(2) All of the lands, together with the accretions thereto lying westerly of the east line of section 7, township 8 north, range 10 west, Willamette Meridian, Clatsop County, State of Oregon, extending northerly to the main channel of the Columbia River as it existed on May 19, 1967; bounded on the south by the south line of said section 7 extended westerly to the low water of the Pacific Ocean; and bounded on the north by the main channel of said Columbia River extended downstream to the Pacific Ocean. [1967 c.288 §§1,2]