Seattle, WA : A major collision on May, Thursday, 18th 2017

A major collision on eastbound Interstate 90 has caused a half mile of back up on the highway.
The crash happened near mile-post 53 is near the Snoqualmie Pass summit, and any one headed that way should expect major delays.
Washington Department of Trasnportation (WSDOT) did not disclose what caused the crash, but noted that it was adding at least 20 minutes of travel time to eastbound traffic over Snoqualmie Pass.

Source :
Major collision on I-90 causes half-mile back-up