To clarify that for others not familiar with the situation: On the Virginia side of Great Falls, which is where this great photo was captured, there is the Great Falls National Park. On the Maryland side of the falls, there is the Chesapeake & Ohio National Historical Park, which is named to honor the Chesapeake & Ohio Canal, which has 185 miles of it in the park. That park is located partly in West Virginia, partly in Maryland and partly in Washington, D.C. I don't remember ever hearing of a bridge anywhere connecting the two parks. Both parks are administered by the National Park Service.There is a national park on both sides of the river, though the two parts of the park are not connected by a bridge at that point.
That ferry runs from 0500 to 2300 except when the water is too high and running too fast to make a safe crossing. It's the last of the 100 ferries that used to cross the Potomac River that is still in operation.The only way to get across the Potomac between the Beltway and Point of Rocks MD, probably 35-40 miles upstream, is a rickety old ferry, Whites Ferry, near Leesburg VA.