Columbia River Between Mouth of Willamette River and Vancouver, Washington. Letter from the Secretary of the Army Transmitting a Letter from the Chief of Engineers, Department of the Army, Dated March 31, 1961, Submitting a Report, Together with Accompanying Papers and Illustrations, on an Interim Report on Columbia River Between Mouth of Willamette River and Vancouver, Washington, Requested by Resolutions of the Committees on Public Works, United States Senate and House of Representatives, Adopted March 14, 1957 and April 9, 1957