American Bottoms 100
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American Bottoms
American Bottoms is a road ultramarathon held in Columbia, Illinois, that follows the Mississippi River and runs through the historic American Bottom. Race headquarters are in Columbia just outside St. Louis, Missouri. The event offers two distances and uses levees and quiet backroads, with sections that follow the American Discovery Trail and the Kaskaskia - Cahokia Trail.
The course passes several historic sites, including Piggott's Fort, Fort de Chartres, and the town of Prairie du Rocher. Surfaces are roughly half pavement and half gravel, and the terrain produces modest total elevation gain for each distance. The event provides multiple aid stations along the routes and sets time cut offs and pace thresholds for each distance.
- 113 Mile, 35 hour cut off; 1,591 ft elevation; out and back; 17 aid stations
- 56 Mile, 17.5 hour cut off; 791 ft elevation; point to point; 8 aid stations
Field sizes are limited to 30 runners for each distance. A 15 percent discount is available for veterans and first responders; participants must contact the organizer for a coupon code. Entry fees vary and the event is scheduled for March 20, 2027 in Columbia, Illinois. Visit the organization's website for the most recent information.
