A crash closed all northbound lanes of Interstate 5 near Wilsonville Thursday morning, the Oregon Department of Transportation said.
Emergency personnel responded to the crash at around 6:15 a.m., 1 mile north of Wilsonville.
Oregon State Police said a semi-truck driver in the southbound lanes has crossed into the northbound lanes and crashed into several vehicles.
Tualatin Valley Fire and Rescue said it was responding to a crash involving several vehicles in the area. The crash is between the Wilsonville Road and Elligsen Road exits.
Avoid the area and use alternate routes.