14 May 2020
The SR 509 Completion Project extends SR 509 to I-5 near Tukwila, adds a southern access point to Sea-Tac International Airport, and improves service between industrial districts by allowing general purpose traffic and trucks to bypass I-5, SR 99 and local streets.
When finished, SR 509 will be a key component of the Seattle and south King County transportation network. Along with the SR 99 tunnel improvements, the project provides a critical north-south alternative to I-5 through Seattle and King County.
Check out our video about the SR 509 Completion Project to learn about the project’s benefits and get a glimpse of what it will look like when it’s completed.
PRESENTER: Susan Everett
SR 509 Project Manager