I'm pretty new around here but I know people get pretty upset about you getting in the water (Stream/River/Lake) in the St. Louis area. Found this Jeep making its way up a stream in the Ward Canyon Area on YouTube and considering He has to run down some vegetation to do it; I assume this is not a designated trail.
http://www.youtube.com/watch?v=9Zxw4M1FPT4
http://www.youtube.com/watch?v=9Zxw4M1FPT4