mhblev.boc 09/15/98 12:20:18 Lakes Michigan-Huron Beginning-of-Month Lake Levels YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN 1900 577.92 577.71 577.83 577.72 577.99 578.12 578.21 578.50 578.55 578.49 578.42 578.30 578.15 1901 577.94 577.76 577.64 578.00 578.23 578.45 578.59 578.80 578.74 578.37 578.19 577.81 578.21 1902 577.69 577.46 577.37 577.57 577.76 578.05 578.38 578.73 578.50 578.33 577.97 577.89 577.97 1903 577.58 577.52 577.60 577.93 578.14 578.44 578.58 578.67 578.68 578.74 578.52 578.17 578.21 1904 577.95 577.83 577.86 578.27 578.71 579.22 579.38 579.39 579.25 579.11 578.89 578.51 578.70 1905 578.19 577.98 577.94 578.24 578.39 578.86 579.22 579.36 579.29 579.11 578.75 578.59 578.66 1906 578.37 578.52 578.55 578.61 578.87 579.09 579.29 579.27 579.02 578.83 578.57 578.48 578.79 1907 578.32 578.42 578.36 578.51 578.72 579.02 579.25 579.31 579.17 579.08 578.76 578.51 578.78 1908 578.36 578.15 578.20 578.41 578.76 579.32 579.46 579.62 579.27 578.91 578.49 578.05 578.75 1909 577.76 577.66 577.66 577.67 578.20 578.68 578.86 578.85 578.67 578.46 577.96 577.87 578.19 1910 577.84 577.79 577.70 577.81 578.18 578.34 578.38 578.27 578.15 578.00 577.76 577.52 577.98 1911 577.13 577.09 577.04 577.03 577.32 577.68 577.79 577.66 577.54 577.50 577.46 577.41 577.39 1912 577.36 577.25 577.23 577.18 577.57 578.37 578.48 578.61 578.70 578.70 578.50 578.44 578.03 1913 578.23 578.14 578.03 578.33 578.92 579.31 579.41 579.43 579.25 578.95 578.75 578.69 578.79 1914 578.33 578.26 578.18 578.24 578.40 578.67 578.97 578.99 578.88 578.65 578.38 578.01 578.50 1915 577.67 577.63 577.68 577.57 577.60 577.77 577.98 578.11 578.10 578.14 577.77 577.73 577.81 1916 577.53 577.65 577.66 577.86 578.50 579.08 579.56 579.64 579.40 579.21 579.06 578.86 578.67 1917 578.85 578.72 578.60 578.77 579.15 579.42 579.97 580.20 579.96 579.67 579.31 579.09 579.31 1918 578.79 578.74 578.87 579.16 579.35 579.83 579.82 579.80 579.60 579.25 579.08 578.97 579.27 1919 579.00 578.84 578.73 579.03 579.39 579.79 579.73 579.65 579.33 579.07 578.93 578.70 579.18 1920 578.50 578.23 578.14 578.53 578.91 579.00 579.23 579.28 579.18 579.05 578.74 578.42 578.77 1921 578.26 578.20 578.04 578.31 578.83 578.89 578.92 578.76 578.64 578.48 578.18 577.90 578.45 1922 577.89 577.64 577.73 577.92 578.59 578.86 579.01 579.15 578.84 578.63 578.13 577.89 578.36 1923 577.54 577.31 577.18 577.32 577.70 578.06 578.21 578.15 577.98 577.86 577.60 577.23 577.68 1924 577.06 576.83 576.84 577.01 577.26 577.62 577.78 577.87 577.99 577.76 577.31 577.01 577.36 1925 576.62 576.41 576.39 576.55 576.62 576.53 576.69 576.70 576.41 576.16 575.87 575.69 576.39 1926 575.51 575.40 575.38 575.46 575.85 576.15 576.49 576.53 576.49 576.44 576.38 576.53 576.05 1927 576.45 576.40 576.44 576.71 576.97 577.48 577.69 577.86 577.63 577.57 577.39 577.37 577.16 1928 577.27 577.22 577.24 577.42 578.02 578.34 578.69 578.89 578.94 578.82 579.01 579.02 578.24 1929 578.94 578.99 578.87 579.30 580.02 580.62 580.77 580.70 580.44 580.04 579.72 579.40 579.82 1930 579.04 578.98 579.11 579.17 579.32 579.55 579.77 579.79 579.46 579.04 578.61 578.24 579.17 1931 577.94 577.66 577.44 577.44 577.45 577.59 577.68 577.57 577.22 577.31 577.01 577.09 577.45 1932 576.76 577.02 576.98 576.88 577.03 577.30 577.33 577.35 577.25 576.93 576.76 576.50 577.01 1933 576.48 576.40 576.37 576.33 576.86 577.39 577.51 577.45 577.12 576.86 576.60 576.36 576.81 1934 576.24 576.22 576.00 576.06 576.42 576.52 576.66 576.56 576.29 576.39 576.11 576.20 576.31 1935 576.13 576.03 576.09 576.29 576.44 576.54 576.89 576.99 576.88 576.73 576.44 576.43 576.49 1936 576.15 576.16 576.17 576.34 576.54 576.89 576.97 576.93 576.91 576.90 576.73 576.35 576.59 1937 576.26 576.27 576.34 576.22 576.69 576.95 577.12 577.14 577.09 576.92 576.71 576.58 576.69 1938 576.31 576.40 576.67 577.12 577.44 577.74 578.02 578.09 578.08 577.94 577.60 577.34 577.40 1939 577.17 577.06 577.13 577.17 577.58 577.90 578.27 578.29 578.30 578.04 577.73 577.44 577.67 1940 577.17 576.92 576.79 576.65 576.83 577.21 577.55 577.63 577.70 577.58 577.25 577.15 577.20 1941 577.09 577.03 576.92 576.76 577.12 577.25 577.28 577.25 577.01 577.07 577.27 577.33 577.12 1942 577.21 577.13 577.05 577.40 577.63 578.09 578.39 578.39 578.13 578.02 577.84 577.73 577.75 1943 577.63 577.59 577.69 577.98 578.30 578.84 579.45 579.60 579.54 579.22 578.88 578.74 578.62 1944 578.32 578.17 578.08 578.14 578.26 578.49 578.79 578.78 578.55 578.52 578.18 577.99 578.36 1945 577.69 577.51 577.45 577.70 577.97 578.46 578.90 578.96 578.81 578.74 578.56 578.45 578.27 1946 578.24 578.26 578.27 578.61 578.66 578.84 579.02 578.89 578.60 578.33 578.02 577.71 578.46 1947 577.52 577.43 577.34 577.33 578.03 578.64 579.01 579.15 579.03 578.87 578.65 578.36 578.28 1948 577.92 577.72 577.69 578.06 578.41 578.67 578.76 578.70 578.42 578.01 577.47 577.49 578.11 1949 577.21 577.21 577.20 577.16 577.40 577.51 577.78 577.84 577.53 577.21 576.91 576.60 577.30 1950 576.45 576.64 576.68 576.90 577.42 577.67 578.00 578.20 578.17 578.05 577.83 577.63 577.47 1951 577.53 577.59 577.71 578.00 578.80 579.04 579.27 579.58 579.57 579.39 579.46 579.42 578.78 1952 579.35 579.50 579.46 579.62 580.15 580.36 580.49 580.70 580.67 580.30 579.61 579.43 579.97 1953 579.24 579.10 579.07 579.28 579.55 579.77 580.03 580.04 579.97 579.59 579.23 578.84 579.47 1954 578.53 578.28 578.33 578.44 578.91 579.18 579.62 579.64 579.46 579.35 579.59 579.38 579.06 1955 579.12 578.95 578.83 578.87 579.26 579.37 579.39 579.22 578.90 578.39 578.24 577.97 578.88 1956 577.69 577.55 577.47 577.55 577.84 578.30 578.45 578.57 578.61 578.24 577.91 577.63 577.98 1957 577.42 577.18 577.09 577.09 577.36 577.67 577.95 578.12 577.87 577.68 577.44 577.32 577.52 1958 577.28 577.16 577.00 576.93 577.02 576.92 577.00 577.07 576.92 576.80 576.52 576.22 576.90 1959 575.94 575.84 575.85 576.05 576.65 576.99 577.02 577.01 577.17 577.06 577.05 577.06 576.64 1960 577.08 577.12 577.15 577.07 577.71 578.52 578.86 579.03 578.96 578.69 578.27 578.15 578.05 1961 577.72 577.43 577.38 577.51 577.73 577.82 578.00 578.04 577.93 577.95 577.73 577.51 577.73 1962 577.23 577.15 577.13 577.25 577.48 577.71 577.78 577.69 577.58 577.34 577.06 576.70 577.34 1963 576.35 576.12 576.04 576.27 576.51 576.75 576.77 576.80 576.72 576.51 576.23 575.95 576.42 1964 575.59 575.46 575.27 575.26 575.56 575.82 575.87 575.94 575.83 575.77 575.45 575.31 575.59 1965 575.15 575.13 575.18 575.32 575.89 576.26 576.34 576.35 576.42 576.69 576.61 576.60 576.00 1966 576.68 576.60 576.63 576.96 577.18 577.34 577.49 577.41 577.26 576.93 576.62 576.73 576.99 1967 576.82 576.86 576.82 576.95 577.63 577.80 578.28 578.24 578.11 577.85 577.71 577.64 577.56 1968 577.70 577.56 577.53 577.55 577.84 578.04 578.39 578.48 578.58 578.60 578.30 578.12 578.06 1969 578.06 578.06 578.03 578.05 578.49 578.94 579.42 579.64 579.44 579.03 578.88 578.73 578.73 1970 578.45 578.31 578.17 578.17 578.51 578.89 579.14 579.37 579.10 579.22 578.98 578.81 578.76 1971 578.76 578.63 578.70 578.91 579.32 579.55 579.70 579.75 579.62 579.40 579.17 578.87 579.20 1972 578.96 578.70 578.65 578.75 579.22 579.57 579.72 579.88 580.11 580.05 579.84 579.66 579.43 1973 579.65 579.68 579.61 580.06 580.40 580.93 581.19 581.12 581.09 580.68 580.43 580.10 580.41 1974 579.89 579.94 579.89 580.00 580.46 580.78 581.05 581.07 580.88 580.56 580.20 579.98 580.39 1975 579.76 579.63 579.72 579.83 580.13 580.42 580.63 580.53 580.42 580.13 579.64 579.52 580.03 1976 579.39 579.18 579.33 579.93 580.30 580.60 580.64 580.54 580.14 579.65 579.13 578.78 579.80 1977 578.28 577.91 577.96 578.35 578.60 578.54 578.55 578.52 578.55 578.57 578.30 578.33 578.37 1978 578.34 578.28 578.15 578.15 578.53 578.87 578.97 578.99 578.97 579.00 578.77 578.53 578.63 1979 578.27 578.20 578.11 578.65 579.27 579.66 579.92 579.90 580.05 579.63 579.42 579.37 579.20 1980 579.25 579.18 579.05 579.01 579.47 579.61 579.81 579.80 579.78 579.54 579.24 578.94 579.39 1981 578.68 578.49 578.64 578.64 579.09 579.24 579.44 579.38 579.38 579.15 579.00 578.79 578.99 1982 578.46 578.38 578.18 578.41 578.80 579.01 579.14 579.24 579.12 579.01 578.85 578.90 578.79 1983 579.12 579.04 579.03 579.20 579.52 580.17 580.30 580.19 580.03 579.78 579.55 579.40 579.61 1984 579.22 579.06 579.19 579.27 579.59 579.89 580.15 580.16 580.03 579.86 579.74 579.64 579.65 1985 579.68 579.57 579.71 580.20 580.78 581.02 580.99 580.93 580.88 580.78 580.61 580.70 580.49 1986 580.53 580.39 580.30 580.58 580.83 581.01 581.23 581.43 581.16 581.63 581.54 581.07 580.97 1987 580.74 580.43 580.23 580.20 580.24 580.24 580.20 579.98 579.86 579.62 579.16 578.96 579.99 1988 578.94 578.75 578.63 578.64 579.00 578.97 578.79 578.62 578.37 578.17 577.96 578.21 578.59 1989 578.04 577.94 577.74 577.95 578.16 578.39 578.70 578.61 578.43 578.05 577.77 577.59 578.11 Mean 577.87 577.78 577.75 577.90 578.25 578.55 578.74 578.78 578.65 578.47 578.22 578.05 578.25 StDv 1.11 1.10 1.10 1.14 1.16 1.18 1.19 1.19 1.18 1.14 1.14 1.11 1.11 Max 580.74 580.43 580.30 580.58 580.83 581.02 581.23 581.43 581.16 581.63 581.54 581.07 580.97 Min 575.15 575.13 575.18 575.26 575.56 575.82 575.87 575.94 575.83 575.77 575.45 575.31 575.59