A Coal Valley man died in a snowmobile accident Sunday night near Barstow, Ill.
Rock Island County Coroner Brian Gustafson identified the man as 29-year-old Christopher Alstedt.
An autopsy Monday concluded the preliminary cause of death was due to traumatic head and neck injury, Gustafson said.
"It's a very sad situation," he said.
The coroner's office and the Illinois Conservation Police are handling the ongoing investigation.
Alstedt was operating a snowmobile heading west on a frozen Zuma Creek when he attempted to clear the 227th Street North bridge and struck his head, Illinois Conservation Police Capt. Robert Frazier said.
"Another guy ahead of him had made it, but for whatever reason he didn't clear," Frazier said.
The Rock Island County Sheriff's Office and East Moline Police Department responded to the scene.
Alstedt was transported to Genesis Medical Center, Silvis, where he was pronounced dead.
Frazier said there have been five snowmobile fatalities in Illinois this season, including one last week in Hancock County when a man struck a ditch and flew off the snowmobile.
In another last month in McDonough County, a man was operating a snowmobile in the dark without a headlamp when he crashed into a barbed wire fence and died from his injuries.
A Rock Falls, Ill., rider died Feb. 1 near Mercer, Wis. In Iowa, a Preston snowmobiler perished in an accident about 2 a.m. Feb. 2 near Miles.
"These trails are not like the highway," Frazier said. "It's unknown terrain. You never know the conditions ahead of you."