IPB,
there are plenty of companies that hydraulically dredge with either divers or floating dredges. This is normally much less disruptive than mechanically dredging with a excavator, etc. If you are brave and don't mind the hard work, you can do it yourself with a good 6 or 8" trash pump and some silt fence. If you want to talk to someone in IL, look up Sediment Removal Systems in IL or call Warren, the president direct at 815.341.0099.
