113 mi56 miRegistration open

American Bottoms

Saturday, March 20, 2027Columbia, Illinois

Aid stations: 9
Days to go: 165

At a glance

Date: Mar 20, 2027
Location: Columbia, Illinois
Distances: 113 mi, 56 mi
Aid stations: 9, 5 with crew access
Registration: Registration open, via ultrasignup.com
Official site: americanbottomsultra.com
Listed from: RunSignUp
Last checked: Oct 4, 2026

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9 aid stations are already loaded. Add cutoffs, pacing and the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.

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About this race

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.

The course will loosely follow the American Discovery Trail and the Kaskaskia - Cahokia Trail (Illinois' first road). 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. You’ll make your way through many historic sites, including Piggott's Fort, Fort de Chartres, and the town of Prairie du Rocher.

This is a flat and fast course with generous cut off times, plenty of aid stations, and a friendly atmosphere. It 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.

110 MILE

6:00 a.m. Start. Saturday March 21st, 2026

4:00 p.m. Finish. Sunday March 22nd, 2026

34 hour cut-off

18:32 minute / mile pace

1,400 ft. of elevation gain total

Out & back course

76% levees / 24% hardball road

17 Aid Stations

55 MILE

Saturday March 21st, 2026

7:00 a.m. Start

10:00 p.m. Finish

15 hour cut-off

16:21 minute / mile pace

700 ft. of elevation gain total

Point to point course

76% levees / 24% hardball road

8 Aid Stations

Key dates

Registration opens

May 1, 2026

Race day

Mar 20, 2027

165d

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Registration openings and major changes, like a new date or a cancellation.

Aid stations

Station	Distance	Cutoff	Supplies
B Rd Mile 6.6 outbound / mile 107 return (113 mile course). No crew, drop bag, or restroom access listed.	6.60 miles	--	quesadillassoupfruitcandy+3
Garleb Rd Mile 12.7 outbound / mile 100.9 return (113 mile course). Drop bag, crew/pacer, and restroom access. Cutoff of 1:10 PM Sunday (31 hrs 10 min) applies at mile 100.9 on return.	12.70 miles	1:10 PM	quesadillassoupfruitcandy+3
Fountain Mile 17.8 outbound / mile 95.8 return (113 mile course). No crew, drop bag, or restroom access listed.	17.80 miles	--	quesadillassoupfruitcandy+3
Mitchie Rd Mile 24 outbound / mile 89.6 return (113 mile course). No crew or drop bag access listed. Cutoff of 9:40 AM Sunday (27 hrs 40 min) applies at mile 89.6 on return.	24.00 miles	9:40 AM	quesadillassoupfruitcandy+3
Ivy Rd Mile 30.5 outbound / mile 83.1 return (113 mile course). Drop bag, crew/pacer, and restroom access. Cutoff of 3:30 PM Saturday (9 hrs 30 min) applies outbound.	30.50 miles	3:30 PM	quesadillassoupfruitcandy+3
Fort de Chartres Mile 37.8 outbound / mile 75.8 return (113 mile course). Drop bag, crew/pacer, and restroom access. Cutoff of 5:25 AM Sunday (23 hrs 25 min) applies at mile 75.8 on return.	37.80 miles	5:25 AM	quesadillassoupfruitcandy+3
Prairie du Rocher Mile 42 outbound / mile 71.6 return (113 mile course). Crew and restroom access. No drop bag access.	42.00 miles	--	quesadillassoupfruitcandy+3
Ste. Genevieve Mile 49.2 outbound / mile 64.4 return (113 mile course). No crew, drop bag, or restroom access listed.	49.20 miles	--	quesadillassoupfruitcandy+3
Kaskaskia Mile 56.8 — turnaround for 113 mile course, finish for 56 mile course. Drop bag, crew/pacer, and restroom access. Cutoff of 11:30 PM Saturday (17 hrs 30 min). Pacers may be picked up here for the 113 mile race.	56.80 miles	11:30 PM	quesadillassoupfruitcandy+3

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