The Washington State Department of Transportation (WSDOT) has scheduled a weekend-long closure of the SR 18/Snoqualmie Parkway on-ramps to westbound I-90 that will begin Friday night, April 25, at 9 p.m. and end at 5 a.m. Monday, April 28. During the closure, contractor crews working for WSDOT will relocate barriers, pave new roadways, and stripe a new alignment along SR 18/Snoqualmie Parkway. The work is weather-dependent and may be rescheduled.
Please be advised, to avoid potential traffic backups at the I-90/SR 18 interchange during the weekend-long ramp closure, Snoqualmie residents are urged to use alternate routes to access westbound I-90, including the milepost 27 on-ramp near historic Snoqualmie or the milepost 22 on-ramp in Preston.
WSDOT's designated detour during the closure will route people to a signed detour using eastbound I-90 to Winery Road/North Bend Way (exit 27) and loop around to westbound I-90. Travelers should add travel time to their plans and follow instructions from work crews and construction signs in the area.
When the ramps reopen Monday morning, all lanes of SR 18/Snoqualmie Parkway north of I-90 will bend to the west and return straight underneath the I-90 bridges. This is the next step in building the northern end of a diverging diamond interchange.
This work is part of the I-90/SR 18 Interchange Improvements project, which, in addition to building the new interchange, is:
- Widening more than two miles of SR 18 to two lanes in each direction from I-90 to Deep Creek.
- Building new four-lane bridges at Lake Creek and Deep Creek that will allow fish and wildlife to pass beneath SR 18.
- Constructing a new two-lane SR 18 bridge over Raging River next to the existing two-lane bridge.
The new diverging diamond interchange is scheduled to open this summer, with SR 18 widening expected later this year.