Slabtown Reservoir Report

Nearby: Rome Cushman

Last Updated: December 5, 2025

Slabtown, located in Hebron, Wisconsin, is a privately owned dam that was completed in 1948 with a primary purpose of recreation.


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Summary

This earth and gravity dam stands at a height of 10 feet and has a hydraulic height of 7 feet, providing a maximum storage capacity of 100 acre-feet. The dam spans a length of 60 feet and covers a surface area of 32 acres, serving as a popular recreational spot for visitors to enjoy water-based activities on the Bark River.

Despite its low hazard potential, Slabtown poses a very high risk, with a risk assessment rating of 1. The dam is regulated by the Wisconsin Department of Natural Resources (WIDNR) and undergoes regular inspections every 10 years to ensure its structural integrity and safety. With a drainage area of 115 square miles and a maximum discharge capacity of 1452 cubic feet per second, Slabtown plays a crucial role in managing water resources in Jefferson County, Wisconsin. While the dam's condition assessment is currently not rated, its importance in water management and recreation highlights the need for continued monitoring and risk management measures to ensure the safety of the surrounding community and ecosystem.

Year Completed

1948

Dam Length

60

Dam Height

10

River Or Stream

BARK

Surface Area

32

Hydraulic Height

7

Drainage Area

115

Nid Storage

100

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.