The U.S. Army Corps of Engineers Vicksburg District has a handy list of maps showing areas of expected flooding as the crest travels down the Mississippi River. Please note that this corps web site comes up with a giant white space where you would normally expect to see text. Scroll down to the map links, “Estimated Inundation Maps” below that white space. (They may be in the process of updating their web site.)
Once you click on one of the map links, mouse over the map until you see the “magnifying glasses” at the bottom. To zoom out, which you will want to do to get your bearings, click on the “minus” sign magnifying glass. There is a great deal of information on the site, and the maps are detailed. Here’s the link for you: U.S. Army Corps of Engineers, Vicksburg District.