Not my usual territory (I'm more of a ghost/NDE person) but I did fall down a rabbit hole on this a few weeks back after someone sent me a video from near St. Louis.
What's weird is how consistent the descriptions are. The height, the way it allegedly moves, the red eye shine. I've seen that same detail come up in reports from completely different people who don't seem to know each other.
My mate thinks its just misidentified bears standing upright but the witnesses who've had close encounters are pretty insistent it moves nothing like a bear. The fluid movement thing keeps coming up.
Anyone here actually been out to do fieldwork along that stretch of river? I'd love to know what the terrain is actually like, whether it would even support something that size hiding out long term.