Park Mill Reservoir Report

Last Updated: December 5, 2025

Park Mill, located on the Menominee River at the border of Menominee, Michigan, and Marinette, Wisconsin, is a concrete gravity dam completed in 1920 primarily for hydroelectric purposes.


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Summary

With a height of 24 feet and a length of 538 feet, this dam has a storage capacity of 3,788 acre-feet and serves a drainage area of 4,060 square miles. The dam features a Tainter spillway with a width of 303 feet and is equipped with 12 radial outlet gates.

Managed by the Federal Energy Regulatory Commission, Park Mill has a low hazard potential and a moderate risk assessment rating. While the condition assessment is listed as "Not Available," the dam undergoes inspections every 3 years to ensure its structural integrity and operational efficiency. Emergency action plans have been prepared and updated periodically, demonstrating a commitment to the safety and proper management of this essential water resource infrastructure in the region.

Year Completed

1920

Dam Length

538

Dam Height

24

River Or Stream

Menominee River

Primary Dam Type

Concrete

Surface Area

539

Drainage Area

4060

Nid Storage

3788

Outlet Gates

Tainter (radial) - 12

Hazard Potential

Low

Foundations

Rock

Nid Height

24
       
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.