Oh, there's structure on Poygan. Just gotta be aware. Little dip? Probably better. Warmer water? Probably way better. Remember a 1 foot difference in a lake with a max depth of 11 feet (good luck finding that) is about 10%. Consider that against average depth of 6 feet it's a 17% change.
There's better than average pike, walleyes, crappies and white bass to be had.