TRAVERSE CITY, Mich. | The debate over how to protect the Great Lakes from an Asian carp invasion is shifting to Congress now that the U.S. Army Corps of Engineers has presented options for blocking their path in Chicago waterways.
The Corps released a report Monday with eight potential approaches.
They range from doing nothing new to sealing off Lake Michigan from the carp-infested Mississippi River watershed with dams, which could cost more than $18 billion and take 25 years.
The agency is hosting seven public meetings this month to explain the report and get feedback.
Project manager Dave Wethington said Tuesday that the Corps will need authorization and funding from Congress to take further action.
Environmental groups say the only acceptable option is physically separating the two watersheds, which Chicago-area shipping interests oppose.