Chicago canal electric barrier (2002)
The Army Corps built an electric fish barrier on the Chicago Sanitary and Ship Canal, the first attempt to keep Asian carp from passing from the Mississippi River basin into Lake Michigan.
The barrier slowed but did not stop the carp, which continued advancing up the Illinois River.
It showed a single point of defense can be overwhelmed, prompting the need for the layered Brandon Road system.
Brandon Road is the next, more comprehensive line of defense against the same advance.
