Rapide Croche Lock And Dam Reservoir Report

Last Updated: December 6, 2025

Rapide Croche Lock and Dam, situated on the Fox River in Wrightstown, Wisconsin, was completed in 1930 with a primary purpose of flood risk reduction.


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Summary

The dam, owned and operated by the US Army Corps of Engineers, serves multiple functions including hydroelectric power generation, navigation, and water supply. The concrete structure spans 600 feet in length and features a controlled spillway and a lock with dimensions of 146 feet in length and 36 feet in width.

A recent risk assessment conducted by the USACE identified seepage and potential impacts from ice or debris as primary risk factors for the dam. To manage these risks, regular monitoring and inspections are conducted by USACE staff, in collaboration with the State and hydropower company. Emergency Action Plans are in place, and daily updates on discharges from Lake Winnebago are provided to the public. Proactive measures, such as replacing spillway piers and gates, have been implemented to enhance the reliability and resilience of the structure.

Overall, Rapide Croche Lock and Dam is a critical infrastructure contributing to water resource management in the region. The collaborative efforts of various agencies and stakeholders ensure the continuous operation and safety of the dam, exemplifying a proactive approach to risk management and maintenance in the face of climate challenges.

Year Completed

1930

Dam Length

600

River Or Stream

FOX

Primary Dam Type

Concrete

Surface Area

373

Length Of Locks

146

Hydraulic Height

10

Drainage Area

6150

Nid Storage

5100

Structural Height

20

Hazard Potential

Significant

Foundations

Rock

Nid Height

20
       
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.