Connecting the Great Lakes and Mississippi watersheds through the Chicago Area Waterway System (CAWS) has been a boon to industry and commerce, and it supports transportation and recreation. But opening a pathway between bodies of fresh water has a price.
Within CAWS, the price is an invasive species of Asian carp.
Five states — Michigan, Wisconsin, Ohio, Minnesota and Pennsylvania — sued the Army Corps of Engineers (the Corps) and the Metropolitan Water Reclamation District of Greater Chicago (the District) in federal court, seeking a preliminary injunction that would require the defendants to put in place additional physical barriers throughout the CAWS, implement new procedures to stop invasive carp, and expedite a study of how best to separate the Mississippi and Great Lakes watersheds permanently.






