This September 1957 article from Willys News highlights an 11 mile jeep race as part of the World Championship Burro races that year (Burro races are still held). The course was originally from Leadville to FairPlay over Mosquito Pass, but heavy snows shortened the course from Alma to FairPlay.

If I read the article correctly, Denver’s Mile High Jeep Club had 600 members in 1957? No wonder it was considered the largest jeep club in the world!

This map roughly highlights how far the race was. Cutting the race back to Alma shortened it considerably.