The Washington State Department of Transportation (WSDOT) is advising residents who travel through the I-90/SR 18 interchange area to expect four nights of lane and ramp closures beginning Monday, March 10, near Snoqualmie. These closures are part of WSDOT's 90/18 Interchange Improvements Project.
Travelers should plan for delays and follow instructions from police officers, work crews and construction signs in the area during the following lane and ramp closures:
- SR 18/Snoqualmie Parkway on-ramp to eastbound I-90: The ramp will close from 9 p.m. Monday, March 10, to 5 a.m. Tuesday, March 11. A signed detour will use westbound I-90 and loop around at Preston/Fall City (exit 22) to eastbound I-90.
- Eastbound I-90: The left two lanes will close from 9 p.m. Tuesday, March 11, to 1 a.m. Wednesday, March 12, near the SR 18 interchange. The right two lanes will close from 9 p.m. Wednesday, March 12, to 12:01 a.m. Thursday, March 13.
- SR 18/Snoqualmie Parkway: SR 18/Snoqualmie Parkway will be reduced to a single lane in each direction under the I-90 bridges from 11 p.m. Tuesday, March 11, to 4 a.m. Wednesday, March 12. SR 18/Snoqualmie Parkway will be reduced to a single lane with flaggers alternating traffic under the I-90 bridges from 9 p.m. Thursday, March 13, to 4:30 a.m. Friday, March 14.
- Eastbound I-90 off-ramp to SR 18/Snoqualmie Parkway: The ramp will close from 9 p.m. Wednesday, March 12, to 5 a.m. Thursday, March 13. A signed detour will continue eastbound on I-90 to Winery Road/Southeast North Bend Way (exit 27) and loop around to use the westbound I-90 off-ramp to SR 18/Snoqualmie Parkway.
During the closures, contractor crews will install signs and work on traffic signals and loops, conduit and road crossings in the area. This work is part of the I-90/SR 18 Interchange Improvements project, which is building a diverging diamond interchange and widening more than two miles of SR 18 to two lanes in each direction south of I-90.