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SR 18 closures coming as I-90 interchange project nears completion

WSDOT said crews will begin final paving and striping work, with at least three weekend closures and one lane reopening Monday mornings.

  • The Washington State Department of Transportation plans final closures at State Route 18 and I-90 in Snoqualmie, concluding a multi-year interchange improvement project with paving and striping work.
  • Crews will finalize the new diverging diamond interchange through three separate closures, focusing on final paving and striping to complete the project.
  • Each closure begins at 9 p.m. and reopens at least one lane by 5 a.m. Monday; The Tuesday before each weekend closure, one lane of State Route 18 closes at 9 a.m. for guardrail removal.
  • Beyond these directional closures, WSDOT will execute up to four weekend-long ramp closures, with a final striping weekend consisting of directional and ramp closures of up to eight hours each.
  • While this project concludes the interchange work, WSDOT continues widening State Route 18 between I-90 and Deep Creek, with a separate project to Issaquah-Hobart Road scheduled for completion in 2035.
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Federal Way MirrorFederal Way Mirror
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SR 18 closures coming as I-90 interchange project nears completion

After many years, the interchange improvement at State Route 18 and Interstate 90 is coming to a close, with final paving occurring soon.

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Mercer Island Reporter broke the news in Mercer Island, United States on Tuesday, April 21, 2026.
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