There seems to be an error in the question. Point Detour Campground and Lake Superior are located in the Upper Peninsula of Michigan, not in Illinois. Therefore, the correct information is as follows:

The boat ramp named Lake Superior - Point Detour Campground Launch is located at latitude 46.96015549 and longitude -90.87336731 on the shores of Lake Superior. This boat ramp is managed by the Michigan Department of Natural Resources and is open year-round.

The ramp is a concrete launch with a single lane and is suitable for small to medium-sized boats. It is also wide enough to accommodate vehicles with trailers. The launch has a parking lot with ample space for vehicles and trailers.

Lake Superior is the body of water serviced by this boat ramp. It is the largest freshwater lake in the world by surface area and is known for its crystal-clear waters and beautiful scenery. The lake is popular for fishing, boating, and other recreational activities.

As for the kind of craft permitted on the water, the Michigan Department of Natural Resources allows all types of motorized and non-motorized watercraft on Lake Superior, including kayaks, canoes, sailboats, and powerboats. However, operators of personal watercraft (PWC) are required to abide by specific rules and regulations.

In conclusion, Lake Superior - Point Detour Campground Launch is a well-maintained boat ramp that provides access to the beautiful waters of Lake Superior. It is suitable for small to medium-sized boats, has ample parking space, and allows all types of motorized and non-motorized watercraft on the lake.