Headquarters Landfill Leachate Pond Reservoir Report
Last Updated: December 15, 2025
The Headquarters Landfill Leachate Pond in Cowlitz, Washington, is a significant water resource managed by the local government with oversight from the Washington Department of Ecology.
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Summary
This Earth-type dam was completed in 1993 and serves as a containment pond for leachate generated by the landfill. With a hydraulic height of 15.6 feet and a structural height of 19 feet, the pond has a normal storage capacity of 21.83 acre-feet and a maximum discharge rate of 1.5 cubic feet per second.
Located in Sucker Creek to Silver Lake watershed, the Headquarters Landfill Leachate Pond covers a surface area of 2300 square feet and has a drainage area of 0.03 square miles. The dam's condition has been assessed as satisfactory, with a significant hazard potential. Regular inspections are conducted every 5 years to ensure its integrity and safety. Despite its purpose as a containment pond, the dam also serves other functions, making it a valuable asset for water resource management in the region.
In the event of an emergency, the pond's emergency action plan is periodically reviewed and updated to meet guidelines. The risk management measures for the dam are continuously evaluated to mitigate any potential risks associated with its operation. With its strategic location and vital role in managing leachate from the landfill, the Headquarters Landfill Leachate Pond stands as a crucial infrastructure for water resource and climate enthusiasts to monitor and support in Cowlitz, Washington.
Year Completed |
1993 |
Dam Length |
743 |
River Or Stream |
Sucker Creek to Silver Lake |
Primary Dam Type |
Earth |
Surface Area |
2300 |
Hydraulic Height |
15.6 |
Drainage Area |
0.03 |
Nid Storage |
26 |
Structural Height |
19 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Seaquest State Park
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Yurt Village
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Seaquest State Park Campground
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Kid Valley Campground
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Headquarters Landfill Leachate Pond