Lake Borgne Surge Barrier

Lake Borgne Surge Barrier
Name	Lake Borgne Surge Barrier
Location	St. Bernard Parish, Orleans Parish, Louisiana, United States
Coordinates	29.88°N 89.80°W
Status	Operational
Construction	2009–2013
Cost	~$1.1 billion
Owner	United States Army Corps of Engineers
Length	1.8 miles (approx.)
Type	Surge barrier, floodwall, gate complex

Lake Borgne Surge Barrier The Lake Borgne Surge Barrier is a coastal storm surge protection project situated near New Orleans, St. Bernard Parish, Louisiana, and Plaquemines Parish, Louisiana, designed to reduce hurricane-driven flooding linked to the Hurricane Katrina disaster and subsequent federal initiatives. Built as part of the broader Hurricane and Storm Damage Risk Reduction System (HSDRRS) overseen by the United States Army Corps of Engineers, the barrier integrates with regional projects such as the Inner Harbor Navigation Canal Lock and the Mississippi River Gulf Outlet closure to protect urban, industrial, and port assets including Port of New Orleans and Louisiana Offshore Oil Port facilities.

Overview

The project was authorized under the Water Resources Development Act of 2007 and funded through congressional appropriations influenced by post‑Katrina responses including the Stafford Act implementation and rebuilding programs managed alongside agencies like the Federal Emergency Management Agency and the Department of Homeland Security. Located at the eastern approach to Lake Pontchartrain and the mouth of the Mississippi River Delta, the barrier addresses storm surge pathways identified after the 2005 Atlantic hurricane season and coordinates with navigation interests including the Intracoastal Waterway and shipping operations tied to the Port of South Louisiana and Louisiana Ports Association.

Design and Construction

Engineered by the United States Army Corps of Engineers New Orleans District with contractors including several large firms under federal procurement, the barrier consists of a concrete-embedded earthen levee, pile-supported segments, and a movable gate complex incorporating sector gates similar in concept to gates at the Industrial Canal and locks such as the Inner Harbor Navigation Canal Lock. Construction involved geotechnical work referencing methods from projects like the Thames Barrier and MOSE Project, dredging tied to operations of the U.S. Army Corps of Engineers Mississippi Valley Division, and coastal engineering practices practiced by institutions such as Louisiana State University and Tulane University research teams. Major components include concrete cells, steel sheet piling, rock riprap, and mechanical gate housings designed to withstand surge modeled by agencies including the National Oceanic and Atmospheric Administration and the National Hurricane Center. The schedule ran from initial groundbreaking in 2009 to substantial completion in 2013, with coordination involving the Federal Highway Administration when access infrastructure and haul routes impacted state routes and parish roadways.

Operation and Flood Risk Reduction

Operational control of the gate complex is vested in the United States Army Corps of Engineers with protocols developed in consultation with National Weather Service forecasts, Gulf Coast Hurricane Preparedness plans, and local emergency managers in New Orleans Office of Homeland Security and Emergency Preparedness. The barrier is intended to reduce return-period flooding for scenarios comparable to or exceeding Hurricane Isaac (2012), using deterministic and probabilistic surge models like those developed by NOAA and the USACE HEC-RAS framework. Integration with the HSDRRS, including improvements to the New Orleans Hurricane and Storm Damage Risk Reduction System, aims to lower flood risk to residential neighborhoods, industrial complexes such as ExxonMobil Refinery facilities, and critical infrastructure including Louis Armstrong New Orleans International Airport access corridors.

Environmental and Ecological Impacts

Environmental assessments prepared under the National Environmental Policy Act and consultations with the U.S. Fish and Wildlife Service evaluated impacts to habitats including marshes of Louisiana, wetlands, and nursery grounds for species managed by the National Marine Fisheries Service. Concerns cited by Environmental Defense Fund, Louisiana Environmental Action Network, and academic researchers at University of Louisiana at Lafayette included alterations to salinity regimes affecting oyster beds associated with the Gulf of Mexico fisheries, changes to sediment transport implicated in coastal land loss in Louisiana, and potential effects on protected species under statutes like the Endangered Species Act. Mitigation measures referenced include habitat restoration projects coordinated with entities such as the Coastal Protection and Restoration Authority of Louisiana and compensatory wetland creation financed through federal and state programs.

Maintenance, Monitoring, and Performance

Post-construction monitoring programs run by the USACE New Orleans District and research partners at Louisiana State University Coast & Environment track structural integrity, gate mechanics, corrosion rates, and geotechnical settlement using instrumentation methods common to projects overseen by the American Society of Civil Engineers (ASCE). Performance evaluations after events like Hurricane Isaac (2012) and later tropical storms have informed maintenance cycles, emergency operation plans, and interoperability with regional pumps, canals, and drainage systems managed by local entities such as the Southeast Louisiana Flood Protection Authority and Orleans Levee District. Funding for ongoing maintenance has been sourced through federal appropriations and state coordination with the Louisiana Legislature.

Controversies and Community Response

Community advocacy groups including Common Ground Relief, Lower Ninth Ward Homeownership Association, and environmental organizations raised concerns about equity, long-term ecosystem tradeoffs, and the prioritization of industrial protections over neighborhood resiliency, echoing broader debates seen after Hurricane Katrina and in planning fora such as hearings before the United States Congress and state commissions. Legal challenges and public comment periods under the National Environmental Policy Act process brought issues such as cultural resource impacts involving stakeholders like the African American Heritage Society and local parish governments into dispute resolution. Ongoing dialogues continue among federal agencies, state authorities, parish officials, and civic organizations to reconcile flood protection objectives with restoration goals championed by groups like the National Audubon Society and the Nature Conservancy.

Category:Flood barriers in the United States Category:Buildings and structures in Louisiana