As shared by the Washington State Department of Transportation (WSDOT), the right lane of westbound State Route 18 at Interstate 90 will close nightly from 9 p.m. to 5 a.m., Sunday evenings through Thursday mornings beginning Tuesday, February 3, and continuing for the next 12 weeks.
Construction crews working for Puget Sound Energy will install new electrical lines and equipment during these closures.
No detours are necessary, but people traveling in the Snoqualmie and North Bend area should expect possible delays while crews complete this work.
Improving traffic flow and safety
The I-90/SR 18 Interchange Improvements project built a diverging diamond interchange and widened SR 18 to two lanes in each direction between I-90 and Deep Creek to help improve traffic flow and safety through the busy corridor.
The project is expected to finish in mid-2026. Crews will place a top layer of asphalt and install permanent striping along the widened section of SR 18, through the diverging diamond and on the I-90 on- and off-ramps once weather dries and warms next spring.
Real-time travel information is available via the WSDOT mobile app, the WSDOT Travel Center Map or by signing up for WSDOT's email updates.