COLUMBIA RIVER CHANNEL, WASHINGTON AND OREGON.

SEC. 359. COLUMBIA RIVER CHANNEL, WASHINGTON AND OREGON. (a) In General.—The project for navigation, Columbia River between Vancouver, Washington, and The Dalles, Oregon, authorized by the first section of the Act of July 24, 1946 (60 Stat. 637, chapter 595), is modified to authorize the Secretary to construct an alternate barge channel to traverse the high span of the Interstate Route 5 bridge between Portland, Oregon, and Vancouver, Washington, to a depth of 17 feet, with a width of approximately 200 feet through the high span of the bridge and a width of approximately 300 feet upstream of the bridge. (b) Distance Upstream.—The channel shall continue upstream of the bridge approximately 2,500 feet to about river mile 107, then to a point of convergence with the main barge channel at about river mile 108. (c) Distance Downstream.— (1) Southern edge.—The southern edge of the channel shall continue downstream of the bridge approximately 1,500 feet to river mile 106+10, then turn northwest to tie into the edge of the Upper Vancouver Turning Basin. (2) Northern edge.—The northern edge of the channel shall continue downstream of the bridge to the Upper Vancouver Turning Basin.