. The effect of structures and lake level on bluff and shore erosion in Berrien County, Michigan, 1970-74 . 1950 I I t I I I I 578 r I960 1965 Yeor 1970 Figure 2. Annual average of Lake Michigan water level as recorded at Ludington, Michigan, from 1951 to 1974 (IGLD). Figure 3 shows the mean monthly lake level from 1970 to 1974 and the maxi- mum and minimum mean daily water levels for each month. The average seasonal lake level variation from lows in the beginning of the year to highs in summer is meter which equals the long-term average given by Seibel (1972). A major increase in the ave

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. The effect of structures and lake level on bluff and shore erosion in Berrien County, Michigan, 1970-74 . 1950 I I t I I I I 578 r I960 1965 Yeor 1970 Figure 2. Annual average of Lake Michigan water level as recorded at Ludington, Michigan, from 1951 to 1974 (IGLD). Figure 3 shows the mean monthly lake level from 1970 to 1974 and the maxi- mum and minimum mean daily water levels for each month. The average seasonal lake level variation from lows in the beginning of the year to highs in summer is meter which equals the long-term average given by Seibel (1972). A major increase in the average lake level occurred in 1972 when there was little seasonal decrease in lake level following the summer peaks.

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