Dead Horse Slough Reservoir Report

Nearby: Day Day Lake

Last Updated: December 5, 2025

Located in Ashland, Wisconsin, Dead Horse Slough is a state-regulated water resource with a high hazard potential and fair condition assessment.


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Summary

This structure, completed with a dam height of 19 feet and a hydraulic height of 7 feet, serves to control water flow and store up to 900 acre-feet of water. With a drainage area of 5.9 square miles and a spillway type classified as 'Uncontrolled', Dead Horse Slough plays a crucial role in managing water levels in the region.

Despite its moderate risk assessment and frequent inspections every two years, Dead Horse Slough continues to be a key asset in the state's water management efforts. Its location at coordinates 46.1551387 latitude and -90.8577021 longitude makes it a vital component of the water infrastructure in the area. While it lacks associated structures and detailed information on its construction and maintenance history, the presence of state regulation, permitting, inspection, and enforcement ensures that Dead Horse Slough remains a reliable and essential resource for water resource and climate enthusiasts in the region.

With a capacity to store 900 acre-feet of water and a surface area of 100 acres, Dead Horse Slough not only provides flood control but also supports various ecological functions. As water resource and climate enthusiasts monitor its condition and regulatory compliance, the dam continues to play a significant role in ensuring water security and management in Ashland, Wisconsin. As efforts to enhance its risk management measures and emergency preparedness continue, Dead Horse Slough remains a critical structure in the state's water infrastructure landscape.

Dam Length

360

Dam Height

19

Surface Area

100

Hydraulic Height

7

Drainage Area

5.9

Nid Storage

900

Structural Height

19

Hazard Potential

High

Nid Height

19
       
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.