Pavement repair project on SR 18 and ramps across King and Snohomish counties begins September 11th

project to repair and preserve pavement beginning work in mid-September will improve the driving surface along a 5-mile section of State Route 18 east of Maple Valley and at on- and off-ramps across King and Snohomish counties.

Contractor crews working for the Washington State Department of Transportation will seal cracks and make pavement repairs, creating a smoother ride and extending the lifespan of roadways at 15 locations in King and Snohomish counties.

Work will begin Monday, Sept. 11, on SR 18 before the project takes a winter pause and resumes next spring to improve on- and off-ramps at the remaining 14 locations in King and Snohomish counties.

The repairs on SR 18 will require all lanes in each direction to close for up to three nights, though eastbound and westbound lanes will not close simultaneously.

SR 18 closures

Between 11 p.m. and 4 a.m. nightly beginning Monday, Sept. 11, all eastbound lanes of SR 18 will close near Issaquah-Hobart Road Southeast to just south of Raging River (mileposts 21 to 26).

Work on eastbound lanes is expected to take up to three nights before crews swap and close all westbound lanes of SR 18 for up to three additional nights to make similar repairs.

Nightly work will continue from 11 p.m. to 4 a.m. Mondays through Fridays until it is completed. Signed detours will be available for both travel directions, but people should expect delays and consider alternate routes.

SR 18 detours

  • Eastbound SR 18: Follow Issaquah-Hobart Road Southeast north to Front Street in Issaquah and use the on-ramp to eastbound Interstate 90.
  • Westbound SR 18: Follow I-90 westbound to the Front Street exit in Issaquah and head south to Issaquah-Hobart Road Southeast and SR 18.

People traveling in the area also should expect nightly work that is part of the I-90/SR 18 Intersection Improvements project between 9 p.m. and 5 a.m. Flaggers will alternate SR 18 traffic on Mondays through Fridays just south of I-90. Real-time travel information is available via the WSDOT mobile app, the WSDOT Travel Center Map, or by signing up for WSDOT’s email updates.

[Information provided by the Washington State Department of Transportation]

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