I think I'm going to set up a old fish finder I was give (thank you Rippin'lips) on a PVC pole and use a small 12v battery and walk along both sides of the bridge and see what's going on down their. Before the magnet fishers were their I pretty well knew where to fish, but since they disturbed everything I haven't caught much. It only has down scan but we will see. I agree with what your saying on the moving around and realize that for what ever reason some pilons hold fish and some don't. Next time I go I'll get some pictures. wish I could put a boat in and fish it properly, but don't have the $1000.00 fine and don't want my boat conficated...so It's lean over the top and cast under as far as you can. I have learned to skip a jig pretty good and can get pretty far under. That's how I caught that 13.75 inch crappie.
If I could get around better, I would get me some snake proof boots and work the west bank. I don't like nor trust snakes at all. So I am only fishing the bridge at this lake. I had thought their might had been an old creek channel, but previous trips with that fish finder (like a year or so ago) proved that their is none. The bottom slopes from one end to the other and no channel.