Sometimes knowing where they aren't is as useful as knowing where the fish are!
I was up there a little over a week ago and concentrated on the upper end where the river "used" to come in. I tried to fish trees, brush. submerged islands, and the old river channel with no luck. Not sure what I would catch there so I used a couple different wiggle tail jigs in green, white, etc. Swam them, dropped them, dragged them, only a couple hits. Also tossed out some catfish bait on a lindy rig with no success.
Water was 8-10 feet. Wish I'd a brought along some dynamite! (lol)