Relief shown by contours and spot heights, depths shown by isolines and soundings.
"Contour interval 20 feet."
"Topography by photogrammetric methods from aerial photographs taken 1954. Field checked 1960-61. Selected hydrographic data compiled from U.S. Lake Survey charts 702 and 703 (1960)."
Horizontal datum name: 1927 North American datum.
10,000-foot grid based on Wisconsin coordinate system, central zone and Michigan coordinate system, west zone ; 1000-meter Universal Transverse Mercator grid ticks, zone 16.