UPDATE: The incident has been cleared from the road, WSDOT announced at 10:31 a.m.
ORIGINAL POST: Traffic on southbound Interstate 5 is backed up for four miles as authorities respond to an incident near the Pierce-Thurston county line, according to the state Department of Transportation.
The backup started at 9:14 after a wreck, the agency tweeted. The right lane is blocked and traffic has been reduced to one lane.
"Give yourself some extra time to get through the area," the agency tweeted.
This story will be updated as more information becomes available.