American Bottoms 100

🏁 Welcome to the American Bottom

This is a unique road ultra on a beautiful course, following the Mississippi River, as you run through the historic American Bottom. Race headquarters is in Columbia, Illinois just outside of St. Louis, Missouri. The race offers a 110 mile and a 55 mile option.

🌅 Course Overview

• Pathway: The course will loosely follow the American Discovery Trail and the Kaskaskia - Cahokia Trail (Illinois' first road).
• Scenery: You’ll watch the sun rise over the Illinois bluffs while running on levees and deserted backroads, from Columbia to the confluence of the Kaskaskia and Mississippi Rivers.
• History: You’ll make your way through many historic sites, including Piggott's Fort, Fort de Chartres, and the town of Prairie du Rocher.
• Terrain: This is a flat and fast course with generous cut off times, plenty of aid stations, and a friendly atmosphere.

🏆 Race Options

110 MILE

• Start Time: 6:00 a.m. Start. Saturday March 21st, 2026
• Finish Time: 4:00 p.m. Finish. Sunday March 22nd, 2026
• Cut-Off: 34 hour cut-off
• Pace: 18:32 minute / mile pace
• Elevation Gain: 1,400 ft. total
• Course Type: Out & back course
• Surface: 76% levees / 24% hardball road
• Aid Stations: 17 Aid Stations

55 MILE

• Start Time: Saturday March 21st, 2026, 7:00 a.m.
• Finish Time: 10:00 p.m. Finish
• Cut-Off: 15 hour cut-off
• Pace: 16:21 minute / mile pace
• Elevation Gain: 700 ft. total
• Course Type: Point to point course
• Surface: 76% levees / 24% hardball road
• Aid Stations: 8 Aid Stations

💪 Get Ready!

This race will make a great first hundred miler, or a chance for you to set a new personal record at this distance. So, if you're interested in a no frills ultra with a low entry fee, then come test yourself this spring on the American Bottom.