American Bottoms 100
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American Bottoms 113
American Bottoms 113 is a road ultramarathon held in Columbia, Illinois, along the Mississippi River through the historic American Bottom. Race headquarters are in Columbia, just outside St. Louis, Missouri. The event offers two distance options:
- 113 Mile
- 56 Mile
The course loosely follows the American Discovery Trail and the Kaskaskia - Cahokia Trail. Runners travel on levees and backroads toward the confluence of the Kaskaskia and Mississippi Rivers, passing historic sites such as Piggott's Fort, Fort de Chartres, and Prairie du Rocher.
Surface and format details are provided by the organizers: the route is approximately 51% pavement and 49% gravel. The 113-mile course is an out and back with 1,591 ft of total elevation gain and 17 aid stations. The 56-mile course is point to point with 791 ft of total elevation gain and 8 aid stations. Organizers list cut-off times of 35 hours for the 113-mile distance and 17.5 hours for the 56-mile distance, with an 18:30 minute per mile pace guideline.
Early-registration incentives include free entries for the first two veterans or first responders, a 30% discount for the first three registrants using code EARLY, and a 15% veteran and first responder discount. Visit the organization's website for the most recent information.
