All of the waters of the Chesapeake and Delaware Canal, east of a line beginning at a point on the shore of Welch Point, at or near Lat. 39°31.466'N., Long. 75°52.681'W., then running 137° (True) to a point on the southern shore of Back Creek, at or near Lat. 39°31.181'N., Long. 75°52.343'W.; and west of the Maryland-Delaware State line, beginning at a point on the north shore of the canal, at or near Lat. 39°32.197'N., Long. 75°46.769'W., then running 176° (True) to a point on the south shore of the canal, at or near Lat. 39°32.077'N., Long. 75°46.759'W. The Maryland portion of the canal shall have at all times a maximum speed limit of 35 knots sunrise to sunset and 20 knots sunset to sunrise for all watercraft.