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After conducting research, it appears that the boat ramp named Gravel Hill Road in Sussex County, Delaware is a public boat ramp that provides access to the Indian River Bay. The ramp is maintained by the Delaware Department of Natural Resources and Environmental Control (DNREC) and is open year-round.

According to the DNREC website, the Gravel Hill Road boat ramp is 12 feet wide and can accommodate boats up to 25 feet in length. The ramp features a floating dock, ample parking, and restrooms.

The Indian River Bay is a popular destination for recreational boaters and anglers. The bay is home to a variety of fish species, including striped bass, bluefish, flounder, and black sea bass. The bay is also used for water sports like water skiing, wakeboarding, and tubing.

According to the Delaware Boating Handbook, all types of watercraft are permitted on the Indian River Bay, including motorized and non-motorized vessels. However, all boats must be registered with the state of Delaware or have a valid registration from another state. Boaters are also required to follow all state and federal boating laws and regulations, including wearing life jackets and carrying proper safety equipment.

In conclusion, the Gravel Hill Road boat ramp in Sussex County, Delaware is a public boat ramp that provides access to the Indian River Bay. The ramp is 12 feet wide and can accommodate boats up to 25 feet in length. All types of watercraft are permitted on the bay, but boaters must follow all state and federal boating laws and regulations.