American Bottoms 100
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Event overview
The American Bottoms 100 takes place in Columbia, Illinois on Saturday, March 21, 2026. The race offers two distances:
- 110 mile
- 55 mile
The race headquarters is at 11604 Bluff Rd, Columbia, IL 62236. Registration closes March 14, 2026.
Course and logistics
The route follows the Mississippi River through the American Bottom and loosely follows 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.
Course details differ by distance. The 110 mile is an out-and-back with about 1,400 ft total elevation gain, 17 aid stations, and a 34-hour cutoff. The 55 mile is point-to-point with about 700 ft total elevation gain, 8 aid stations, and a 15-hour cutoff. Surfaces are listed as 76% levees and 24% hardball road. Visit the organization's website for the most recent information.