Look on flats in one to two and a half feet of water right next to the river channel. This time of year I won't waist my time in water deeper than 5'. The big ones seem to be most active starting around 10:00-11:00pm and last until around 1:30-2:00am this time of year. I've also done well in the early afternoon in those same types of spots.
Most cats, and especially the bigger ones come up out of the depths after dark and hunt for easy prey, and I usually start my night time cattin' around Memorial Day and it stays pretty consistent in those spots until around the end of July or so, then I start getting more in the deeper water right next to the shallow flats. Either way the flats always play into my fishing plan.
Also, if it's a big one you're after don't bother with stink baits, livers, etc.
Those baits work great for small to medium and even the occasional big cat, but for consistent big cats I ALWAYS go with as fresh as possible cut bait like carp, suckers, or chubs. I like a 1 1/2" x2" piece of cut bait at least 3/4" thick or sometimes even bigger. It sounds huge, but it isn't and actually keeps the dinks at bay.
Just my experience with them though, individual results may vary![
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Mike
P.S.
A boat make a night and day difference, less travelled spots pay off better!
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