I heard there isnt even a thermocline at all on KY/Barkley because so much current flows through. The water gets from pickwick through KY dam so fast (maybe 9 days?) that a theremocline never even forms. I could be wrong but its just like an oversized river and thats why no thermocline sets up, but thats just what Ive read from studies etc on the lake. Never experienced it myself so I dont know but seems to make sense.