I caught some 5-6" gizzard shad with my cast net yesterday evening, right at dark, immediately below the dam at Lake Conway. They were trying to run upstream into the thin water onto the concrete base of the dam where the water was running.

I would think they would be gathering just about anywhere there was a weir or dam with some water flowing over or leaking through it.

Just a thought... Have you tried the dam on the White River at Batesville? I don't know if the cooler water from up north would affect the upstream run or not.