Snowmobiling is the fastest growing winter sport in North America. At present (August 1972) there are approximately 350,000 snowmachines registered in the State of Michigan which is an increase of 45% from one year ago. (1)* There are approximately 2,150,000 snowmachines in the United States of America. (2) Due to the rising use of snowmachines a project on the evaluation of injuries associated with snowmobiling was undertaken for the season of 1971-72.