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| Great Flood of 1993 (Midwestern United States) | |
|---|---|
| Name | Great Flood of 1993 |
| Caption | Flooded Mississippi River near St. Louis during 1993 |
| Date | April–October 1993 |
| Location | Midwestern United States; principal states: Missouri, Iowa, Illinois, Minnesota, Wisconsin, Kansas, Nebraska, South Dakota, North Dakota |
| Type | Riverine flooding |
| Fatalities | ~50–60 |
| Damage | >$15 billion (1993 USD) |
Great Flood of 1993 (Midwestern United States) The Great Flood of 1993 was a prolonged and widespread riverine flood across the Midwestern United States that inundated vast areas of the Mississippi River, Missouri River, and their tributaries, producing one of the costliest and most extensive inland flood events in United States history. Intense spring and summer precipitation produced record flows that overwhelmed levees, inundated cities, displaced tens of thousands of people, and triggered major federal, state, and local responses involving agencies such as the Federal Emergency Management Agency, the United States Army Corps of Engineers, and the National Weather Service.
Persistent, anomalous precipitation patterns in 1992–1993 set the stage: successive storms from the Pacific Northwest and Gulf of Mexico moisture streams contributed to saturated soils in the Upper Mississippi River Basin and Missouri River Basin. A strong El Niño–Southern Oscillation configuration and atmospheric river events produced heavy rains that affected headwaters in Minnesota, Wisconsin, and Iowa. Snowmelt from the Rocky Mountains and late-season runoff compounded runoff into the Missouri River and Mississippi River, while antecedent wetness conditions in states such as Illinois and Missouri limited infiltration. Hydrologists from institutions including the United States Geological Survey and the National Oceanic and Atmospheric Administration analyzed changed precipitation gradients, soil-moisture anomalies, and River forecast models from the Hydrologic Engineering Center that together explained extreme discharge magnitudes and prolonged high stages.
Flooding began in spring 1993, escalating in May and June as major tributaries, notably the Iowa River, Des Moines River, Missouri tributaries, and Ohio River affected different reaches of the system. Record crests occurred in summer months with catastrophic stages along the Mississippi River at St. Louis, Cairo, and Burlington; concurrent flooding affected Kansas City, St. Joseph, Dubuque, Memphis, and other river communities. Levee breaches and overtopping were widespread from April through August; the United States Army Corps of Engineers engineers operated floodways such as the Birds Point-New Madrid Floodway and purposeful diversions near New Madrid to relieve pressure. Flood stages persisted into autumn in portions of the basin, with some areas experiencing repeated inundation through October.
The event produced extensive property, infrastructure, and agricultural losses. Urban and rural areas experienced major damage to transportation networks including segments of the Interstate Highway System like Interstate 80 and Interstate 55, rail corridors used by Amtrak and freight carriers, and critical utilities in cities such as St. Louis, Cedar Rapids, and Quincy. Agricultural losses affected row crops in Iowa, Illinois, and Missouri, with farm organizations such as the American Farm Bureau Federation documenting massive crop and livestock impacts. Economic sectors including river commerce on the Mississippi River and grain export operations at ports like New Orleans experienced disruptions. Fatalities were reported in states including Missouri, Iowa, and Illinois; displacement and homelessness prompted shelter operations by groups like the American Red Cross and local faith-based organizations. Historic sites and cultural institutions in towns including Grafton and Portage des Sioux sustained damage.
Federal, state, and local responders coordinated actions involving the Federal Emergency Management Agency, the United States Army Corps of Engineers, the National Guard, and the National Weather Service. Evacuations and emergency rescues used assets from the United States Coast Guard Auxiliary, state police, and volunteer organizations including Salvation Army units and American Red Cross chapters. Relief funding and disaster declarations by successive United States Presidents authorized Public Assistance and Individual Assistance programs; congressional delegations from affected states sought supplemental appropriations. Engineers executed levee closures, emergency sandbagging, and controlled breaching at sites such as the Birds Point-New Madrid Floodway; international assistance and private philanthropic efforts supplemented federal aid via entities like the United Nations office in Washington and large NGOs.
Post-flood recovery entailed rebuilding levees, restoring transportation infrastructure, and revising floodplain management practices. The United States Army Corps of Engineers and state natural resources departments implemented levee inspections and retrofits, while the Federal Emergency Management Agency updated flood maps and flood insurance program rules administered by the National Flood Insurance Program. Legislation and policy discussions in the United States Congress led to changes in funding for mitigation, buyout programs for repeatedly flooded properties, and revisions to the National Response Plan. Local governments adopted zoning and land-use reforms; municipal utilities in St. Louis County and Polk County invested in hardened critical infrastructure. Academic institutions such as the University of Iowa, Iowa State University, and University of Missouri conducted post-event research on hydrology and risk reduction.
Environmental effects included altered riverine sediment transport, changes in Mississippi River Delta sediment delivery, and ecosystem impacts on wetlands and floodplain forests managed by agencies such as the United States Fish and Wildlife Service. Aquatic habitats and water quality in tributaries like the Des Moines River experienced nutrient and pollutant mobilization; conservation groups including The Nature Conservancy and state conservation commissions evaluated habitat loss. Economically, the interstate commerce disruptions affected barge operators, grain exporters, and manufacturing hubs in Midwestern United States metro areas; insurance industry losses influenced carriers headquartered in cities such as Chicago, prompting reinsurance negotiations with firms in New York City and London. Long-term changes in farm income, rural employment, and urban redevelopment patterns were documented by researchers at the Brookings Institution and the Economic Research Service of the United States Department of Agriculture.
The flood reshaped regional emergency planning and is commemorated in museum exhibits at institutions including the National Mississippi River Museum & Aquarium and local historical societies in Iowa and Missouri. Memorial events and plaques in communities such as Valmeyer—which relocated after catastrophic inundation—mark losses and resilience. The event entered curricula at universities like the University of Illinois and inspired literature and documentary treatments by media outlets including PBS, the History Channel, and print coverage in newspapers such as the St. Louis Post-Dispatch and the Des Moines Register. Policymakers and engineers continue to reference the 1993 floods when debating flood control investments, floodplain buyouts, and climate resilience strategies at forums including the National Academy of Sciences and congressional hearings.
Category:Floods in the United States Category:1993 in the United States