A U.S. Army Corps of Engineers study has identified eight plans, costing as much as $18.4 billion, to block Asian carp and other harmful species from moving from the Mississippi River basin through waterways around Chicago and into the Great Lakes.
The Corps’ Great Lakes and Mississippi River Interbasin Study, released on Jan. 6, holds out the possibility of hundreds of billions of dollars in design and construction work over many years, but it does not pick a preferred plan from among the eight options, nor does it rank the proposals in priority order.