Web Author's Notes:
This map provides a larger view of the battlefield.  The 16th OVI marched with Gen. Morgan's troops south along Chickasaw Bayou and toward the heavily defended bluffs.  Note that the Union troops entered the Yazoo River at its mouth on the Mississippi on December 26 enroute to their disembarkation point. Due to the Mississippi River changing its course in April, 1876, the city of Vicksburg was left without a riverfront.  The Corps of Engineers began work in 1878 to re-route the Yazoo River so that it would fill the old bed of the Mississippi River in front of Vicksburg, thus restoring its riverfront.  This action resulted in the mouth of the Yazoo River emptying into the Mississippi River directly in front of Vicksburg instead of several miles up river.  Had the Mississippi changed its course before 1862, the Battle of Chickasaw Bayou may never have happened.

The following map taken from Battles and Leaders of the Civil War: III: Retreat from Gettysburg, by Robert Underwood and Clarence Clough Buel, New York, The Century Co. 1884-1887.