Investigators are still searching for the cause of the brush fire.
Two lanes of the freeway were closed for hours, and an eight-mile backup had formed in the northbound lanes by 7 a.m. Monday. One lane was reopened by 9 a.m., and the backup had shrunk to about two miles by 11:45 a.m.
Firefighters initially responded to the scene, just north of South 188th Street, at about 11:30 p.m. Sunday.
Flames shot 30 feet into the air and grew to about three acres as drivers watched firefighters try and knock them down. By 6:30 a.m. Monday, crews were still dousing hot spots.
No structures were threatened. Eventually units from Tukwila, SeaTac, Federal Way, Port of Seattle and Boeing Fire Department assisted in the firefight, with approximately 40 firefighters.
Fire officials are using the opportunity to remind drivers that extreme fire conditions currently exist, not just in Central and Eastern Washington, but in the greater Seattle area and all of Western Washington.