For normal temperature years, the river usually will not rise to significant levels until ice out up north. This usually occurs around the beginning of March. It also takes quite a while for the rising water levels to reach Memphis. If you take a look at some of the upstream gauges, you will see that levels are fairly high. This water will make it down here soon.
We have had a significant shortage of rain lately, so that may have some influence (lots of rain the past few weeks but no runoff into the river because the ground isn't saturated). If you have had any shortages up north, that will definitely have an influence.
Not to worry though, the river will almost certainly make it up to the right level before your trip.