UPDATE: Eastbound and westbound State Route 18 is now open to alternating traffic in both directions with a pilot car, from Interstate 90 to Issaquah-Hobart Road Southeast.
Updated Saturday 330 PM: Eastbound and westbound SR 18, from I-90 to Issaquah-Hobart Road SE, remains closed from an earlier collision. Crews are working on guardrail repairs. There is no ETA for reopening. Continue to use alternate routes.
Original Story
Drivers should expect significant delays and use alternate routes. There is no estimated reopening time.
An update will be provided as more information becomes available.
Check WSDOT updates for real-time traffic conditions.