There's one on the north side of Dundee Rd. just east of Milwaukee. There's tons of smaller bass in there and THOUSANDS of bluegills, but there are supposedly some nice fish in there if you hunt for em'
I believe the place that krnfishboy7786 is refering to is Potawatomi. It's a small lake with lots of bluegill for sure, but I have seen pictures of bass up to 20" caught there. Just not sure how many are there. I have caught bluegill there as small as 2" many years ago so the bass have plenty of small fish to eat for sure.