Originally the Chicago River was dyed to trace sewage that illegally contaminated the river (1962). Due to the bright green color, it was decided that it would be a festive event to celebrate St. Patrick's Day. Apparently there is some environmental impact. . . (only!) 40 pounds of dye is added to the river now, whereas in 1962 it was 100 pounds.
A link with some pictures and commentary of the river:
http://scienceblogs.com/insolence/2008/03/happy_st_patricks_day.php
More pictures and explanation:
http://www.pbase.com/tianphoto/chicago_river
Monday, March 16, 2009
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