I see more walleye and ski come from the dam area in Yorkville, as opposed to bass. If you're looking for cats, pretty much everywhere else up-river from the dam till you get to the tail-end of Saw Wee Kee Park is good water to kayak or float for cats. Some holes above the dam are over 5 feet deep so wading isn't a great idea. I'm sure there are flatheads around below the dam, but I see way more caught above.