Wilmington Twp 3 Reservoir Report

Last Updated: December 5, 2025

Wilmington Twp 3, also known as Rosie Stoltz 402, is a private dam located in Houston, Minnesota, along the Winnebago Creek.


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Summary

Constructed in 2011 by G-CUBED, this earth dam stands at a height of 18 feet and serves the primary purpose of flood risk reduction in the area. The dam has a storage capacity of 103 acre-feet and covers a drainage area of 1.3 square miles, providing essential protection to the surrounding region.

Managed by the Minnesota Department of Natural Resources, Wilmington Twp 3 has been deemed to have a low hazard potential with a satisfactory condition assessment as of the last inspection in May 2012. While the dam does not have spillways or locks, it fulfills its role effectively in mitigating flood risks and ensuring the safety of nearby residents. With state-regulated permitting, inspection, and enforcement in place, the dam remains a crucial asset for water resource management in the region.

Overall, Wilmington Twp 3 stands as a vital infrastructure asset in the flood-prone area of Camp Winnebago, offering protection, peace of mind, and effective flood risk reduction measures for the local community. Its strategic location, design, and regulatory oversight make it a noteworthy structure for water resource and climate enthusiasts interested in sustainable water management practices in Minnesota.

Year Completed

2011

Dam Height

18

River Or Stream

WINNEBAGO CREEK

Primary Dam Type

Earth

Drainage Area

1.3

Nid Storage

103

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

18
       
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.