Have read mixed reviews on Athens a mostly dead lake.
Better is Mermet Springs IL at Metropolis IL, actually just over the river from Paducha, KY took me about easy 6 hours from Jackson, MS. Pretty clear water, very deep total granite quarry no mud really set up nice and there is even a sunken 727 among the various things put in the water. All connected by various lines and routes. Various entry points and u/w platforms. Also some huge spoonbills (prehistoric looking) and huge catfish and stuff. Super nice staff. Did it last October. Weather was fine.
www.mermetsprings.com
BTW There is a wicked thermocline, though. 42 deg below 35 feet or so.
Just something different for those wanting to.