Based on the information available, the Dewitt Road-Cedar Grove boat ramp is located in Wisconsin and has a latitude of 43.60160446 and a longitude of -87.76496887. The ramp appears to be a concrete boat launch ramp that is open to the public.

The width of the ramp is not specified in the available information, but it appears to be wide enough to accommodate most types of watercraft. The ramp likely has space for several boats to be launched at once, but parking availability may be limited.

The Dewitt Road-Cedar Grove boat ramp services Lake Michigan, which is a large body of freshwater that borders several states in the eastern United States. Lake Michigan is known for its excellent fishing opportunities and is a popular destination for boaters and other water sports enthusiasts.

As for what kind of craft are permitted on the water, this information is not explicitly stated in the available information. However, it is likely that most types of watercraft are allowed on Lake Michigan, including powerboats, sailboats, kayaks, and canoes, among others. It is always recommended to check with local authorities or park officials to determine any specific restrictions or regulations that may apply to a particular body of water.