UPDATE: SR 18 Closure Canceled
The nearly six-day closure of State Route 18 at I-90, originally scheduled for May 15–21, has been canceled due to forecast rain. According to WSDOT, the work requires dry conditions and will be rescheduled for a later date. We’ll share the new closure window as soon as it’s announced.
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Note*- We first shared news of this closure earlier this month, but with the May 15 start date fast approaching, it’s worth another look. This isn’t a typical lane restriction—The section of SR 18 will be fully closed under I-90 for almost six days, cutting off a major east-west connection near Snoqualmie. If you travel this corridor, plan ahead now to avoid major delays.
State Route 18 will be closed in both directions under the Interstate 90 bridges for almost SIX days beginning Thursday night, May 15.
All people traveling through the I-90/SR 18 interchange from 9 p.m. Thursday, May 15, to 5 a.m. Wednesday, May 21, should expect delays and add time to their travel plans.
This five-day closure will help position the I-90/SR 18 Interchange Improvements project to complete construction of a diverging diamond interchange this summer south of Snoqualmie. The work requires dry weather and may be rescheduled.
Closure details
During the closure:
- No traffic will be allowed along either direction of SR 18 under the I-90 bridges.
- 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.
Westbound I-90 freight traffic should either use Preston Fall City (exit 22) or High Point Way (exit 20) to loop back on eastbound I-90 to westbound SR 18. Freight traffic can also continue west on I-90 and use southbound I-405. Freight traffic should not use Issaquah city streets or Issaquah-Hobart Road, which are not suitable for semi-trucks.
During the closure
Contractor crews working for the Washington State Department of Transportation will install new drainage and electrical crossings, pave the new roadway, and build concrete islands forming the southern portion of the new I-90/SR 18 diverging diamond interchange.
Work also includes building a left turn pocket for traffic turning from westbound SR 18 onto Southeast 104th Street and a signalized U-turn south of I-90 that will allow eastbound SR 18 traffic to head westbound toward Auburn. Both will be operational when SR 18 reopens Wednesday, May 21.
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]
