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What’s next?

Construction is ramping up

Our contractor will begin construction on the Barnes Creek mitigation site in summer 2024, followed by work at the South 160th Street/SR 509 interchange and southbound I-5, between SR 516 and South 272nd Street. In 2025, crews will begin building the new SR 509 Expressway between 24th Avenue South and the South 188th Street interchange.

You may see our crews drilling, clearing vegetation, surveying, and working on utilities at any location throughout the project corridor before the end of 2024. The best way to stay up to date on construction activities is to follow WSDOT’s social media platforms and subscribe to our quarterly English-language newsletters, available in other languages on request. If you have any questions at any time, you can always reach out to our team at 206-225-0674 or