Coon Creek 15 Reservoir Report

Last Updated: December 5, 2025

Coon Creek 15, also known as Swenson, is a flood risk reduction structure located in Vernon, Wisconsin.


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Summary

Owned by the local government and regulated by the Wisconsin Department of Natural Resources, this earth dam was completed in 1962 and stands at a height of 44 feet. Its primary purpose is to control debris and reduce the risk of flooding along the TR Timber Coulee.

With a storage capacity of 120 acre-feet and a drainage area of 1 square mile, Coon Creek 15 plays a crucial role in managing water flow and protecting the surrounding area from potential hazards. Despite its relatively low hazard potential and satisfactory condition assessment, the dam is subject to regular inspections every 10 years to ensure its continued effectiveness. With a moderate risk assessment rating of 3, risk management measures are in place to address any potential issues that may arise.

In the event of an emergency, the dam's emergency action plan is up to date, and emergency contacts are readily available. Coon Creek 15 serves as a testament to the importance of proper water resource management and climate resilience efforts in safeguarding communities against natural disasters and maintaining the integrity of our water infrastructure.

Year Completed

1962

Dam Length

260

Dam Height

44

River Or Stream

TR TIMBER COULEE

Primary Dam Type

Earth

Surface Area

2

Hydraulic Height

20

Drainage Area

1

Nid Storage

120

Structural Height

44

Hazard Potential

Low

Nid Height

44
       
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.