Years ago I read the book that Buck Perry Wrote. Buck talked about the intersections of creeks and rivers. Normally my boat can't get out on the main lake at KY lake due to it's poor front end design. But one day it was dead calm and I ventured out onto the main lake. I headed for the mouth of Panther Creek. Now buck sold these spoon plug baits and my dad had bought a few of them. Dad also had a heavy duty trolling rod and lead core fishing line. So I hooked up the spoon plug to the line and started to troll across the mouth of Panther Creek in 30 ft of water right along the old River bed. I got a bit right away. It turned out to be about a 4 to 5 lb LM Black Bass. It threw the hook one it jumped the second time. This was midday IIRC. It made a Buck Perry believer out of me about the bass being out on the main lake at key creek/river junctions. I had just never tried trolling a spoon plug along the bottom in 30 ft of water. The fish are they, all you have to do is figure out how to get down to them.
Now I would have thought that the thermocline would keep the bass above about 25 ft but KY lake has a current that helps to break up the thermocline as they use the **** to generate electricity and area always letting water out of the gates. Every lake is different. And the guys at In-Fisherman will tell you this in all their books. I have several of their books. Crappie Wisdom is one. I have another about small mouth bass, And another about Largemouth bass. In all of them they talk about the distinct types of reservoirs and natural lakes. KY lake is a lowland reservoir. Patoka Lake is more of a highland type reservoirs without a current most of the time and has a thermocline that sets up in the lake.