Good question. I always hear that bass head out to deeper waters (following the shad) after the spawn. But take Cedar Creek for example, didn't they kill all of the shad before impoundment? So the majority of bass are feeding on bluegills and shellcrackers right? So I would expect the bass to still be more shallow there than other places since bluegills spawn after the bass.

I know I've had some luck fishing shallow all summer around grass even in the middle of the day, I guess some bass would rather ambush frogs, snakes, and crayfish up in the grass rather than chase down shad out in deeper water.

I'd say if you can find grass close to deeper water that would be a gold mine.

Thats my take, maybe somebody will give us a better answer.