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Army Corps proposes alternatives to protect lakes

TRAVERSE CITY, Mich. (AP) - The U.S. Army Corps of Engineers has released a report years in the making about options for keeping Asian carp from invading the Great Lakes.

The report given to Congress on Monday focuses on the Chicago Area Waterway System. The system is a network of rivers and canals that provides a direct link between Lake Michigan and the Mississippi River.

The report offers eight plans for preventing Asian carp and other species from migrating between the Great Lakes and the Mississippi basin.

Some options involve placing physical barriers in the waterways to separate the watersheds. The report estimates that physical separation could cost as much as $18.4 billion and take 25 years to complete.

Other potential steps include use of locks, electric barriers and water treatment to remove invasive species.