Between Minneapolis and Saint Louis, Mo., the most important tributaries are the Illinois, Chippewa, Black, Wisconsin, Saint Croix, Iowa, Des Moines, and Rock rivers, some of which drain the nation's most fertile agricultural areas. The Missouri River drains the Great Plains to the west and joins the Mississippi at Saint Louis. It is the longest tributary, and constitutes more than 40% of the Mississippi drainage area. More than 50 cities and 18 million Americans depend on the Mississippi and its tributaries for drinking water. For communities along its 2,300-mile course, the river is a vital economic, recreational, and natural resource.
822 1/2 E. River Dr.
Davenport, Iowa 52803