If you do venture out on these rivers, the sugar River is very shallow in most parts in Illinois. The only access to it I know of is just south of Shirland on the Pec River. Put your boat in and head north on the Pec for a bit and the mouth of the sugar comes in. It's a popular River for canoeing, kayaking, and people floating down on intertubes. The Pec River has it's shallow spots as well with lots of debris in it. Access spots that I know of to the Pec are the one by Shirland,1 launch in Pecatonica Forest Preserve, 2 launches in Pecatonica, 1 in Freeport. There's a couple more in Stephenson county but I don't recall the names of the town's they're in or near. I recommend using a short shaft motor for the Pec and a trolling motor on the Sugar. Like rism said, check regs before hunting.