WHOLE VOL. 



LAKE AND RIVER LEVELS 



621 



NORTH AMERICA 



LAKE MICHIGAN, UNITED STATES 



Monthly means of water levels at Milwaukee, Wis., 



above mean tide at New York, N. Y* 



500 ft. + 



Authority, United States Lake Survey. Data supplied by Sydney M. Wood, C. E., Lake Bluff, 111. 



