Notes: | Relief shown by isolines and soundings. "Contour" interval 5 fathoms (30 feet). "Preparation of this chart is based on the sounding data of the National Oceanographic and Atmospheric Administration Lake Survey Chart no. 14900/75." "Plane of reference of this chart (low water datum) ... 576.8 ft. "This chart is absolutely not to be used in navigation." Includes table of morphometric parameters; graphs of hypsographic curves, Lake Michigan-Huron monthly and yearly mean water levels, and population growth as compared to water quality parameters; and inset maps of Lake Michigan drainage basin, sounding line spacing, and currents.
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