Menasha Lock And Dam Reservoir Report

Last Updated: December 6, 2025

Menasha Lock and Dam, located in Menasha, Wisconsin, is a vital structure managed by the US Army Corps of Engineers for flood risk reduction, fish and wildlife conservation, navigation, recreation, and water supply purposes.


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Summary

Completed in 1937, the concrete dam stands at a height of 16 feet with a hydraulic height of 9 feet and a length of 401 feet. It has a controlled spillway with a width of 367 feet and one lock measuring 144 feet in length and 35 feet in width.

A recent risk assessment conducted by USACE identified potential hazards such as overtopping of the island between the dam and navigation channel, as well as seepage through the abutments. To mitigate risks, regular inspections, maintenance, and emergency action plans are in place. The dam's partners work closely to monitor conditions, with USACE staff making frequent visits to adjust gates and ensure structural integrity. Additionally, proactive measures such as tree removal and equipment upgrades have enhanced the dam's reliability and long-term resilience.

For water resource and climate enthusiasts interested in the management of infrastructure like Menasha Lock and Dam, the collaboration between multiple agencies and the proactive approach to addressing potential risks serve as an example of effective risk management and maintenance practices in ensuring the safety and functionality of critical water resources.

Year Completed

1937

Dam Length

401

River Or Stream

FOX

Primary Dam Type

Concrete

Surface Area

173000

Length Of Locks

144

Hydraulic Height

9

Drainage Area

6030

Nid Storage

2430000

Structural Height

16

Hazard Potential

High

Foundations

Soil

Nid Height

16
       
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.