Based on the latest information available, the boat ramp named Gregory County is located on the west side of the Missouri River at latitude 43.10058975 and longitude -98.76194 in South Dakota. This boat ramp is a concrete ramp that provides access to the river for boaters.

The Gregory County boat ramp is approximately 24 feet wide, which gives enough space for multiple boats to be launched and retrieved at the same time. It is a popular spot for fishing and boating enthusiasts in the area.

The boat ramp serves the Missouri River, which is a major river in the United States that flows through several states, including South Dakota. This river offers a variety of recreational activities, including boating, fishing, and swimming.

Boats of all kinds and sizes are permitted on the Missouri River, including motorized boats, kayaks, canoes, and sailboats. However, boaters are required to follow all state and local laws and regulations, including obtaining the necessary permits and licenses.

In summary, the Gregory County boat ramp in South Dakota is a concrete ramp that provides access to the Missouri River for boaters. It is approximately 24 feet wide and permits a variety of boats, including motorized boats, kayaks, canoes, and sailboats.