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Posted on: October 1, 2022

Extended Traffic Alert: State Route 18 closures begin October 3 as infrastructure projects commence

Traffic Alert, WSDOT SR 18

The Washington State Department of Transportation (WDOT) issued the following Travel Advisory on Friday, September 30 for upcoming State Route (SR) 18 lane closures in October, 2022:

Starting Monday, October 3, crews will clear trees weekdays from 9 a.m. to 3 p.m. along the shoulder of westbound SR 18 from just west of the interchange to Deep Creek. The trees are being felled in preparation for widening SR 18 between Interstate 90 and Deep Creek as part of the I-90 and SR 18 interchange improvements project. After they're removed, WSDOT will work with area tribes to place the trees in nearby creeks to improve fish habitat. For a map and more information, visit WSDOT’s I-90 and SR 18 interchange improvements project webpage.

SR 18 lane closure

Drilling work for the SR 18 Issaquah/Hobart Road to Deep Creek widening project will require daily closures of the right lane of eastbound SR 18 through the end of October.

Beginning Monday, October 3, the lane will be closed daily from 9 a.m. to 4 p.m. Initially, the lane closure will begin at the Issaquah/Hobart Road interchange and extend two miles to Holder Creek at milepost 22.5.  The closure area will move farther east each week as drilling work is completed up to the Tiger Mountain summit.

The drilling work will gather information about the soil under the highway in preparation for future widening. For a map and more information, visit WSDOT’s SR 18 Issaquah/Hobart Road to Deep Creek widening project webpage.

Two projects will improve SR 18 corridor and I-90 interchange

The $665 million SR 18 project will widen the highway to two lanes in each direction between Issaquah-Hobart Road and Deep Creek where it will connect to the wider lanes built as part of the $188 million I-90 interchange improvements project. The SR 18 widening project could start construction as early as 2025, after the new I-90/SR 18 interchange is complete. The projects are designed to work together to provide travelers with a better travel experience over SR 18 and through the I-90 interchange.

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