I think most guys are going to be pretty protective of any small river spots, myself included whether it be the iowa, cedar, wapsi or any other... simply because it takes time and effort to find good walleye holes. You simply can't go and find old holes on a spot and catch fish on somebody's homework.
A lot of the spots I fish, I spend countless hours in the boat with a depthfinder, and camera locating good ice spots...
My best recommendation is to get out in the boat in your area during the fall, with a gps and look for fish and holes, that "should" ice up. If you don't have a boat, use a canoe, or float tube, or even just walk/wade the river. You can get a good idea of depth by how long it takes your jig to go to the bottom.