HAVANA, Ill. --The Army Corps of Engineers has released a report on preventing Asian carp from invading Lake Michigan.
They offer eight alternatives for preventing the Asian carp from entering the Great Lakes.
Most of them would require spending billions of dollars over the next two decades.
The cheapest plan is to keep an electric barrier near Chicago in place, and hope it keeps the carp out of the Great Lakes.
The most expensive plans call for physically cutting off Lake Michigan from the Illinois and Des Plaines Rivers.
That would cost over $18 billion and take 25 years to build.
Politicians who had hoped the Corps would come up with a definitive solution to the carp problem were disappointed in the report, which is being sent to Congress.