Starting at the confluence of the Missouri and Kansas rivers, the Missouri American Water MR340 is one of the world's longest nonstop river races. But behind the curtain, the Kansas City District, U.S. Army Corps of Engineers, has played a vital role in making sure the river is ready for racers and commercial navigators alike. This story highlights the decades-long partnership with race organizers and the unique perspective of district employees who have experienced the Missouri River both as stewards of its navigation system and as MR340 competitors.