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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.

Weekend-long lane reductions planned through September

Paving on northbound I-5 in SeaTac, expansion joint replacement in Tukwila and guardrail work on SR 509 in Burien

SEATAC – Three more weekends of lane reductions on northbound Interstate 5 between Kent and Tukwila are scheduled this month, along with three weekends that will reduce both directions of State Route 509 to a single lane in Burien.

Contractor crews working for the Washington State Department of Transportation will be hard at work to #ReviveI5 and improve SR 509:

  • Aug. 11-14: Northbound I-5 paving and SR 509 guardrail replacement and paving.
  • Aug. 18-21 and 25-28: Replace expansion joints on northbound I-5.
  • Sept. 8-11 and 15-18: Both directions SR 509 guardrail replacement and paving.

Northbound I-5 in SeaTac, Tukwila

The weekend of Aug. 11-14, three lanes will close to pave the final layer of asphalt on northbound I-5 from SR 516 in SeaTac to South 170th Street in Tukwila. The weekends of Aug. 18-21 and 25-28, three lanes will close for expansion joint replacement at the Duwamish River Bridge in Tukwila.

  • Lane closures will begin at 8 p.m. each Friday. By 10 p.m., northbound I-5 will reduce to two lanes until 5 a.m. each Monday. All work is weather-dependent.
  • The final two weekends of lane reductions, to replace expansion joints at Interurban Avenue, have yet to be scheduled.

Guardrail and paving on SR 509

  • The left lane in both directions of SR 509 in Burien will close Aug. 11-14, Sept. 8-11 and 15-18 for guardrail repair and replacement and paving.
  • Lanes will close at 7 p.m. each Friday and reopen at 6 a.m. each Monday. The paving work is weather-dependent.

Plan ahead

Each day more than 100,000 vehicles travel northbound I-5 between Kent and Tukwila, and up to 30,000 use SR 509 in Burien. During the weekend-long lane reductions, drivers can help ease congestion by:

  • Using bus or light rail service.
  • Carpooling.
  • Scheduling trips early or late in the day.

Using alternative routes like I-405, or state routes 99 and 167.


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