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| Morganza Floodway | |
|---|---|
| Name | Morganza Floodway |
| Location | Pointe Coupee Parish, Louisiana |
| Coordinates | 30.6983°N 91.5541°W |
| Opened | 1954 |
| Owner | United States Army Corps of Engineers |
| Purpose | Flood control |
| Type | Spillway / floodway |
| Length | 22 miles |
| Capacity | up to 600,000 cubic feet per second (design) |
Morganza Floodway is a controlled floodway on the Mississippi River in Louisiana designed to relieve high river stages and protect downstream cities. Constructed and operated by the United States Army Corps of Engineers, it is one component of a system that includes the Bonnet Carré Spillway and the Old River Control Structure to manage flow between the Mississippi and adjacent basins. The floodway connects the Mississippi to the Atchafalaya Basin and thence to the Gulf of Mexico via the Atchafalaya River.
The floodway was authorized under post‑Great Mississippi Flood of 1927 reforms implemented by the Flood Control Act of 1928 and further informed by analyses from the Mississippi River Commission, the Interstate Commerce Commission (historically for navigation impacts), and the National Weather Service for hydrologic forecasting. It serves to reduce peak stages at critical downstream nodes including Baton Rouge, New Orleans, Plaquemines Parish, and St. Bernard Parish by diverting excess flow into the Atchafalaya Basin, protecting shipping channels maintained by the United States Army Corps of Engineers New Orleans District and preserving navigation interests of carriers such as Ingram Barge Company and Kirby Corporation.
Engineered in the mid‑20th century, the design incorporated earthen levees, concrete control structures, and gated openings modeled in consultation with the National Academy of Sciences and the American Society of Civil Engineers. Construction began under contracts awarded to regional firms and federal contractors overseen by the USACE New Orleans District, with significant civil works similar to projects like the Bonnet Carré Spillway and the Old River Control Structure. The floodway’s headworks include a series of fuse plugs and gated structures engineered to operate with river stages predicted by the National Oceanic and Atmospheric Administration and hydrograph analyses from the U.S. Geological Survey. Geotechnical studies referenced precedents such as the 1937 Ohio River flood controls and engineering standards promulgated by the American Concrete Institute.
Operational decisions are made by the United States Army Corps of Engineers based on forecasts from the National Weather Service, inflow data from the U.S. Geological Survey streamgages, and coordination with state authorities including the Governor of Louisiana office and the Louisiana Department of Transportation and Development. Activation follows protocols developed after consultations with the Mississippi River Commission and during major flood events requiring coordination with the Federal Emergency Management Agency and regional levee districts such as the Southeast Louisiana Flood Protection Authority. Management balances navigation considerations for companies like Cargill and Bunge Limited with flood risk reduction for municipalities governed by bodies such as the City of Baton Rouge and the City of New Orleans.
Diversion of Mississippi flows into the Atchafalaya Basin alters sediment transport, nutrient fluxes, and habitat dynamics affecting species monitored by the U.S. Fish and Wildlife Service, Louisiana Department of Wildlife and Fisheries, and academic researchers at institutions like Louisiana State University and Tulane University. Impacts include wetland accretion, changes in estuarine salinity influencing fisheries managed by the National Marine Fisheries Service, and effects on migratory bird populations tracked by the Audubon Society and U.S. Fish and Wildlife Service refuges. Environmental assessments conducted in coordination with the Environmental Protection Agency consider implications for threatened species listed under the Endangered Species Act and for coastal restoration projects funded through programs like the Coastal Wetlands Planning, Protection and Restoration Act.
Activation of the floodway inundates rural lands including farms, timberlands, and communities within Pointe Coupee Parish and adjacent parishes, impacting landowners, agricultural operations such as rice and sugar producers represented by groups like the Louisiana Farm Bureau Federation, and infrastructure maintained by parishes and the Louisiana Department of Transportation and Development. Economic tradeoffs involve protecting major ports like the Port of New Orleans and industries including petrochemical complexes in St. James Parish and Plaquemines Parish against losses that could affect national freight carriers and shippers represented by the American Association of Port Authorities. Societal effects include displacement, compensation administered through federal programs and litigation involving private landowners, and interaction with social services coordinated by the Louisiana Office of Homeland Security and Emergency Preparedness.
The floodway was notably opened during the 1973 and 2011 high‑water events and was considered during the Great Flood of 1927 aftermath planning despite being built later, with operational precedents traced to uses of the Bonnet Carré Spillway in 1936 and subsequent major river floods such as the Mississippi Flood of 1973 and Mississippi River floods of 2011. Each deployment required interagency coordination among the United States Army Corps of Engineers, state governors including Edwin Edwards (historical context), and federal agencies such as the Federal Emergency Management Agency.
Controversies have arisen over property compensation, environmental justice concerns raised by groups including the Sierra Club and Louisiana Environmental Action Network, and legal disputes adjudicated in federal courts over takings claims under the Fifth Amendment to the United States Constitution and statutory interpretations of the Flood Control Act. Litigation and legislative scrutiny have involved stakeholders such as parish governments, private landowners, industry groups, and environmental organizations, with policy debates occurring in venues including the United States Congress and testimony before the House Committee on Transportation and Infrastructure.
Category:Infrastructure in Louisiana Category:Mississippi River Category:United States Army Corps of Engineers projects