According to the North Dakota Game and Fish Department website, the boat ramp named Nelson County is located on the east side of the south end of Devils Lake in Nelson County, North Dakota. It is a concrete boat ramp that is 12 feet wide.

The body of water it services is Devils Lake, which is a large lake located in the northeastern part of the state. Devils Lake is approximately 95,000 acres in size and has a maximum depth of 59 feet. It is a popular destination for fishing, boating, and other recreational activities.

As for what kind of craft are permitted on the water, the North Dakota Game and Fish Department states that all types of watercraft are allowed on Devils Lake, including motorized and non-motorized boats, canoes, and kayaks. However, it is important to note that there are some regulations and restrictions in place for certain types of watercraft and activities, so it is always a good idea to check with local authorities before heading out on the water.

Based on the latest information available, it appears that the boat ramp named Nelson County is a well-maintained and accessible launch site that provides boaters with easy access to the popular and scenic Devils Lake.