American Bottoms 100
Always double-check with the organizer's website! This page may contain affiliate links.
American Bottoms
American Bottoms is a road ultramarathon scheduled for March 20, 2027 in Columbia, Illinois, near the Mississippi River. The event offers two distances and limits entries to 30 runners per distance. A 15% veteran and first responder discount is available. Entry fees are listed in a range from USD 82.18 to USD 163.25.
The course follows sections of the American Discovery Trail and the Kaskaskia - Cahokia Trail through the historic American Bottom. Runners pass levees, local backroads, and several historic sites including Piggott's Fort, Fort de Chartres, and Prairie du Rocher.
Key course and event details are:
- 113 Mile: out and back, 35 hour cut-off, 1,591 ft gain, 17 aid stations
- 56 Mile: point to point, 17.5 hour cut-off, 791 ft gain, 8 aid stations
The routes are approximately 51% pavement and 49% gravel. The 113 Mile course totals about 1,591 feet of elevation gain while the 56 Mile course totals about 791 feet. Both courses publish generous cut-off times and a published target pace of 18 minute 30 second per mile. Registration closes March 13, 2027. Visit the organization's website for the most recent information.
