Based on the latest information available online, the Green Rd boat ramp in Florida is a concrete boat ramp that provides access to the St. Johns River. It is approximately 30 feet wide and can accommodate various sizes of boats. The St. Johns River is a large body of water that is approximately 310 miles long and runs throughout Florida. The river is known for its diverse fishery and is popular for recreational activities such as boating, fishing, and sightseeing. All types of watercraft are permitted on the St. Johns River, including powerboats, sailboats, canoes, and kayaks. It is important to note that regulations and restrictions may apply depending on the specific area of the river and the type of watercraft being used.