ive been fishing for about 7 yrs now on the ohio, all different depths. I have heard people talk about how DEEP holes are the best to fish in when i started out and still til today. I have a hole around me that, depending on the amount of rain obviously, hits from 75 to 85 ft. deep. when i first found it i thought i had hit a goldmine until i fished it. i fished and fished and never caught a thing til last year, 1 flathead at 28 pounds. ive drifted over it many of time and as all holes at the beginning of the drop ive caught blues. it is surrounded by 45 to 55 ft of water. but after the first initial drop over the front, i mean when you actual get into the 80 ft, never catch a thing throughout the whole thing which is about lil over 100 yds long. ive anchor fished it many of time and spent plenty enough time there to gimme chances to catchem if there down there. ive heard of the thermacline but i havent studied about it to much. ive always caught fish in depths of 65 but never much over that. just want to hear a few opinons or facts all the same, thanks and good luck in the upcoming year to all.