Flow Direction
A principal feature of the Chicago Portage water gap is that water can flow through it in either direction across the continental divide. It has flowed from east to west, west to east, or not at all. There have been two long-term reversals, and short-term reversals still happen today. Initially, water flowed from east to west starting about 10,000 years ago. About 3,000 years ago, this flow mostly stopped, and the Chicago Portage became a wind gap, except during floods when it flowed from west to east. In the year 1900, it was reversed to again flow continuously from east to west, except during floods when it can be reversed to flow from west to east.
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Famous quotes containing the words flow and/or direction:
“The current of our thoughts made as sudden bends as the river, which was continually opening new prospects to the east or south, but we are aware that rivers flow most rapidly and shallowest at these points.”
—Henry David Thoreau (1817–1862)
“Your Englishman, confronted by something abnormal will always pretend that it isn’t there. If he can’t pretend that, he will look through the object, or round it, or above it or below it, or in any direction except into it. If, however, you force him to look into it, he will at once pretend that he sees the object not for what it is but for something that he would like it to be.”
—James Agate (1877–1947)