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Posted on: January 31, 2024

Traffic Advisory: Weeknight SR 18 lane reductions begin Jan. 31 near Tiger Mountain summit

SR 18 Lane Closure Traffic Advisory Graphic

Snoqualmie residents who travel on SR 18 should prepare for overnight delays beginning January 31, 2024, lasting through March. The Washington State Department of Transportation (WSDOT) will reduce SR 18 to a single lane, with alternating traffic on weeknights, over the next two months near Tiger Mountain summit as work begins on the last of three bridges to widen a 2-mile section of SR 18 just south of I- 90.

Beginning Wednesday night, January 31, the westbound lane of SR 18 will close from 9 p.m. to 5 a.m. Monday nights through Friday mornings until the end of March. People should plan for up to 20-minute delays, as a pilot vehicle will alternate traffic through a single lane along a 2-mile stretch between Lake Creek and Deep Creek.

During the lane closures, contractor crews working for WSDOT will begin work on a new four-lane bridge at Deep Creek. Crews also will continue work on the new two-lane bridge that will span Raging River and have already finished the new four-lane bridge crossing Lake Creek, just south of I-90.

The new bridges replace culverts that blocked fish passages in Deep Creek and Lake Creek and create pathways for wildlife to pass under the highway instead of across it.

Work at the interchange
As SR 18 widening continues, crews also are working at the I-90 interchange on drainage systems and drilling foundations for the new diverging diamond sign bridges.

This work is part of WSDOT's work to widen the entire 7-mile stretch of SR 18 between I-90 and Issaquah-Hobart Road Southeast. The current project will redesign the SR 18/I-90 interchange into a diverging diamond interchange and widen the first 2 miles of SR 18 to the south of I-90. It is expected to finish in 2025.

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