The Jefferson Highway was completely blocked for hours at Jefferson, as a tractor hauling a hay trailer crashed on the bridge over the Santiam River at about 1 p.m. Tuesday.
As of 5 p.m. Tuesday, the roadway was expected to remain closed for at least a few more hours.
No injuries were reported in the wreck, said Tammy Robbins, Jefferson Fire District spokeswoman.
Tractor driver Eric Dunphy told fire personnel that the farm equipment was headed over the bridge when a truck hauling a trailer crossed over the center line. The tractor driver moved to the right to avoid the rig and hit the side of the bridge with a tire, Robbins said.
Chunks were taken out of two of the bridge pillars during the crash, but Robbins was unsure how significant the damage was. Oregon Department of Transportation engineers inspected the span on Tuesday.
The driver of the truck and trailer did not stop, according to a news release.
The tractor spilled a full tank of diesel, and nearby Knife River Corporation brought in a load of sand to keep the fuel from spreading down the roadway.
No fuel got into the water, Robbins said.