Winlock Waterski Pond Dam Reservoir Report

Last Updated: December 13, 2025

The Winlock Waterski Pond Dam in Lewis County, Washington, is a privately owned earth dam completed in 1990 primarily for recreational purposes.


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Summary

Situated offstream from Tr-Coon Creek, the dam has a hydraulic height of 11 feet and a structural height of 11 feet, with a total length of 2000 feet. The dam has a normal storage capacity of 50 acre-feet, with a maximum storage of 80 acre-feet and a surface area of 13 acres.

Despite being classified as having low hazard potential, the Winlock Waterski Pond Dam is regulated and inspected by the Washington Department of Ecology. The dam is located in Congressional District 03 and is overseen by Representative Jaime Herrera Beutler. While it has not been rated for condition assessment, the dam lacks an emergency action plan and inundation maps, highlighting potential areas for improvement in risk management and emergency preparedness. Water resource and climate enthusiasts interested in recreational dams and their regulatory oversight will find the Winlock Waterski Pond Dam an intriguing case study.

Year Completed

1990

Dam Length

2000

River Or Stream

Tr-Coon Creek-Offstream

Primary Dam Type

Earth

Surface Area

13

Hydraulic Height

11

Drainage Area

2

Nid Storage

80

Structural Height

11

Hazard Potential

Low

Foundations

Soil

Nid Height

11
       
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.