Check here for current river levels. I think you will need the guage height under ZERO FEET in order to not get wet when retrieving the cache. "Mississippi River level at Chester"
Cache is not appropriate for small kids and dogs due to the nature of the approach.
Had trouble getting a good satellite lock, so alternate coordinates are 37 37.925, 089 30.873 (maybe). Please advise of coordinates.
Take a picture of yourself with the camera but please don't take the camera.