A man from the Worden area was partially ejected from his car when it rolled on Tuesday morning in Huntley Project near the intersection of Stanhope Road and Highway 312.
The call came in at 5:46 a.m., according to Montana Highway Patrol.
He was the only person in the vehicle at the time of the crash, said MHP Sgt. Tony Beehler.
The man was eastbound when he drifted off the right side of the road for unknown reasons, Beehler said. He struck the end of a small concrete bridge and went into the roadside ditch.
At the time of the crash, the man was probably wearing a seat belt, but he was discovered partially out of the driver’s side window by first responders, Beehler said.
The man was conscious and breathing when he was discovered. He had serious injuries, but they were probably not life threatening, Beehler said. He was transported to St. Vincent Healthcare by ambulance.
Whether speed or alcohol were factors is still under investigation.