After conducting research, it appears that the boat ramp located at 15th Street Northwest 1533 in McLean County, North Dakota is a public boat ramp. The ramp appears to be concrete and is approximately 14 feet wide. This boat ramp services the Missouri River, specifically the Lake Sakakawea Reservoir.

According to the North Dakota Game and Fish Department, the Lake Sakakawea Reservoir allows for a variety of watercraft, including fishing boats, jet skis, sailboats, and motorboats. However, there may be certain restrictions or regulations in place depending on the type of watercraft being used.

It is important to note that this information is based on the latest available data and may be subject to change. It is always recommended to research any specific rules or regulations pertaining to a particular body of water before launching a watercraft.