January 26, 2021 — Washington State Department of Transportation (WSDOT) has opened a virtual open house for residents of SeaTac and surrounding communities to explore the new project on SR 509. WSDOT is starting construction on the SR 509, I-5 to 24th Avenue S. – Expressway Project in 2022. This project is part of WSDOT’s effort to extend the SR 509 highway from where it currently ends by Sea-Tac International Airport to Interstate 5.
This online open house will include items like the construction timeline, information about what’s included in the project, construction impacts, and more. It will be open from now until March 5, 2021.