The waters of the Columbia River between Sand Island and Government Island, bounded on the west by pile dike U.S. 5.75 and a line extending true north from the northerly end of the dike to the south shore of Sand Island and bounded on the east by a line bearing 339°15' true, from a point on Government Island at latitude 45°35'10", longitude 122°32'41", to the southerly shore of Sand Island.
33 C.F.R. §110.128