Box 22, Folder 11: Water Levels-Various Data, 1865-1873

City Bench Marks-

[Table of Bench marks]

Datum established by ordinance-"Level of the Milwaukee river as it was in the month of March 1836"-

Water table of my house 325 Poplar street- 12.33-This bench used in setting the Lake survey tide gauge &c-

In June 1875 these marks compared by T.W. Wright, asst. engr. Lake Survey.-

High water of 1838 was above this zero 4.00 feet Lake Survey zero (1 foot higher) being 5.00 "

Chicago City zero 0.55 lower than Milwaukee.

Gay Agt In. Cont' Canal to Indianapolis "Stantons Tables"

[calculations].