Savannah River: The Georgia-Carolina Border

The Savannah River flows 301 miles from the confluence of the Tugaloo and Seneca Rivers in the Blue Ridge foothills to the Atlantic Ocean at Savannah, Georgia. For its entire length, the river forms the border between Georgia and South Carolina, a boundary established in the colonial era that has shaped the political geography of the Southeast.

Introduction

Beyond its role as a state boundary, the Savannah River has an outsized place in American history and national security. The Savannah River Site, a 310-square-mile Department of Energy facility on the river's banks, produced the plutonium and tritium for America's nuclear arsenal during the Cold War — making this quiet Southern river one of the most strategically important waterways in the nation.

Geography & Dimensions

• Length: 301 miles (484 km)
• Drainage Basin: 10,577 sq miles
• Average Discharge: 11,500 cu ft/s at mouth
• Source: Confluence of Tugaloo and Seneca Rivers

The Savannah River drains the eastern slopes of the Blue Ridge Mountains and the rolling Piedmont of western Georgia and South Carolina. Three major reservoirs — Hartwell, Russell, and Thurmond (formerly Clarks Hill) — impound the upper river, creating a chain of lakes that stretches nearly 120 miles. Below the dams, the river flows through the Sand Hills and Coastal Plain to the port city of Savannah.

The river's estuary at Savannah is one of the most important ports on the South Atlantic coast. The Port of Savannah is the third-busiest container port in the United States, handling over 5 million twenty-foot equivalent units (TEUs) annually. The harbor has been repeatedly deepened to accommodate ever-larger container ships, a process that alters tidal flows and affects the estuary's ecology.

Nuclear History

• Savannah River Site: 310 sq miles, established 1950
• Production: Plutonium and tritium for nuclear weapons
• Reactors: Five nuclear reactors operated 1953–1988
• Cleanup: Ongoing, estimated at $100+ billion over decades

In 1950, the US government selected a 310-square-mile tract along the Savannah River in South Carolina as the site for a massive nuclear weapons production complex. The Savannah River Site (SRS) built five nuclear reactors that produced plutonium and tritium for the nation's nuclear arsenal. At its peak, SRS employed over 30,000 workers and was one of the most secretive facilities in the country.

The nuclear operations left behind enormous quantities of radioactive waste, including 37 million gallons of liquid high-level waste stored in underground tanks. Cleanup of the Savannah River Site is one of the largest environmental remediation projects in the world, expected to cost over $100 billion and take decades to complete. Despite the contamination, the buffer zone around SRS has inadvertently preserved one of the largest tracts of relatively undisturbed land in the Southeast.

History & Culture

• City of Savannah: Founded 1733 by James Oglethorpe
• Cherokee and Creek: Displaced from the upper Savannah in the 1830s
• Augusta: Second-largest city on the river, home of the Masters
• Rice Culture: Lower Savannah was a major rice-growing region

The city of Savannah was founded in 1733 by James Oglethorpe as the first settlement in the Colony of Georgia. Its famous grid of squares, designed by Oglethorpe himself, is one of the finest examples of urban planning in the United States and draws millions of tourists annually. Augusta, upstream at the fall line, is known worldwide as the home of Augusta National Golf Club and the Masters Tournament.

The lower Savannah River was one of the most productive rice-growing regions in colonial and antebellum America. Enslaved Africans, many of whom came from rice-growing cultures in West Africa, provided both the labor and the agricultural knowledge that made the industry profitable. The remnants of tidal rice fields — elaborate systems of dikes, canals, and floodgates — are still visible along the lower river.

Ecology & Reservoirs

• Lake Hartwell: 56,000 acres, popular recreation area
• Striped Bass: Excellent fishery below Thurmond Dam
• Sturgeon: Shortnose sturgeon (endangered) in the lower river
• Longleaf Pine: SRS buffer zone protects rare ecosystems

The three major reservoirs on the upper Savannah — Hartwell, Russell, and Thurmond — cover over 120,000 acres combined and provide recreation for millions of visitors annually. The tailwaters below Thurmond Dam support an excellent striped bass fishery, with cold, oxygen-rich releases creating ideal conditions for these popular game fish.

The lower Savannah River supports populations of shortnose sturgeon, an endangered species, and occasional Atlantic sturgeon. The Savannah National Wildlife Refuge at the river's mouth preserves 29,000 acres of freshwater marshes, tidal rivers, and bottomland hardwoods that support over 260 bird species. Ironically, the buffer zone around the Savannah River Site has preserved some of the best remaining longleaf pine and Carolina bay habitats in the Southeast.

Challenges & Future

• Harbor Deepening: Controversial deepening to 47 feet for larger ships
• Water Wars: Georgia-South Carolina disputes over water allocation
• Saltwater Intrusion: Harbor deepening pushing saltwater further upstream
• Climate Change: Sea level rise threatening Savannah and coastal marshes

The deepening of the Savannah Harbor to 47 feet, completed in stages through the 2020s, has been one of the most contentious infrastructure projects in the Southeast. South Carolina fought the deepening for years, arguing it would push saltwater further upstream and damage freshwater marshes. Mitigation measures, including a dissolved oxygen injection system, were required to offset ecological damage.

Georgia and South Carolina have engaged in decades of legal disputes over Savannah River water. As Atlanta's population has grown, Georgia has sought to increase water withdrawals from Lake Lanier (a separate watershed) and the Savannah basin, raising South Carolina's objections. Climate change, sea level rise, and the increasing intensity of hurricanes add further stress to the river's estuary and the city of Savannah, much of which sits only a few feet above sea level.

Key Facts

• The Savannah River flows 301 miles, forming the Georgia-South Carolina border.
• The Savannah River Site produced plutonium and tritium for nuclear weapons during the Cold War.
• The Port of Savannah is the third-busiest container port in the US.
• Three major reservoirs on the upper river cover over 120,000 acres.
• The city of Savannah was founded in 1733 with one of America's finest planned urban designs.

Fun Facts

• The Savannah River Site's 310-square-mile buffer zone accidentally became one of the best wildlife refuges in the Southeast — red-cockaded woodpeckers and other rare species thrive there.
• The city of Savannah's famous squares were originally designed as military parade grounds that could be used to muster troops in case of attack.
• Rice plantations on the lower Savannah depended on West African agricultural knowledge brought by enslaved people — the planters couldn't have succeeded without their expertise.
• The Masters Tournament at Augusta National is played just a few miles from the Savannah River's fall line.

Final Thoughts

The Savannah River is a river of contrasts — a graceful Southern waterway that harbors one of the world's largest nuclear waste cleanup sites, a colonial treasure that witnessed the brutality of plantation slavery, a natural boundary that two states continue to fight over. Its story encapsulates the complexity of the American South.