The Washington State Department of Transportation (WSDOT) is asking drivers to plan ahead for a major road closure in the Snoqualmie area.
Starting at 9 p.m. Thursday, May 15, through 5 a.m. Wednesday, May 21, both directions of SR 18 beneath the I-90 bridges will be closed to all traffic to allow crews to build the southern end of a new diverging diamond interchange.
Truckers can follow the WSDOT-recommended detour for commercial traffic:
People can detour around the closure using eastbound and westbound I-90 and loop around at the Preston-Fall City (exit 22) and Southeast North Bend Way (exit 27) interchanges. Westbound I-90 freight traffic should use either the Preston-Fall City exit to loop back and take westbound SR 18 or continue on westbound I-90 to southbound I-405. Freight traffic should not use Issaquah city streets or Issaquah-Hobart Road, which are not suitable for semi-trucks. Similarly, eastbound SR 18 freight traffic cannot use Issaquah city streets to access I-90.
While I-90 traffic will not be affected by the closure, WSDOT asks drivers to be aware of the following:
- Vehicles will not be permitted on either direction of SR 18 beneath the I-90 bridges.
- Traffic on the eastbound I-90 off-ramp will only be able to turn south onto westbound SR 18. No left turns onto eastbound SR 18/Snoqualmie Parkway will be allowed.
- Traffic on the westbound I-90 off-ramp will only be able to turn north onto Snoqualmie Parkway or continue onto the westbound I-90 on-ramp. No left turns onto westbound SR 18 will be allowed.
- Eastbound SR 18 traffic must use the eastbound I-90 on-ramp and follow a detour.
- Southbound traffic on Snoqualmie Parkway must use the westbound I-90 on-ramp and follow a detour.
You can learn more about the SR 18 closure here.
