Officials with the Iowa Department of Natural Resources say a Grand Junction man was seriously injured Sunday afternoon while snowmobiling west of Boone along U.S. Highway 30. 35-year old Damion Louk was third in line of five snowmobiles traveling eastbound in the median of the highway,when the left front ski caught deep snow near a culvert snapping the connections and sending him and the snowmobile air born.

Louk was traveling at an estimated speed of 60 miles per hour and was thrown approximately 150 feet before landing near the shoulder of the highway. Authorities say they believe his helmet may have not been fastened, as it came off during the incident and landed separately. Louk was transported to Boone County Hospital where he was later transferred by helicopter to Mercy Medical Center in Des Moines.

The incident remains under investigation. Deputies with the Boone County Sheriff’s Office, members of the Iowa State Patrol and Iowa Department of Natural Resources assisted at the scene.