I really only kayak the river usually going in at the launch off Milwaukee road across from Allgauer's or from the spillway that runs into it from Big Bend lake. Along the shoreline at Allgauer's you can still see the concrete structures from when Villa Venice offered gondola rides back in the days when the Rat Pack did a gig there. As far as kayaking goes I can tell you that with the dams gone, going back upstream is no longer a leisurely ride even when the water is low. There used to be an impassable log jam between Central and Dam2 which looks gone now. On Google maps it used to be visible and now it isn't. Paddling upstream near OCC there were times it was near impossible to beat the current under that railroad trestle and once even in fairly low water I had to get out and drag it a ways.
I have not been in a couple years. The last time I went dam #2 although mostly gone was still moving most of the water through a small portion on the west side for some reason. My guess is that with the dams gone and even if the river was low a trip from around Dundee to Miner and back would be a haul back upstream. Lots of wildlife, three types of herons, egrets, mink, beaver, deer, great horned owls, fox, coyotes,...