Snoqualmie residents should plan for traffic slowdowns and intermittent lane closures the week of Jan. 30 at the I-90/SR 18 interchange as the Washington State Dept. of Transportation (WSDOT) ramps up construction on the Interchange Improvement Project.
Contractor crews working on behalf of WSDOT will place traffic advisory signs near the interchange and will conduct drilling operations on westbound SR 18 just north of the Tiger Mountain summit.
Closure Information
- Daily from 8 am to 3 pm, Monday, Jan. 30 to Saturday, Feb. 4, workers will close the westbound SR 18 truck climbing lane for geotechnical drilling. Crews are preparing to widen SR 18 from Issaquah-Hobart Road to just north of the Tiger Mountain summit and could begin as early as 2025.
- From 7 a.m. to 3 p.m. each day, Monday, Jan. 30 to Wednesday, Feb. 1, crews will conduct short duration left lane closures on I-90 in both directions near the interchange.
- From 7 a.m. to 3 p.m., Tuesday, Jan. 31 and Wednesday, Feb. 1, expect short duration shoulder closures on SR 18, in both directions, between the interchange and about two miles to the south.
Contractor crews will place traffic advisory signs throughout the I-90/SR 18 project area.
This work is in preparation for the construction of a new diverging diamond interchange, the second in the state, which will improve traffic flow and safety for travelers who use this busy corridor. Additionally, WSDOT’s contractor, Aecon, will widen a two-mile stretch of SR 18 south of the interchange. Construction at the interchange begins this spring and the project is expected to be complete in early 2025.