The Associated Press
A 20-mile backup has formed on westbound Interstate 90 as travelers return Monday to the Puget Sound region from Memorial Day excursions.
The backup goes from about milepost 86 in the Roselyn area to milepost 105 near Ellensburg, said Summer Derrey with Washington state Department of Transportation.
Drivers should expect a two-hour delay if they are heading west.
The department doesn’t expect the backup to clear until Monday night.
Derrey says the heavy traffic is solely caused by travelers. There aren’t any reports of collisions or closures along that stretch of I-90.