This article offers an in-depth explanation of the Army Corps of Engineers' plan to build a large system of sewer tunnels and new reservoirs in Chicago and restore the separation between Lake Michigan and the Mississippi River. The project, estimated to cost more than $15 billion, has drawn scrutiny because it doesn't necessarily stop the invasion of Asian carp and other unwanted species into the Great Lakes. Meanwhile, the Great Lakes Commission proposed an alternative separation plan that costs $4.25 billion, with the addition of cargo transfer stations for existing barge traffic.

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