Millhome Reservoir Report

Last Updated: December 5, 2025

Millhome is a gravity dam situated on the Sheboygan River in Manitowoc, Wisconsin.


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Summary

Built in 1930, this structure serves primarily for recreational purposes, offering a serene environment for water enthusiasts to enjoy various activities. With a height of 11 feet and a storage capacity of 250 acre-feet, Millhome provides a tranquil setting covering 51 acres with a drainage area of 168 square miles.

Despite its age, Millhome has been well-maintained, with a fair condition assessment as of May 2020 and a low hazard potential. The dam's spillway is controlled, and it has a maximum discharge capacity of 3,595 cubic feet per second. The risk assessment for the dam is very high (1), indicating a need for vigilant monitoring and management measures to ensure the safety and integrity of the structure.

Managed by the local government and regulated by the Wisconsin Department of Natural Resources, Millhome stands as a testament to the importance of water resource management in the face of climate change. Its location in a high-risk area underscores the need for continuous assessment and preparedness to mitigate potential hazards and safeguard the surrounding community and environment.

Year Completed

1930

Dam Length

104

Dam Height

11

River Or Stream

SHEBOYGAN

Primary Dam Type

Gravity

Surface Area

51

Hydraulic Height

8

Drainage Area

168

Nid Storage

250

Structural Height

11

Hazard Potential

Low

Nid Height

11
       
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.