Troopers responded to the scene, Highway 512 near Portland Avenue, at about 9:10 p.m. after receiving a report of an accident blocking all westbound lanes of the highway.
Arriving at the scene, they found a 2007 Kenworth dump truck had become stuck on the cable barrier and managed to stretch it across all westbound lanes, bringing traffic to a halt.
A preliminary investigation found that the driver of the dump truck, a 37-year-old Mountlake Terrace man, was heading west on Highway 512 just west of Vickery Avenue when he veered to the left, striking the cable barrier.
The truck kept going against the barrier, causing it to become stuck underneath the truck's left tires. The truck finally stopped at Portland Avenue, with the cable barrier stretched out behind, blocking all lanes of travel.
The truck driver was arrested for investigation of DUI.
Trooper Guy Gill said the cable barrier prevented the dump truck from crossing over into the eastbound lanes, where it could have caused a serious accident.