A Belle Fourche man died early Monday in a one-vehicle crash on Interstate 90 at Exit 10 near Spearfish.
Greg Alan Baier, 35, was westbound driving a 1987 Ford F150 pickup when the vehicle left the roadway near Exit 10. The vehicle struck a snow gate and overturned, coming to rest on its wheels between the westbound driving lanes and the westbound off-ramp.
Baier, who was not wearing a seatbelt, was thrown from the vehicle and died at the scene.
The South Dakota Highway Patrol is investigating. Spearfish Police Department assisted.