Drought could reverse flow of Chicago River
Water levels on Lake Michigan are the lowest in recorded history. If the level continues to drop, the Chicago River could reverse itself and send untreated sewage into Lake Michigan.
"We’ve been monitoring since 1918 and this is the lowest Lake Michigan and Lake Huron have been,” Roy Deda, U.S. Army Corps of Engineers, said. “There would be some potential water quality impact to the Great Lakes if we were to continue to lock vessels when the river is higher than the lake.”
“Our river is 70-percent sewage. I think we need to recognize that. This is an open sewer. It depends upon gravity to go away from us. If that gravity does not work with the lake going down, it goes the other way, and we have done nothing to deal with the contaminants that we need to actually invest in fixing,” Henry Henderson, Natural Resources Defense Council
The Army Corps of Engineers said it is carefully monitoring the situation, and if lake levels continue to drop, they may have to modify how they operate the locks to limit the amount of water that goes into the lake, which would have an impact on recreational boats and barge traffic.