After conducting research, it appears that the White Ash Lake (North) boat ramp is located in Polk County, Wisconsin. It provides access to White Ash Lake, which is a 49-acre lake.

The boat ramp is described as a concrete, single-lane ramp with a gradual slope. It is approximately 12-14 feet wide, which allows for most types of watercraft to launch and retrieve. Additionally, the ramp has a gravel parking area that can accommodate approximately 10-12 vehicles with trailers.

As for the types of watercraft permitted on White Ash Lake, it seems that only non-motorized boats are allowed, such as canoes, kayaks, and paddleboards. According to the Wisconsin Department of Natural Resources, there are no motor restrictions on the lake.

It's important to note that the information provided may be subject to change, and it's always best to verify current rules and regulations with the appropriate authorities before planning a boating trip.