All eastbound lanes of I-90 were closed for hours at Cabin Creek, which is about 10 miles east of the Snoqualmie Pass summit.
Three people died in a vehicle crash Thursday on Interstate 90 in Washington.
A semi-truck traveling west crossed over the median and struck a passenger car that was traveling east, Trooper Collin Cumaravel said. The driver of the truck, Danny Ellingford, 42, of Pasco, was not injured.
Ellingford was driving a truck with UPS logos. UPS in a statement said they are saddened and extend their sympathies to those involved.
"We are cooperating with the responding authorities in their investigation. Because this is an active investigation, we will defer to authorities for any further comment," the statement said.
Eastbound I-90 was closed into Thursday afternoon "due to the severity of the fatal collision," transportation officials said.