

Drainage Area

569

Nid Storage

2200

Structural Height

14

Hazard Potential

Low

Nid Height

14
       
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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.