Great Lakes carp barrier begins in-water testing near Chicago
Built WorldThe first permanent piece of a $1.15 billion system meant to stop invasive carp reaches the water at Brandon Road
July 13th, 2026: In-water testing begins on first permanent barrierNew here? Follow stories to track developments over time. Create a free account to get updates when stories you care about change.
Overview
Updated Jul 13For more than a century, an artificial canal has linked the Mississippi River to Lake Michigan. That link is how invasive carp could reach the Great Lakes. This week, crews lowered the first permanent piece of a barrier built to close that door.
The US Coast Guard shut a stretch of the Chicago Sanitary and Ship Canal from July 13 to July 17 so the Army Corps of Engineers could test the component in the water. It is the first hardware milestone in a $1.15 billion system near Joliet, Illinois, aimed at protecting a roughly $7 billion Great Lakes fishery.
Why it matters
If invasive carp reach the Great Lakes, they could gut a $7 billion fishery and reorder the food web for five US states and Ontario.
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People Involved
Organizations Involved
The federal agency designing and building the Brandon Road barrier system.
The agency that closed the canal to traffic so testing could proceed safely.
Timeline
December 2022 July 2026
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In-water testing begins on first permanent barrier
Latest MilestoneThe Corps starts testing the first permanent barrier component in the canal during a five-day closure near Joliet, Illinois.
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Coast Guard sets the testing safety zone
RegulatoryThe Coast Guard publishes the rule closing part of the canal from July 13 to July 17 for in-water testing.
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First contract completed
ConstructionCrews finish the initial site-prep and rock-removal contract, clearing the way for the engineered channel work.
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First construction contract awarded
ConstructionThe Corps awards a $15.5 million contract for site preparation and riverbed rock removal, marking the start of physical work.
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Illinois and Michigan sign the partnership agreement
AgreementThe two states and the Army Corps sign the deal that unlocks construction funding and sets the 90/10 federal-state split.
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Funding agreement stalls
DelayNegotiations over cost, land rights and permitting delay the partnership agreement through most of 2023, pushing back the timeline.
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Federal law raises the federal cost share to 90%
LegislationThe Water Resources Development Act of 2022 shifts most of the project's cost onto the federal government, easing the burden on Illinois and Michigan.
Historical Context
3 moments from history that rhyme with this story — and how they unfolded.
Chicago Sanitary and Ship Canal opens (1900)
Engineers reversed the Chicago River and opened the Sanitary and Ship Canal to carry sewage away from Lake Michigan. The canal cut an artificial link between the Mississippi and Great Lakes basins that nature never made.
The reversal solved Chicago's drinking-water contamination problem and boosted shipping.
It created a permanent aquatic highway between two basins, the exact path invasive carp now use to approach Lake Michigan.
The Brandon Road barrier exists to plug the hole this canal opened more than a century ago.
Electric dispersal barrier goes live (2002)
The Army Corps switched on an experimental electric barrier in the canal to shock fish and block carp movement. It was the first line of defense and remains in operation.
The barrier deterred fish passage but was never designed as a permanent, standalone solution.
Carp DNA and fish were later detected upstream, showing a single electric barrier was not enough.
Brandon Road layers sound, bubbles and a flushing lock on top of electricity because one method proved insufficient.
Sea lamprey invade the upper Great Lakes (1930s–1950s)
Sea lampreys spread through shipping canals into the upper Great Lakes and attached to native fish, collapsing the lake trout catch. The lake trout harvest fell from millions of pounds a year to near zero.
Commercial fisheries in Lakes Huron and Michigan crashed within two decades.
The US and Canada built a lasting control program that still spends tens of millions a year to hold lampreys down.
It shows how one invasive species through a canal can wreck a fishery, and why officials treat carp as an existential threat.
