p. 264

276 Lake Michigan

is estimated at one thousand feet. The bottom is therefore about four hundred feet below the Ocean level. Its greatest width is opposite Milwaukee [and is estimated at about] where it is nearly one hundred miles.

The length of coast on [this] Lake Michigan as near as can at present be ascertained is as follows:

In Wisconsin from the state line of Illinois to the north point of Rock Island at the entrance of Green Bay (correct) 257 miles
In Michigan from Rock I. to the narrowest point of the straits of Mackana 159; thence to the south line of the state 462*
In Indiana 39
In Illinois 63
[Calculations]

To this should be added Green Bay which has a periphery in Wisconsin-200 miles
in Michigan 120
[Calculatios].

*The Grand Traverse Bay, included in this estimate has a coast line of one hundred and eleven miles; but it is only nine miles across its entrance into the Lake.