State Route 18 will be reduced to a single lane with alternating traffic overnight Wednesday, May 28, and Sunday, June 1, south of Snoqualmie for paving and lane striping.
The work will signal a long-awaited milestone for the Interstate 90/State Route 18 interchange improvements project, as contractor crews working for the Washington State Department of Transportation will move SR 18 traffic onto two new bridges. The switch will happen over the two nights of lane reductions.
Lane reduction details
People should expect flaggers and pilot vehicles to alternate eastbound and westbound SR 18 traffic near the new Raging River and Deep Creek bridges from:
- 9 p.m. Wednesday, May 28, to 5 a.m. Thursday, May 29.
- 9 p.m. Sunday, June 1, to 5 a.m. Monday, June 2.
Westbound SR 18 traffic will shift onto the new bridges Wednesday night, with eastbound traffic moving onto the bridges during the Sunday night lane reduction. The paving and striping work is weather-dependent and may need to be rescheduled if rain is expected.
SR 18 five-day closure
In addition to the overnight lane reductions near Raging River and Deep Creek, both directions of SR 18 will close for five days around the clock near I-90 to build the southern end of a new diverging diamond interchange.
From 9 p.m. Thursday, May 29, to 5 a.m. Wednesday, June 4, no SR 18 traffic will be allowed under the I-90 bridges. During the closure:
- All eastbound SR 18 traffic must take the on-ramp to eastbound I-90.
- All westbound SR 18 (southbound Snoqualmie Parkway) traffic must take the on-ramp to westbound I-90.
- No left turns will be permitted onto SR 18 at the bottom of the eastbound or westbound I-90 off-ramps.
People can detour around the closure using eastbound and westbound I-90 and loop around at:
- The Southeast North Bend Way (exit 27) interchange to the east.
- The Preston-Fall City (exit 22) or High Point (exit 20) interchanges to the west.
In addition to the new interchange and bridges over Raging River and Deep Creek, the project built a new four-lane bridge over Lake Creek and is widening more than 2 miles of SR 18 to two lanes in each direction between I-90 and Deep Creek. The new diverging diamond interchange is scheduled to open this summer, with the widening of SR 18 finishing later this year.
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.
[Information provided by the Washington State Department of Transportation (WSDOT)]
