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The Washington State Department of Transportation (WSDOT) will close westbound SR 18 from 9 p.m. to 5 a.m. Monday nights to Friday mornings starting Wednesday, Jan. 31, through the end of March. People should plan for up to 20-minute delays, as a pilot vehicle will guide traffic through a single lane along a 2-mile stretch between Lake Creek and Deep Creek, just east of Tiger Mountain summit.
In addition to starting work on the new four-lane bridge at Deep Creek, contractor crews are making progress installing bridge columns for the new two-lane bridge that will span Raging River and already have completed the new four-lane bridge crossing Lake Creek near the interchange.
The new bridges replace culverts that blocked fish passage in Deep Creek and Lake Creek. They also create pathways for wildlife to pass under the highway instead of across it.
Work at the interchange
As SR 18 widening continues, crews are also working at the interchange on drainage systems and drilling foundations for the new diverging diamond sign bridges. In March, WSDOT will erect the sign bridges overnight, so stay tuned for traffic closures related to that work as plans firm up.
This work is part of WSDOT’s ongoing effort to widen the entire seven-mile stretch of SR 18 between I-90 and Issaquah-Hobart Road Southeast. The current project will build a new diverging diamond interchange and widen the first two miles of SR 18 to the south of I-90. It is expected to be complete in 2025.
For questions on these projects, please contact the I-90 Project Team via email, at I90-SR18Interchange@wsdot.wa.gov, or phone, at (206) 216-4545.