It also altered the course of the Mississippi River - and didn’t it run backwards too?
There are those that say the Mississippi River ran backwards. The more reasonable explanation is that it ran sideways for awhile. Reelfoot Lake in northwest Tennessee was formed from this. If the river had actually run backwards Reelfoot Lake would probably stretch to the Cumberland Plateau
A sufficiently large or sufficiently long lasting tsunami tidal bore type wave on top of the usual Mississippi water would have looked to folks of that era in that location as though the river was ‘running backwards,’
imho.