As of a few days ago it was still open . I believe the campground is closed & nobody at the front gate , but lake lake is still open to fish.
Another option & for you & possibly a better one is Raccoon Lake About 12 mile East of Rockville. The Crappie are starting to come on strong there.
The South End provides useful resources and discussion forums for those that fish The South End of Lake Michigan for Salmon, Steelhead, Perch, and Bass as well as elsewhere in the Region and Chicago area.