On most lakes there is a definent thermacline that set up in the summer. But in the fall and winter months it goes away meaning cats can be anywhere the oxygen and bait is. The 80 lber in my avatar came from 85ft. and I've caught many 20 and 30 lbers from 100 to 110 ft. in the winter. So for the sake of conversation, What is the deepest water you've caught a catfish in?