THE PEESENT BEACH OF LAKE MICHIGAN. 



457 



From the above table it appears that the average erosion in the portion 

 of the shore between Milwaukee and Manitowoc is 4.33 feet a year, while 

 between Milwaukee and Evanston it is 6.24 feet a year. The average 

 erosion of the two sections is 5.28 feet. 



A series of more careful measurements than those given in the above 



table appears in the Geology of AVisconsin and covers part of this section 



of the shore. The following is the statement furnished by Dr. Lapham to 



Professor Chamberlin : ' 



Mr. S. G. Knight, of Eacine, has carefully measured for the Geological Survey 

 the distance from the nearest section corner or quarter post to the bauk of Lake 

 Michigan along all the section lines in Eacine County, the results of which, compared 

 with the Government survey made in 1S36, are given in the following table. Had 

 these measurements been made at right angles to the shore line, the result would have 

 been a trifle less; but as some portions of the bank have been artificially protected, 

 we may assume the result as a close approximation to the actual amount of loss during 

 the past thirty-eight years in Eacine County. These measurements will have their 

 value mauy years hence. 



Erosion of the lake shore iii Racine County, Wisconsin. 



Section lines. 



North line, sec. 6, T. 4, R. 23 



North line, sec. 7, T. 4, E. 23 



West line, sec. 8, T. 4, R. 23 



North line, sec. 17, T. 4, R. 23 



West line, sec. 16, T. 4, R. 23 



North line, sec. 21, T. 4, R. 23 



West line, sec. 22, T. 4, R. 23 



North line, sec. 27, T. 4, R. 23 



North line, sec. 34, T. 4, R. 23 



West line, sec 34, T. 4, R. 23 



North line, sec. 4, T. 3, R. 23 



North line, sec. 9, T. 3, R. 23 



North line, sec. 16, T. 3, R. 23 



North line, sec. 21, T. 3, R. 23 



North line, sec. 28, T. 3, R. 23 



West line, sec. 28, T. 3, R. 23 



North line, sec. 32, T. 3, R. 23 



South line, sec. 32, T. 3, R. 23 



Mean of eighteen places 



Same in feet, 126.72. 



Loss per annum in feet, 3.33. 



Chains. 

 32.70 

 34.68 

 30.18 

 16.38 

 10.86 

 15.58 

 19.39 

 26.3U 

 16.04 

 31.50 

 28.03 

 18.82 

 27. 80 

 21.25 

 32.22 

 30.20 

 34.85 

 46.60 



Chains. 

 30.30 

 33.45 

 29.70 

 14.60 

 9.75 

 14.50 

 18.43 

 26.39 

 15. 47 

 30.00 

 26.50 

 18.00 

 20.60 

 18.00 

 31.16 

 23.87 

 32.40 

 44.73 



Chains. 

 2.40 

 1.23 

 0.48 

 1.78 

 1.11 

 1.08 

 0.96 

 0.00 

 0.57 

 1.50 

 1.53 

 0.82 

 6.20 

 3.25 

 1.66 

 6.33 

 2.45 

 1.87 



1.92 



'Geology of Wisconsin, Vol. II, 1877, pp. 231, 232. 



