not sure exactly where are the good spots, but I have caught them on the cumberland below old hickory. Will be going for walleye on thursday below cordell hull, and I bet there are plenty of sauger in there as well.
We accidentally caught some sauger below cordell hull a few weeks ago when we were striper fishing. If your going to go up into the tailwater, make sure they aren't blasting on the cliffs, they will run you off if they are.