After conducting some research, I was unable to find any specific information on a boat ramp named McLean County in North Dakota with the given latitude and longitude coordinates. It is possible that the coordinates are incorrect or that the boat ramp is not a well-known or publicly listed location.

Therefore, I cannot accurately answer the questions about the type and width of the boat ramp, the body of water it services, and the permitted types of watercraft. Without this information, it is difficult to provide a thorough discussion of this particular boat ramp.

However, in general, boat ramps are typically designed to allow boats and other watercraft to be launched and retrieved from a body of water, such as a river, lake, or ocean. They come in a variety of sizes and designs, from small, shallow ramps for small boats to larger, steeper ramps for larger boats and trailers. Many boat ramps are also equipped with parking areas, restrooms, and other amenities for boaters and visitors.

It is important to note that boaters should always check with local authorities and follow any posted regulations at a particular boat ramp or on a specific body of water. This may include restrictions on the types of watercraft allowed, speed limits, and safety requirements such as life jackets and fire extinguishers.