Scale 1:48,000 ; Relief shown by contours and spot heights ; "Topography of valleys and reservoir sites from surveys by the U.S. Reclamation Service in 1905, contour interval 1 to 10 feet. Topography of uplands from surveys by the U.S. Geological Survey, contour interval 50 feet." ; Includes diagram of 1905 surveyed areas, and an index map