Washington State Patrol says the driver of the truck, Ricardo Reyes Lopez of Moses Lake, lost control just after 7:30 a.m. and hit an unoccupied street sweeper parked in the right lane, which was closed to traffic due to construction. The truck then sideswiped a Cadillac sedan and hit a pickup truck from behind.
The truck overturned, spilling hay onto the roadway and blocking the westbound lanes.
The driver of the truck was not injured. The other two drivers, Juana Rangel Alvarado of Mattawa and Eric Brindle of Quincy, were taken to Quincy Valley Medical Center for treatment.
Crews were able to clear the roadway around noon.
The cause of the crash is still under investigation. WSP says it does not believe alcohol or drugs played a factor.