TagDes Moines Creek Basin Plan(28)

The Port of Seattle is seeking authorization to enter into a fifth Interlocal Agreement (ILA V) with the Cities of Des Moines and SeaTac to continue restoration projects along Des Moines Creek, contributing $89,304 per year over a 20-year period. This agreement is the latest in a series dating back to 1995, through which the Port, neighboring cities, King County, and the Washington Department of Transportation have collaborated on stormwater management and environmental restoration in the creek basin near Sea-Tac Airport. The ongoing work addresses the airport's environmental impact on local waterways and reflects a long-term regional commitment to creek basin planning and habitat restoration.

The Port of Seattle is seeking authorization to enter into a 20-year Interlocal Agreement with the Cities of Des Moines and SeaTac to continue the Des Moines Creek Basin Plan, which manages drainage, flooding, erosion, fish habitat, and water quality issues near Seattle-Tacoma International Airport. The Port would contribute $89,304 per year, covering ongoing operation and maintenance, habitat monitoring, and infrastructure improvements for facilities such as the Regional Detention Facility and High Flow Bypass Pipeline. This cooperative regional effort reduces costs for all parties and supports the airport's stormwater management and environmental compliance obligations.

The Des Moines Creek Basin Restoration Projects Interlocal Agreement (GCA-3921) is a cooperative agreement between the City of Des Moines, City of SeaTac, Port of Seattle, Washington State Department of Transportation, and King County to fund and manage several creek restoration projects. The projects aim to control stream flows, improve water quality and fish habitat, and address drainage and flooding problems in the Des Moines Creek Basin. The agreement also serves as part of the stormwater management strategy for the SR 509 highway extension, with costs and responsibilities shared among the participating agencies.

This interlocal agreement establishes a cooperative framework between King County, the City of Des Moines, the City of SeaTac, WSDOT, and the Port of Seattle to implement the Des Moines Creek Basin Plan. The parties agreed to jointly fund and manage the preparation of a Final Design Report, Financing Plan, and environmental permits for capital projects addressing stormwater runoff, flooding, fish habitat, and water quality in the Des Moines Creek Basin. WSDOT's participation was motivated in part by the need to reduce the impacts of surface water runoff from State Routes 509 and 99 and Interstate 5 on the surrounding natural resource system.

This presentation by King County Department of Natural Resources & Parks outlines a holistic approach to restoring Des Moines Creek and its surrounding watershed, located in King County, Washington. It covers basin planning, environmental modeling, regulatory considerations, and project costs and scheduling. The project aims to address watershed health through comprehensive assessment and coordinated restoration strategies.