Cedar Hills Landfill Csw Pond Reservoir Report
Last Updated: December 15, 2025
Located in Issaquah, Washington, the Cedar Hills Landfill Csw Pond is a significant water resource managed by the local government and regulated by the Washington Department of Ecology.
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Summary
Completed in 2016, this Earth-type dam stands at a height of 14 feet and has a storage capacity of 53 acre-feet, with a normal storage level of 46 acre-feet. The dam, with a length of 320 feet, serves a primary purpose of "Other" and is inspected every 5 years, with the last assessment in September 2020 rating its condition as fair.
With a hazard potential classified as significant, the Cedar Hills Landfill Csw Pond is a vital structure in managing water resources in the region. The dam has a maximum discharge of 214 cubic feet per second and covers a drainage area of 0.09 square miles. The surrounding area is at risk of inundation, and emergency action plans are in place to address any potential risks. Despite its fair condition, ongoing risk assessments and management measures are crucial to ensure the safety and integrity of the dam for the community and the environment it serves.
Year Completed |
2016 |
Dam Length |
320 |
Primary Dam Type |
Earth |
Hydraulic Height |
14 |
Drainage Area |
0.09 |
Nid Storage |
53 |
Structural Height |
14 |
Hazard Potential |
Significant |
Nid Height |
14 |
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.
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