A rollover crash is blocking all lanes of southbound State Route 167 at State Route 516 near Kent.
Drivers are getting by on the shoulder, the state DOT reports.
Troopers, firefighters and transportation crews are on the scene.
UPDATE: The crash is now blocking the two left lanes of southbound SR 167 AND the two left lanes on the on-ramp to southbound SR 167. The backup is currently 5 miles.
Drivers are encouraged to take alternative routes or to expect delays through the area.
FINAL UPDATE: All lanes and the on-ramp to southbound SR 167 are now open.