The Lower Susquehanna River encompasses the area south of a line beginning at the east end of the old railroad bridge, at or near Lat. 39° 34.323' N., Long. 76° 4.822' W., then running 242° (True) to the east shore of Garrett Island, at or near Lat. 39° 34.243' N., Long. 76° 5.013' W., east of a line running southerly along the shore to the south end of Garrett Island, at or near Lat. 39° 33.552' N., Long. 76° 5.107' W., then north and east of a line running 178° (True) to the AMTRAK railroad bridge, at or near Lat. 39° 33.285' N., Long. 76° 5.095' W., then running 69° (True) to the east end of the AMTRAK railroad bridge, at or near Lat. 39° 33.382' N., Long. 76° 4.775' W. This area has a 6-knot speed limit all year.