Middle Mckinnsy Reservoir Report

Last Updated: December 6, 2025

Middle Mckinnsy, also known as Mckinnsey Slough Impound.


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Summary

2, is a federal-owned dam located in Price County, Wisconsin. Completed in 1988, this earth dam stands at a height of 8 feet and has a hydraulic height of 6 feet. It serves the primary purpose of controlling water flow along the MCKINNSEY CREEK, with a maximum storage capacity of 70 acre-feet and a surface area of 35 acres.

Despite its low hazard potential and fair condition assessment, Middle Mckinnsy poses a very high risk due to its location and potential impact on the surrounding area. The dam has a controlled spillway type with a width of 19 feet, and a maximum discharge capacity of 60 cubic feet per second. While the dam has not been modified in recent years and does not have an Emergency Action Plan (EAP) in place, it is subject to state permitting and enforcement regulations.

With its unique characteristics and risk profile, Middle Mckinnsy is a noteworthy structure for water resource and climate enthusiasts to study and monitor. Its location in the Detroit District of the US Army Corps of Engineers, along with its historical significance in water management in the region, make it a valuable asset to the overall water infrastructure in Wisconsin.

Year Completed

1988

Dam Length

400

Dam Height

8

River Or Stream

MCKINNSEY CREEK

Primary Dam Type

Earth

Surface Area

35

Hydraulic Height

6

Drainage Area

0.45

Nid Storage

70

Structural Height

8

Hazard Potential

Low

Nid Height

8
       
Seasonal Comparison

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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.