It happened in the Turtle Township between Beloit and Clinton.
The Rock County Sheriff's Department says 47-year-old Jeffery Weatherall was traveling on County Highway X when he drove his motorcycle off the shoulder and hit an asphalt driveway Saturday afternoon.
The impact sent him and the cycle airborne for over 70 feet. They traveled another 56 feet after hitting the ground.
Weatherall was not wearing a helmet and died on the scene. Authorities say alcohol may be a factor.