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| Great River Dam | |
|---|---|
| Name | Great River Dam |
| Location | Mississippi River corridor near St. Louis, Missouri / Illinois border |
| Status | Operational |
| Opening | 1958 |
| Owner | Army Corps of Engineers |
| Dam type | Concrete gravity / embankment |
| Height | 120 ft |
| Length | 8,200 ft |
| Reservoir | Great River Reservoir |
| Capacity | 1,200,000 acre-ft |
| Plant capacity | 420 MW |
Great River Dam
The Great River Dam is a major multipurpose dam and reservoir complex on the middle reach of the Mississippi River that provides flood control, hydroelectric power, navigation, water supply, and recreation. The project, completed in the mid-20th century, is administered by the United States Army Corps of Engineers and intersects the jurisdictions of Missouri, Illinois, and several riverine counties including St. Louis County, Missouri and Madison County, Illinois. It has been central to regional infrastructure, referenced in federal planning by agencies such as the Bureau of Reclamation and the Federal Energy Regulatory Commission.
The facility comprises a concrete spillway, earthen embankments, a lock complex connected to the Upper Mississippi navigation system, and a hydroelectric plant operated by a public utility district in partnership with the Tennessee Valley Authority style regional authorities. The reservoir, Great River Reservoir, supports municipal intakes serving cities like St. Louis, Alton, Illinois, and Cape Girardeau while also underpinning industrial water uses for companies headquartered in St. Louis Metropolitan Area, including manufacturing sites linked to Anheuser-Busch and chemical plants near East St. Louis. The site is a strategic node on transportation corridors including Interstate 55, U.S. Route 67, and rail lines owned by Union Pacific Railroad and BNSF Railway.
Initial proposals for a large-scale dam at the site date to the 1930s plans by the Tennessee Valley Authority and the Missouri River Basin Project proponents; wartime priorities and the New Deal programs delayed early construction. Congressional authorization followed hearings in the United States House Committee on Public Works and the United States Senate Committee on Public Works during the postwar era, drawing testimony from engineers representing the Army Corps of Engineers and consultants from Harvard University and Massachusetts Institute of Technology. Groundbreaking occurred in 1952 with oversight by engineers previously involved in the Hoover Dam and the Bonneville Dam projects. The dam was dedicated in a ceremony attended by officials from the Department of the Interior and state governors from Missouri and Illinois.
Engineers used designs influenced by the Bonneville Dam spillway arrangements and the gravity-arch principles applied at Glen Canyon Dam. The concrete segment incorporates radial gates modeled after prototypes from the Shasta Dam project, while the embankment sections drew on materials science research from Oak Ridge National Laboratory and geotechnical surveys performed by the United States Geological Survey. Construction contractors included Bechtel Corporation and subsidiaries of the Kiewit Corporation under fixed-price contracts administered through the Public Works Administration legacy procurement offices. Innovations included a cofferdam system similar to that used on the Ems River projects and precast modules tested at Sandia National Laboratories.
The facility is operated under an integrated schedule coordinated with the Mississippi River Commission and the National Weather Service River Forecast Center. Reservoir management balances flood control for historic events such as the Great Flood of 1993 with low-flow augmentation during droughts like the 2006 North American drought. The hydropower plant uses Kaplan and Francis turbines licensed through the Federal Energy Regulatory Commission, selling power into regional grids managed by Midcontinent Independent System Operator and Ameren Missouri. Navigation through the adjacent lock complex is regulated in accordance with standards from the U.S. Coast Guard and the Institute of Navigation studies, supporting barge traffic that serves terminals linked to ConocoPhillips and agricultural elevators associated with Archer Daniels Midland.
Environmental review processes engaged agencies including the Environmental Protection Agency and the Fish and Wildlife Service, with mitigation plans drawing on ecological research from University of Missouri and University of Illinois Urbana-Champaign. Impacts included alteration of floodplain habitats for species studied by The Nature Conservancy and shifts in migratory patterns documented by ornithologists from the Audubon Society. Socioeconomic effects involved relocation assistance administered under statutes debated in the United States Congress and implemented with county governments such as St. Charles County, Missouri offices. Restoration projects have partnered with The Conservation Fund and the National Fish and Wildlife Foundation.
The reservoir and adjacent parks are managed with input from the Missouri Department of Natural Resources and the Illinois Department of Natural Resources, hosting marinas, campgrounds, and trails promoted by regional tourism bureaus including Explore St. Louis and the Illinois Office of Tourism. Annual events draw visitors from Kansas City to Chicago, and recreation programming has been coordinated with nonprofit organizations such as American Rivers and the National Park Service where interpretive centers present exhibits developed with curators from the Smithsonian Institution.
Legal disputes have involved plaintiffs represented by firms that litigated cases similar to those before the U.S. Supreme Court and the Eighth Circuit Court of Appeals, challenging compliance with the National Environmental Policy Act and the Clean Water Act. Cases referenced precedents like Tennessee Valley Authority v. Hill and administrative rulings by the Federal Energy Regulatory Commission; settlements included consent decrees negotiated by the Department of Justice and state attorneys general from Missouri and Illinois. Ongoing debates involve proposals from advocacy groups such as Sierra Club and Friends of the River about operational modifications and habitat restoration funding.
Category:Dams in Missouri Category:Dams in Illinois Category:Mississippi River