Maps. Plan and profile of Columbia River, Priest Rapids to Rock Island Dam, Crab Creek to mile 23, Washington dam site, topography by H. L. Pumphrey, W. R. Calvert, Arthur Johnson, H. B. Walker, F. A. Johnson, and Reclamation Bureau, surveyed in 1938, 1939, 1944 and 1945. Scale 1 m.=2.6 in., or 1 m.=13.2 in., scale 1:24,000 or 1:4,800, contour Interval on land 10 ft. or 5 ft., on river surface 1 ft. n. p.