<P> In addition to the Ohio River , the major tributaries of the Lower Mississippi River are the White River , flowing in at the White River National Wildlife Refuge in east central Arkansas ; the Arkansas River , joining the Mississippi at Arkansas Post ; the Big Black River in Mississippi ; and the Yazoo River , meeting the Mississippi at Vicksburg , Mississippi . The widest point of the Mississippi River is in the Lower Mississippi portion where it exceeds 1 mile ( 1.6 km ) in width in several places . </P>
what is the width of the mississippi river
1 mile ( 1.6 km )