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SR 509/24th Avenue South to South 188th Street New Expressway

Welcome

WSDOT is starting construction on the SR 509/24th Avenue South to South 188th Street New Expressway project in 2024. This project is the final, fully-funded stage (Stage 2) of the SR 509 Completion Project.

How to participate

This online open house provides information about the areas where project construction work will occur and the schedules for completing the project’s most visible activities. Please visit the following pages to learn more about the project and then share your questions on the Keep in Touch page.

You may access the online open house through Oct. 25, 2024.