Nonetheless, the homesteads nearby correlate well with the Harrison Landing depicted on Plates 13.
I would thereby believe that their boat backtracked some 3.5 miles down river from City Point to Harrison's Point/Landing. This is some 9 miles distance from Dutch Gap to the West.
Harrison's Point is on the North bank of the river some 8 miles West from Charles City Court House.
Jordan's Point and Light House is on the opposite side of the river.
I do not have available any large scale maps of the area to pinpoint it's present day position.
George Martin