The North Pacific Coast

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The Chicago River is 156 miles long. The river is noted for being the reason why Chicago became such an important city as a result of its location (it serves as the connection between the Great Lakes and the waterways in the Mississippi Valley).  The river is forever acknowledged by two horizontal blue stripes that are depicted on Municipal Flag of Chicago.

The Chicago River also serves as inspiration for one of Chicago's widespread symbols: a three-branched symbol in the shape of the letter “Y”. This symbol is found on many buildings throughout Chicago; it represents the 3 branches of the Chicago River.

 http://encyclopedia.chicagohistory.org/pages/263.html

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