Authorities believe John F. Hauser was involved in the accident, which was reported at 2:30 a.m. He apparently walked away from the accident before responders arrived on the scene.
Hauser did not show up for work Friday and could not be located. An aerial and foot search of the area turned up nothing.
Hauser has a lung condition that occasionally impairs his ability to breathe, according to family members.
Anyone with information regarding Hauser's whereabouts is urged to contact the Bayfield County Sheriff's Department at (715) 373-6120.