US Army Corps of Engineers
Chicago District Website


USACE works with other agencies to aggressively monitor the Chicago Area Waterway System and Illinois Waterway to characterize downstream Asian carp populations, to monitor for the presence of Asian carp above the electric barriers and also to analyze the effectiveness of the electric barriers.

Traditional monitoring methods include electro-fishing, netting and ultrasonic telemetry. Telemetry tracks tagged fish through receivers placed underwater to document movement and response to the barriers.


Individually-coded transmitters have been surgically implanted into more than 674 fish of all sizes in the Chicago Area Waterway System, resulting in over 29.1 million detections. Since 2011, two transmitters implanted into Common Carp downstream of the barriers have been located upstream, although no detections were observed at barrier receivers. The most plausible explanation is assisted passage via barge entrainment; both transmitters were either expelled or the fish had expired.

Only one Bighead Carp in Lake Calumet in 2010, and one Silver Carp in the Little Calumet River in 2017, have been collected above the electric barriers.

To view the 2019 ACRCC Monitoring and Rapid Response Plan for Asian Carp in the Upper Illinois River and Chicago Area Waterway System or the  Asian carp weekly sampling summary visit the ACRCC website at


For more information on telemetry, please send an e-mail to

For more information on electrofishing, please send an e-mail to