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Road Construction

​The news you need to navigate during road construction projects to improve traffic flow in and out of Sea-Tac Airport. 

Do you Take the “Secret” Backroad to Sea-Tac Airport?

Beginning April 6, State Route 509 is getting a much-needed makeover:

  • Monday, April 6 to the morning of Friday, April 10 - The right lane of southbound SR 509 from South 112th Street to South 160th Street will be closed from 8 p.m. to 5 a.m. nightly for pavement repairs.
  • Monday, April 6 to the morning of Tuesday, April 7 - The southbound SR 509 off-ramp to South 112th Street will be closed from 9 p.m. to midnight for pavement repairs.
  • Tuesday, April 7 - The southbound SR 509 ramps to and from South 128th Street will be closed from midnight to 5 a.m. for pavement repairs. Tuesday, April 7 to the morning of Thursday, April 9 - The southbound SR 509 off-ramp to South 146th Street and ramps to and from South 148th Street will be closed from 9 p.m. to 5 a.m. nightly for pavement repairs.

For regular updates, visit WADOT King County Construction page.

Link Light Rail Extension

The South 200th Extension extends light rail from the current light rail station at Sea-Tac Airport to South 200th Street in the City of SeaTac. The 1.6-mile elevated guideway and station will open in late 2016, at the same time as University Link and four years earlier than envisioned in the voter-approved Sound Transit 2 plan.
Read the project details.

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