What species of fish are we talking about, here ??
According to this : http://www.lrl.usace.army.mil/wc/wq/grr.html ... the thermocline is around the 20ft depth, so I'd say find water of 20ft deep or less, and try slow moving baits/methods (seeing as how the water temps are still in the 80deg range, even at the 20ft depths).
.... pappy