I-55 South, exit Lorenzo Road west (exit #240),Go about 4 miles and follow the signs.
Fish the rip-rap. ha ha. Be careful. Remember it's a cooling lake, which means it's "perched", designed to catch the wind. It gets rough in a hot minute.
There's a bait shop/concession stand that also rents boats. I believe Sam Palumbo still runs it. Call (815)942-4000 for information.