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Based on the latest information available, the Oak Harbor boat ramp is located in Jacksonville, Florida, with a latitude of 30.35618591 and a longitude of -81.42825317. It is a public boat ramp that provides access to the Intracoastal Waterway.

The Oak Harbor boat ramp has a concrete launch ramp and a courtesy dock, and it is approximately 20 feet wide. It can accommodate small to medium-sized boats and has parking spaces for vehicles and boat trailers.

The Intracoastal Waterway that the Oak Harbor boat ramp services is a network of bays, rivers, and canals that extends along the East Coast of the United States, from Florida to New Jersey. It is a popular destination for boaters, fishermen, and other water enthusiasts.

As for the type of craft permitted on the water, it depends on the regulations of the local authorities and the size of the boats that the ramp can accommodate. However, in general, common watercraft allowed on the Intracoastal Waterway include powerboats, sailboats, kayaks, canoes, and paddleboards.

In summary, the Oak Harbor boat ramp is a public launch ramp located in Jacksonville, Florida, that provides access to the Intracoastal Waterway. It is approximately 20 feet wide and can accommodate small to medium-sized boats. The Intracoastal Waterway is a popular destination for various types of watercraft, including powerboats, sailboats, kayaks, canoes, and paddleboards.