Based on the available information, the boat ramp named State Highway 15 10187 is located in Nelson County, North Dakota. The coordinates provided indicate that it is located at latitude 47.80280685 and longitude -98.39698792.

As for the type of boat ramp it is, there is no specific information available. However, it can be assumed that it is a public boat ramp accessible to anyone, including visitors and locals.

The width of the boat ramp is also not specified, but it is likely to be wide enough to accommodate several types of boats.

The body of water that the boat ramp services is not explicitly stated, but it is likely to be one of the nearby lakes or rivers in the area. Nelson County is home to several bodies of water, including Devils Lake, which is the largest natural lake in North Dakota.

In terms of the types of crafts permitted on the water, it depends on the specific regulations and rules of the body of water being accessed. However, it is likely that the boat ramp allows for the launching of various boats, including motorboats, fishing boats, canoes, and kayaks, among others.

Overall, without more specific information, it is difficult to provide a complete and accurate description of the boat ramp named State Highway 15 10187 in Nelson County, North Dakota.