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The Chain of Rocks Bridge has become the permanent home of our Spring Duathlon. Originally held on the historic Eads Bridge we re-located the event to a longer bridge and a more rural bicycle course. The iconic Chain of Rocks Bridge and surrounding area is the perfect venue to ease into an active event season. The event starts and finishes at the foot of the Chain of Rocks Bridge on the Illinois side. Participants will run from Start Line to the Mississippi River and back, followed by a flat, fast out and back bike circuit, returning to a final out and back run leg to the river and back with great views of the mighty Mississippi River. Awesome, right?!

Download our Athlete Guide for the nitty gritty details.


Pre-register online. Deadline for a GuaranTEEd event shirt is April 22nd.
In person at Big Shark’s Big Bend Location 12pm – 5pm Saturday, May 1st
RACE DAY at the Chain of Rocks Bridge Parking Lot on the Illinois side from 7:30am – 8:30am
RACE DAY- arrive EARLY- we start and park at the Eastern/Illinois entry to the Chain of Rocks Bridge! RACE will go on rain or shine. We’ve cast our vote for shine, but it will be happening either way!

Distances: 1.5 mile run – 12 mile bike – 1.5 mile run. A great distance for beginners and seasoned veterans.

Where: The Chain of Rocks Bridge – and rural roads on the Illinois side of the Mississippi River.

When: Sunday May 2nd, 2021 at 9:00 AM

Chain of Rocks Bridge Duathlon Registration Details-

Before January 1st, 2021 Individual $55/Team $75
January 1st – Feb. 1st Individual $60/Team $80
Feb. 2nd – May 1st Individual $65/Team $85
Race Day May 2nd Individual $70/Team $90
Athletes registered by April 22nd are guaranteed an Event Shirt. Entries after the deadline are NOT guaranteed shirts.

Team Options:

Two person teams- one person does the run legs and the other does the bike segment


Three person teams – one person does the first run leg, 2nd person does the bike leg, and a 3rd person does the final run.

ALL participants will have a timing strip on their Bib Number. To have accurate times, numbers must be worn through the duration of the race. Teams will pass the number from one member to the next using a race belt. If teams don’t have a race belt, Big River will loan one to them to be returned after the race. Participants must be over 16 years old.

Packet Pick-Up Options:

Saturday, May 1st: Big Shark Bicycle Company, 1155 South Big Bend Blvd, 63117, 12pm-5pm

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