Navigation is one of the eight authorized purposes of the Missouri River that mandates the Corps of Engineers to manage the navigation channel between Sioux City, Iowa and St. Louis, Missouri. The Rivers and Harbors Act of 1945 calls for a 9-foot deep and minimum 300-foot wide channel.
Today, the focus of the Corps of Engineers navigation mission is to provide safe, reliable, efficient and environmentally sustainable waterborne transportation system for movement of commerce, national security needs and recreation. In order to meet this mission, the Corps focuses on repairs to river structures from damage such as ice, debris, scouring and high water velocity.