Based on the latest available information, the boat ramp named Lower Nemahbin Lake -- Boat Landing is a concrete boat ramp located on the shores of Lower Nemahbin Lake in Waukesha County, Wisconsin. It has a width of approximately 16 feet, which allows for easy launching and retrieving of boats. The coordinates for the boat ramp are latitude: 43.05348969, and longitude: -88.43836212, which can be used to locate it on a map.

This boat ramp services Lower Nemahbin Lake, which is a 643-acre lake known for its fishing, boating, and recreational activities. The lake is located in the Village of Summit in Waukesha County and is surrounded by several residential properties and public parks.

As for the kinds of craft that are permitted on the water, the exact information is not available on the latest sources. However, it can be assumed that the boat ramp is open to a variety of watercraft, including small boats, kayaks, canoes, and motorized boats. It is always best to check with the local authorities before launching any watercraft to ensure compliance with local regulations and safety guidelines.

In conclusion, the Lower Nemahbin Lake -- Boat Landing is a concrete boat ramp located on the shores of Lower Nemahbin Lake in Waukesha County, Wisconsin. It is approximately 16 feet wide and services the lake for various recreational activities. While the exact information on permitted watercraft is not available, it is safe to assume that a wide range of boats and watercraft are allowed on the water.