Ohio Rev. Code Ann. § 4583.10

A person obtaining a license to keep a ferry shall provide and keep in complete repair a sufficient boat for the safe conveyance of persons and property. When the stream over which such ferry is kept is passable, he shall give due attendance from daylight in the morning until dark in the evening with sufficient hands to manage such boat. During the day he shall cross the stream at intervals of not longer than fifteen minutes when a person desires passage. At any hour in the night or day that the river can be passed, when called upon therefor, he shall convey the United States mail or other public express across such ferry.