Lemonweir Reservoir Report

Last Updated: December 5, 2025

Lemonweir, located in Juneau, Wisconsin, is a gravity dam completed in 1926 primarily used for recreation purposes.


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Summary

With a structural height of 14 feet and a length of 700 feet, Lemonweir provides a storage capacity of 80 acre-feet and has a maximum discharge of 3410 cubic feet per second. The dam sits along the Lemonweir River and is regulated by the Wisconsin Department of Natural Resources, ensuring that it meets state permitting, inspection, and enforcement requirements.

Despite its age, Lemonweir has a high hazard potential due to its condition assessment being marked as "Not Rated." The risk assessment for the dam is classified as "Very High (1)," emphasizing the importance of regular inspections and maintenance to prevent any potential disasters. The last inspection date for Lemonweir was in April 1992, with a scheduled inspection frequency of every 2 years. It is essential for water resource and climate enthusiasts to monitor and advocate for the proper management and maintenance of Lemonweir to ensure the safety of both the dam and the surrounding community.

Year Completed

1926

Dam Length

700

Dam Height

14

River Or Stream

LEMONWEIR

Primary Dam Type

Gravity

Surface Area

11

Hydraulic Height

7

Drainage Area

594

Nid Storage

80

Structural Height

14

Hazard Potential

High

Nid Height

14
       
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.