Linn County Sheriff Tim Mueller told KATU-TV, Portland, the helicopter landed upside down near Blowout Road, not far from Idanha, which is on Highway 22 east of Salem.
It wasn't clear if the pilot was the only person on board, Mueller said.
A Forest Service law enforcement officer was on the scene and investigators with the Federal Aviation Administration had been notified, the TV station said.
Trader Joe's: Car crashes into Long Island store, injuring 11
Wisconsin business offering 'therapeutic cuddling' forced to close