Island boats from the Carolinas to the Dry Tortugas, the free crossing at Galveston, and river ferries from Louisiana to Kentucky.
The Southern crossings on this site share little beyond the fact that each one stands in for a road that is not there. Bald Head Island, off Southport in North Carolina, keeps most engines off its streets, so a private ferry regulated by the state Utilities Commission carries almost everyone, with bags checked much as at an airport and a tram waiting at the island marina. Daufuskie, the last South Carolina sea island before the Georgia line, has no road connection of any kind; Beaufort County pays a contractor to run a passenger boat from Pinckney Island, and every seat is booked one direction at a time. Across the state line, the Savannah Belles are Chatham Area Transit boats that carry anyone over the Savannah River between River Street and Hutchinson Island.
The rest are river crossings. Gee's Bend, in a loop of the Alabama River, lost its boat to Camden in 1962, in what the Encyclopedia of Alabama describes as an effort to stop Black residents registering to vote, and got a new one from ALDOT in 2006. Virginia's Merry Point Ferry is a cable-guided VDOT boat over the western end of the Corrotoman, with one operator, a midday lunch break and no service on Sundays or Mondays. Kentucky's Green River Ferry, inside Mammoth Cave National Park, is cable-guided too and run by the Park Service, and it stops when the river runs too low or too high. The fares tell them apart as well: Gee's Bend charges by the car, Bald Head Island sells a round trip with the tram included and Daufuskie sells each leg on its own, while Merry Point, under a Virginia act of 1847, charges nothing at all, the Belles are fare-free and the park lists no fee for its ferry.
Along the Gulf, the Galveston–Port Bolivar ferry carries State Highway 87 free of charge at any hour, and the boat to the Dry Tortugas leaves Key West once a day at 8:00 a.m., on an adult fare of $260 that already covers the national park entry.