Man Strikes Tree in Snowmobile Accident Late on Sunday, the West Yellowstone Police Department received a call reporting a single snowmobile crash. The crash was reported about five miles north of West Yellowstone near the Madison Arm of Hebgen Lake. A 43-year-old man had suffered injuries when the snowmobile he was riding left the trail and struck a tree. Gallatin County Sheriff Search and Rescue volunteers in West Yellowstone responded. The snowmobiler was transported in a specialized rescue stretcher to a Hebgen Basin Rural Fire District ambulance. He was then taken to Big Sky Medical Center. The man suffered a possible broken shoulder and punctured lung from the incident.