USACE indicated in a release that here are two other electric barriers in the CSSC. The barriers are operated to deter the inter-basin establishment of Asian carp and other fish through an electric field in the water via the CSSC. The barriers are one control technology in a broad interagency effort to protect the Great Lakes from Asian carp establishment.
USACE said that laboratory and tagged-fish results show that the electric barriers are an effective fish deterrent. As of spring 2013, individually-coded transmitters have been surgically implanted into approximately 238 fish of all sizes in the Chicago Area Waterway System. There have been nearly 6 million detections of these fish, and no tagged fish have crossed the barriers in the upstream direction. No Asian carp have been captured or observed above the barriers in the last two years. Currently, the adult population front of Asian carp is about 55 miles from Lake Michigan and has not moved for several years. The electric barriers are approximately 37 miles from Lake Michigan.