Suukjak Sep Reservoir Report

Last Updated: December 12, 2025

Suukjak Sep is a federal-owned dam located in Fort Mc Coy, Wisconsin, along the Squaw Creek.


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Summary

Built in 1961 by Ayers & Assoc., this earth dam stands at a height of 24 feet and spans 400 feet in length. The dam serves a primary purpose of recreation, offering a storage capacity of 315 acre-feet and a surface area of 14 acres for outdoor activities. With a significant hazard potential and a moderate risk assessment rating, Suukjak Sep is closely monitored by the US Army, who also oversees its funding, design, construction, regulation, inspection, and operation.

Despite not being regulated by the state, Suukjak Sep is a key feature in the St. Paul District managed by the US Army. The dam's spillway type is uncontrolled, with a width of 74 feet, capable of handling a maximum discharge of 2000 cubic feet per second. While the condition assessment is currently unavailable, the dam is inspected every 4 years to ensure its safety and functionality. With its location in Monroe County and its close proximity to the city of Fort Mc Coy, Suukjak Sep offers a recreational oasis for water resource and climate enthusiasts to enjoy nature and outdoor activities amidst the scenic surroundings of Squaw Creek.

Year Completed

1961

Dam Length

400

Dam Height

24

River Or Stream

Squaw Creek

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

24

Drainage Area

12

Nid Storage

315

Hazard Potential

Significant

Foundations

Soil

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.