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I-5 / SR 509

Freight and Congestion Relief Project

The proposed extension of SR 509 from its current terminus at South 188th Street to a new connection to I-5 at South 210th Street, and the widening of I-5 from South 210th Street to South 320th Street in Federal Way, provides several benefits. The project will ease congestion on I-5, provide an alternative route for trucks in lieu of
I-5, SR 99 and local streets, and improve southern access to Seattle-Tacoma International Airport.

The I-5/SR 509 project is ready to go to construction. The preliminary design has been completed. State and federal permits and environmental documents are complete. WSDOT is purchasing a portion of the land needed to build the roads, and has nearly completed some environmental improvements that are part of the project.

The Washington state legislature and project partners have provided some funding, but more is needed before major construction can begin. The project partners are: the Federal Highway Administration, WSDOT, the Port, cities of SeaTac, Des Moines and Kent.

Learn more at the Washington State Department of Transportation website here.