The West River proper and its tributaries, except South Creek, encompass the area upstream of a line beginning at the north entrance of Tenthouse Creek, at or near Lat. 38° 50.902' N., Long. 76° 32.222' W., then running 100° (True) to a point, at or near Lat. 38° 50.832' N., Long. 76° 31.718' W., and north and west of a line beginning at the east side of Chalk Point, at or near Lat. 38° 50.257' N., Long. 76° 32.230' W., then running 113° (True) to a point, at or near Lat. 38° 50.118' N., Long. 76° 31.813' W., then running 5° (True) to a point, at or near Lat. 38° 50.223' N., Long. 76° 31.802' W., and running to the head of the river. This area has a 6-knot speed limit Saturdays, Sundays, and State holidays, all year.