Table 11. Summary of bluff rece 



ssion rates reported in various sources. 



Location Time 



Average 



Recession 



interval 



lake level 

 (m) 



rate 



(m/yr) 



Powers (1958) | 



Berrien County 



1830-1956 



1 



0.60 



Lake Michigan (all) 



1830-1956 





0.45 



Beach Erosion Board (1956) | 



Reach A 



1830-1954 



1 



0.44 



Reach B 



1830-1954 





0.25 



Reach C^ 



1830-1954 





0.05 



Reach D^ 



1830-1954 





1.28 



Peak 



1830-1872 





3.21 



Reach E^ 



1830- 19S4 





0.49 



Avg. (all reaches) 



1830-1954 





0.50 



Seibel (1972) | 



Bridgeman, Mich. 



1938-70 



176.11 



1.17 





1938-50 



176.08 



0.7S 





1950-55 



176.49 



1.48 





1955-60 



176.05 



1.41 





1960-67 



175.88 



0.73 





1967-70 



176.30 



2.78 



Near nuclear powerplant 



1967-70 



176.30 



1.95 





1970-72 



176.54 



2.78 



^achigan Department of Natural Resources (1974; 1975) | 



Reaches A, B, and C (1975) 



1938-74 



176.25 



1.1 



Reaches D and E (1975) 



1938-74 



176.25 



0.5 



Near nuclear powerplant (1974) 



1970-74 



176.71 



3.86 



Peak 



1970-74 





7.0 



Minimum 



1970-74 





0.8 



Tanner (1975) | 



Near nuclear powerplant 



1927-56 



176.15 



0.64 





1956-64 



175.95 



2.5 





1964-70 



176.05 



4.2 





1970-73 



176.67 



3.9 



^Insufficient data; no lake level da'ta collected between 1830 and 1860. 

 ^Actual stations near but not in these reaches. 





1 r- -f ' f-—~^ 1 1 1 r r 1 — ■ 



177.0 



ir\ A, /\ This Study IS 



176 5 



-^^ V^rAvA h /-n/\ f^ - 



176.0 



W j^ \l\/ - 



175.5 



^ V V - 





1830 















Seibe 



(1972) B^ 



a 





Michigon Deportment of Noturol Resources (197 



Tanner (1975) 

 1 1 1 1 1 1 1 . 



4,19/5) ■■""■■ "■"" ^ 





1 1 1 1 Ei 



582 



581 



580 



579, 



578 ~ 



577 



576 



575 



I860 1870 1880 1890 1900 1910 1920 1930 1940 1950 I960 1970 1980 



Yeor 



Figure 34. Periods of previous study and historic lake level variations. 



53 



