from The Journal of Geography, Volume 12, 1913-14
I've seen similar cross section diagrams which display the different depths along the Fox River but this one, I think, dramatically illustrates why the lock system iis needed to safely navigate the river. In the 37 miles from Menasha to Green Bay, the Fox falls from 746 to a final 578 feet above sea level. One doesn't realize that the total drop of these falls (168 feet) is approximately the same as Niagara Falls, although over a much longer stretch, obviously.
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