Project description

The Seola Pond Regional Detention facility will be converted into a combination detention pond/wetpool. The facility will be enlarged and retrofitted with a permanent wetpool for water quality treatment. This will reduce the amount of pollutant transport to Seola Creek and ultimately, Puget Sound. The hydraulics of the Seola facility will be improved to foster healthy wetland plantings and consequently improve water quality. This project will also retrofit a roadside ditch upstream of the pond to employ bio-filtration to remove pollutants.

Flood protection will be increased by excavating additional live stormwater storage within the facility and installing an additional emergency pond overflow pipe.

Seola Retention/Detention facility

Seola Creek Retrofit Plan and Aerial

Project timeline

Lead agency

This project is being designed and managed by the King County Department of Natural Resources and Parks, Water and Land Resources Division, Capital Services Unit. Our primary goal is to implement Surface Water Management Capital Improvement Program (CIP) projects by planning, designing, constructing and managing multidisciplinary teams and stakeholders.

What is next?

We are committed to working closely with project area neighbors. Please contact Wendy Kara, the project manager, for more information about this project. 

Drainage problem?

For drainage problems in unincorporated King County, report drainage problems online or call 206-477-4811. For drainage problems within the City of Seattle, report problems on the Seattle Public Utilities home page or call 206-386-1800.