The World's longest
non-stop river race

The MR340 perfectly fits Missouri River Relief’s mission to safely engage individuals and communities along the Missouri River in the exploration, enjoyment, restoration and care of the river through education, stewardship, and recreation. 

The MR340 isn't just a race, it's where ordinary people discover extraordinary capabilities. From Kansas City to St. Charles, paddlers navigate the mighty Missouri through day and night, summer heat, and unpredictable weather, all within an 85-hour time limit.

This is where preparation meets possibility. Where meticulous planning confronts the wild unpredictability of America's longest river. Where strangers become allies and competitors become lifelong friends.

But when your boat touches the Missouri River on race day, you enter a world where spreadsheets meet sandbars, where GPS coordinates meet gut instinct, and where the most carefully calculated adventure becomes something far more profound.

Since 2006, the MR340 has challenged paddlers from around the world to test themselves against the Big Muddy's relentless current. Veterans return year after year, drawn by the river's uncompromising lessons and the unmatched community that forms between checkpoints.

Whether you're a seasoned paddler or a first-time racer, show the world what you are made of with your own MR340 schwag. Perfect gift for the MR340 obsessed in your life.