Each year, hundreds of adventurous paddlers brave 340 miles of the Lower Missouri River within a matter of 3 1/2 days as part of the annual Missouri American Water MR340 race hosted by Missouri River Relief. As the world’s longest non-stop river race, MR340 is a test of endurance. It is also an opportunity for people around the nation and world to learn more about the Missouri River and how the Kansas City District, U.S. Army Corps of Engineers manages the lower Missouri River Basin. Within the training all paddlers must do before the race, a warning is given to keep an eye out for the structures along the Missouri River including dikes, chutes and revetments. These structures are placed and maintained by the Kansas City District, so the Missouri River is able to self-maintain a navigation channel.