As a National Wildlife Refuge, the Okefenokee swamp was protected specifically for its value in supporting and maintaining the populations of America’s wildlife and their habitats. A Comprehensive Conservation Plan specifically created for the refuge reviews its conservation needs and major threats, setting out a strategy for preserving the Okefenokee. The swamp is also classified as a wilderness area, the highest form of protection of any federal wildland. These protections mean that the ecosystems and natural features within the protected area of the Okefenokee are to be preserved for the future, with no commercial enterprise or development occurring within its boundaries. A major focus of wilderness areas according to The Wilderness Act of 1964 is to protect endangered and threatened species, and to preserve the untouched “wilderness character” of the region. All of these protections ensure that the Okefenokee is protected from internal threats.
Unfortunately, many of the Okefenokee’s greatest threats come from the surrounding, adjacent areas of land, which have no form of protection. In other words, the most severe impacts on the swamp are now coming from beyond the area in which it is protected, where it is difficult to prevent damage to the ecosystem. Changes in the surrounding landscape have been accelerating in recent decades, with commercial and residential development, as well as intensifying agriculture, replacing forestry lands. Because the lands outside of the Okefenokee are primarily privately owned, rapid turnover in management has occurred with little consideration or understanding of how these changes might affect the swamp.
Changes in land use have strong impacts on both the quantity and quality of water in the swamp. Since water is the Okefenokee’s lifeblood, these changes could have damaging impacts over time. Shifts in land use around the swamp have led to increases in the rates at which water leaves the swamp, primarily through groundwater drainage. Although its designation as a National Wildlife Refuge and wilderness area protect the Okefenokee’s waters from being extracted within its boundaries, those waters are connected underground to groundwater in the surrounding area. As those are used up, water from inside the refuge flows outward and is drained. Combined with higher levels of groundwater removal for agricultural, commercial, and residential purposes, increased water use and landscape change are lowering the water table of the Okefenokee, negatively affecting plant and wildlife habitat. Reductions in the amount of water on the Okefenokee landscape also changes the patterns of wildfires, which can also change important habitats.
The intensification of economic activity and land use around the refuge has also degraded water quality in the swamp. While sediments and nitrates entered the Okefenokee’s waters because of surrounding forestry processes, the amount of these pollutants has increased with more agricultural, residential and commercial land uses. These types of land cover contribute stormwater runoff that also contains heavy metals, fertilizers, herbicides, and pharmaceuticals. Some pollutants suspended in the atmosphere from coal power plants and automotive use are also deposited regularly in the Okefenokee’s water. These pollutants can harm wildlife and change habitats by favoring certain species of vegetation over others. Mining operations have the dual impact of increasing water contamination with a variety of pollutants and changing the drainage of the landscape around the Okefenokee, impacting both water quality and quantity.
These changes are particularly impactful because they synergize or combine with many of the effects of climate change. Observations and predictions for climate impacts on the Okefenokee indicate that the swamp will be receiving less water and experiencing increased frequency and intensity of wildfires. With these various factors combining to drive wildfire and a reduction in water on the landscape, these pressures could impact the goals of the Okefenokee’s protected status. Specifically, these threats could change the natural character of the swamp, and reduce its ability to support important wildlife.
Current and Recent Threats to the Swamp Ecosystem
Mineral sand mining on Trail Ridge east of the swamp is a potential threat to swamp hydrology and ecology.
Many of the old barrier island features of the Atlantic Coastal Plain, including Trail Ridge, contain relatively high fractions (1.5-5%) of titanium or mineral sands. More than 2% is considered commercially valuable. These are dark, relatively dense sands containing commercially-valuable levels of titanium, zircons, and rare earth elements. These mineral sands are mined by removing all of the sands from pits that are typically 10-20 meters deep, extracting the mineral sands from the non-mineral sands, and putting the non-mineral sands back in the pit. The pits move back and forth across the mining area until all the sands have been mined, and approximately 95-98% of the sands are returned. Ideally, the mine site is “reclaimed” by restoring the topsoils and grading the site to approximately its original topography. Mineral sand mining of these old barrier islands has been common in Florida and Georgia, and much of the Florida section of Trail Ridge below Interstate 10 has been mined since the late 1940s.
Restoring the pre-mining soils, vegetation, and ecology of these sand ridges is difficult. These ridges typically feature a relatively high density of depressional wetlands and ill-defined intermittently-flowing drainage swales that provide wetland habitat for plants, insects, birds, amphibians, and reptiles. They also feature thin topsoils with high organic matter content. Most of the nutrient cycling for the forests that grow on these ridges takes place in these thin topsoils. Restoring these topsoils, depressional wetlands, and drainage swales is difficult, and some of the previously-mined portions of Trail Ridge in Florida show difficulty with forest regeneration and growth.
Mineral sand mining on Trail Ridge east of the swamp could affect the hydrology, drought frequency, and ecology of the swamp in several possible ways. First, continuous pumping of superficial aquifer water is necessary to keep the mine pits nearly dry. This pumping would remove water that would otherwise flow to the swamp. Second, the mines have to pump clean operations water from the Floridan aquifer below the swamp, increasing the rate of leakage from the swamp to the Floridan aquifer. Third, the mixed sands returned to the pits would move water faster than the layered sands removed from the pits, and this would increase the lateral flow eastward through Trail Ridge. All of these hydrologic changes would make the southeastern portion of the swamp more sensitive to drought. Droughts, which are natural in the swamp, would become more frequent and severe.
One past and one current mining operation have been proposed on Trail Ridge east of the swamp. In the 1990s the Dupont corporation proposed a very large Trail Ridge mine (38,000 acres). This proposal generated widespread opposition from the grassroots level up to the Secretary of the Interior, Bruce Babbitt, and Dupont eventually abandoned its plan. Dupont donated 16,000 acres to the Conservation Fund and sold the rest back to timber interests.
In 2018, Twin Pines LLC proposed a plan to conduct phased mining from south to north on Trail Ridge, starting just above GA State Route 94 west of the town of St. George in Charlton County. The high density of wetlands on this property created federal wetland permitting issues under the US Clean Water Act; these were complicated by shifting definitions of jurisdictional wetlands (“Waters of the United States”) under successive federal administrations. As of now, the USACE has determined that none of the wetlands on the proposed mine site fall under Clean Water Act jurisdiction, and the surface mining permit is under review by Georgia EPD: Twin Pines | Environmental Protection Division (georgia.gov).
On Jan. 19, 2023 the Georgia EPD opened its 60 day comment period to seek public input on whether or not it should issue a permit for a proposed mine. Individuals can comment by emailing: email@example.com.
On Feb. 20, 2023, eleven southeastern hydrologists published a letter to Georgia EPD and interested parties concerning the appropriate streamflow data for assessing how the proposed TPM LLC mine groundwater withdrawals will affect Okefenokee Swamp hydrology. The letter can be accessed here.
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