Hayden (Oregon) Slough, Columbia River, Oreg. Letter from the Secretary of War, transmitting, with a letter from the Chief of Engineers, report on preliminary examination of Hayden Slough, Columbia River, near Portland, Oreg., with a view to the relocation of the Dike near upper end. April 16, 1918. -- Referred to the Committee on Rivers and Harbors and ordered to be printed