Rain cause of Chicago River's two-toned color, officials say

Posted11/6/2017 2:22 PM

It's the strange case of the Chicago River's clashing color line.

Two distinct colors of water have been spotted at Wolf Point since Friday -- separated by a prominent demarcation line -- and still refused to mingle on Monday.

The normally dark, muddy color of the north and south branches of the river stand in stark comparison to the vibrant teal more reminiscent of the green hue pumped in for the city's annual St. Patrick's Day river dyeing, or the waters of Canada's Lake Louise.

The reason for the oil-and-vinegar effect, according to folks from two government agencies who monitor the waterway, can be traced back to rainwater that fell several days last week.

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