Clarks Mill Reservoir Report

Last Updated: December 5, 2025

Clarks Mill, located in Manitowoc, Wisconsin, is a gravity dam completed in 1860 for the primary purpose of recreation along the Manitowoc River.


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Summary

This historic structure stands at 13 feet high and spans 140 feet in length, with a storage capacity of 200 acre-feet and a surface area of 43 acres. Despite its age, Clarks Mill is in fair condition and poses a low hazard potential, making it a popular destination for water resource and climate enthusiasts seeking outdoor activities in the area.

Managed by the local government and regulated by the Wisconsin Department of Natural Resources, Clarks Mill offers a picturesque setting for recreational opportunities such as fishing, boating, and wildlife observation. The dam's uncontrolled spillway and moderate risk assessment add to its charm, attracting visitors who appreciate the beauty of the surrounding landscape and the historical significance of the structure. With regular inspections and enforcement measures in place, Clarks Mill provides a safe and enjoyable environment for both residents and tourists to explore and appreciate the intersection of water resources and climate in Wisconsin.

Overall, Clarks Mill serves as a vital part of the water infrastructure in Manitowoc County, offering a balance between conservation and recreation for the community. Its long history, coupled with its scenic location along the Manitowoc River, makes it a valuable asset for water resource and climate enthusiasts interested in sustainable management practices and the preservation of natural ecosystems. Whether for leisure or educational purposes, Clarks Mill remains a significant landmark that showcases the importance of responsible stewardship of our water resources in the face of changing climate conditions.

Years Modified

1932 - Other

Year Completed

1860

Dam Length

140

Dam Height

13

River Or Stream

MANITOWOC

Primary Dam Type

Gravity

Surface Area

43

Hydraulic Height

8

Drainage Area

411

Nid Storage

200

Structural Height

13

Hazard Potential

Low

Nid Height

13
       
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.