J. Strom Thurmond Dam

J. Strom Thurmond Dam is a major multi-purpose dam located on the Savannah River at the border between Georgia and South Carolina. Owned and operated by the United States Army Corps of Engineers, it forms Clarks Hill Lake, one of the largest reservoirs in the Southeastern United States. The dam was constructed as part of a comprehensive plan for the Savannah River Basin following the Great Depression and significant flooding events.

History and construction

Planning for the dam intensified after the devastating Flood of 1936 highlighted the need for improved flood control in the Savannah River Basin. Authorized by the Flood Control Act of 1944, construction began in 1946 under the supervision of the Savannah District of the United States Army Corps of Engineers. The project required the relocation of communities, including the town of Clark's Hill, South Carolina, and the acquisition of extensive tracts of land. The dam was completed and dedicated in 1954, originally named the Clarks Hill Dam after the nearby community. In 1987, it was renamed by an act of the United States Congress to honor longtime United States Senator J. Strom Thurmond of South Carolina.

Design and specifications

The dam is a composite structure featuring a central concrete gravity dam section flanked by earthen embankment dam wings. It stretches approximately 1.5 miles (2.4 km) across the Savannah River valley. The concrete section houses the dam's powerhouse and contains eight Francis turbine generators. The reservoir, Clarks Hill Lake, has a normal pool elevation of 330 feet (101 m) above mean sea level and boasts over 1,200 miles (1,930 km) of shoreline. The dam's spillway is a gated ogee crest designed to manage extreme inflow events from the upstream watershed.

Operations and purpose

Primary operations are managed by the Savannah District from the Hydropower Operations Center in Savannah, Georgia. The dam's multipurpose mission prioritizes flood control, followed by navigation support for the downstream Port of Savannah, hydropower generation, water supply, and recreation. Water releases are carefully coordinated with downstream projects like the Richard B. Russell Dam and the Hartwell Dam to maintain river stages for barge traffic and to meet environmental flow requirements for estuarine health near Tybee Island.

Environmental and ecological impact

The creation of Clarks Hill Lake transformed the local ecology, inundating riverine habitats and creating a large lentic system. The United States Army Corps of Engineers conducts ongoing management of water quality, fish populations, and aquatic plant growth. The dam's regulated flow regime has altered downstream sediment transport and temperature profiles, impacting native species. The agency collaborates with the South Carolina Department of Natural Resources and the Georgia Department of Natural Resources on fisheries programs, including stocking popular sportfish like largemouth bass and striped bass.

Recreational use

Clarks Hill Lake is a premier recreational destination managed by the United States Army Corps of Engineers. Major facilities include the Clarks Hill Park, Bobby Brown State Park, and the Elijah Clark State Park. The reservoir supports extensive activities such as boating, fishing, camping, and hunting on surrounding wildlife management areas. Annual events like bass fishing tournaments hosted by Major League Fishing draw significant tourism to Columbia County and McCormick County, South Carolina.

Category:Dams in Georgia (U.S. state) Category:Dams in South Carolina Category:Buildings and structures in Columbia County, Georgia Category:United States Army Corps of Engineers