The eastbound lanes of Interstate 90 are now reopened just east of Stateline, although heavy traffic remained backed up into Washington as of 3:30 p.m.
Authorities said the freeway was partially blocked from a two-vehicle accident that occurred near Stateline around 1:30 p.m.
At least one of the vehicles reportedly rolled over, a Idaho State Police dispatcher said.
Idaho State Police, Post Falls Police and the Idaho Transportation Department were at the scene and cleared the freeway about 3 p.m., when both eastbound lanes were reopened.
During the blockage, the Washington State Patrol reported a traffic backup as far west as Liberty Lake.