When I did Charles Mound in 1990 or 91, the mound was totally off limits due to the death of the owner of the land and the land/mound was in probate, so therfore closed off to the public. That's the story I heard, when I was there. So, after driving all the way from NY and on a HP swing I was determined to find an other way. I looked at the map I had, and ended up parking at a hairpin turn to the NW in Wisc., hiked along a barbwire fence on the Wisconsin side to the top of the hill, crossed the fence then headed due south to the top of Charles Mound, then retraces my steps. No problems except for cow pies.