So there has been talk of removing a couple of the dams in the Huron River Watershed. The dams in question are Argo Dam at the north end of Ann Arbor and the Mill Creek Dam in Dexter. I think it would be great. The Dams on the Huron do provide nice flatwater sections, but this part of the state has plenty of that nearby. The Argo Dam is 18 feet above the previous rapids that once existed there. I would love to see some good whitewater in downtown Ann Arbor. It would also serve as a good excuse to let Bridgit let me get a whitewater canoe. The only thing nearby are the Delhi rapids which are ok, but get crowded sometimes.
Here is a study by the Huron River Watershed Council, and another done by the School of Natural Resources (where my Mother did her undergrad BTW)