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Rising water can push coastal forests toward dieback and marsh—but not through sea-level rise alone. Saltwater intrusion, flooded and oxygen-poor soils, sinking land, storms, and changes within watersheds can combine to kill trees and leave standing trunks in brackish wetlands. These “ghost forests” mark a changing boundary between woodland, wetland, and open water.
What is a ghost forest?
A ghost forest is the watery remains of a once-living woodland: dead or dying trees still standing as the conditions around them shift. Along coasts and estuaries, trees adapted to freshwater may be left in brackish water as saltwater reaches inland. NOAA describes ghost forests as visible signs of environmental change on low-lying coastal plains. NOAA’s overview of ghost forests was last updated September 23, 2026.
The term describes a transition, not necessarily a forest that has already become open water. A site may move from tidal freshwater forest to standing dead trees and, in some places, toward low-salinity marsh. The pace and eventual landscape depend on local conditions.
How does rising water stress trees?
Saltwater reaches farther inland
In upper estuaries, river water meets tidal seawater. As sea levels rise, tidal saltwater can move farther upstream into areas that were fresher. High tides and storm surges can also carry salt into soils and shallow groundwater. If salinity exceeds the tolerance of the trees growing there, they become stressed and may die; the altered conditions can also make it harder for young trees to establish.
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USGS describes the transition from tidal freshwater forested wetland to ghost forest and then to oligohaline, or low-salinity, marsh. As the agency puts it: “As sea levels rise, tidal forces move saltier water farther upstream, extending into freshwater wetland areas.” See the USGS account of tidal extension in upper estuaries.
Waterlogged soils can limit root oxygen
Salt is not the only threat. Rising groundwater can saturate low-lying soils, limiting the oxygen available to roots. Prolonged saturation can stress established trees and hinder regeneration even where direct salt exposure is not the main cause. USDA notes that the relative importance of groundwater rise and saltwater flooding varies by site. Its overview of coastal forest dieback explains these linked stresses.
Land and watershed changes shape the outcome
“Rising water” does not mean the same process is operating everywhere. Relative sea-level rise can be amplified where land is sinking. NOAA points to land subsidence in the Chesapeake Bay watershed, associated with the last ice age, and to sinking crust and compacting river sediments in Louisiana’s Mississippi Delta. Tides, storms, local development, dams, dredging, and watershed inputs can further influence where salt and water move.
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That mix helps explain why coastal forest change is documented across the Southeast and mid-Atlantic, including upper estuaries, North Carolina maritime forests, and South Carolina’s Sampit River. The examples show a regional pattern, not a complete national inventory.
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What the North Carolina measurements show—and do not show
A 2020 study by Smart and colleagues examined a coastal North Carolina study region using repeat LiDAR surveys, satellite imagery from multiple dates, and field measurements of aboveground biomass. It found that 15% of unmanaged public land in that study region—167 km²—changed from coastal forest to transition-ghost forest between 2001 and 2014. Salinity and proximity to the estuarine shoreline were significant drivers. The authors suggest that aboveground carbon decline can indicate the advancing edge of sea-level rise, since saltwater can affect vegetation before mature trees die or land is inundated. The study in Environmental Research Letters reports the methods and results.
In that same study region and period, the forest-to-transition-ghost-forest conversion was associated with a net aboveground carbon decline of 0.13 ± 0.01 TgC. A separate whole-area accounting reported 2.46 ± 0.25 TgC net aboveground carbon across the study area, reflecting inland carbon gains from succession and forestry that offset shoreline declines. The whole-area figure is not the carbon loss from ghost-forest conversion.
These are measurements for one North Carolina study region over 2001–2014, not a current nationwide rate or count. The cited work does not establish how many ghost forests exist across the United States today or how quickly they are expanding nationally.
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Ghost forests are more than a visible sign of dead trees. Tidal freshwater forested wetlands and neighboring marshes contribute to coastal “blue carbon” systems, water quality, habitat, fisheries, and protection from coastal storms. Forests also provide habitat for rare plants and wildlife and have timber value. As a site changes, those services may shift rather than disappear in the same way everywhere: the effects depend on what replaces the forest, what habitat is lost, and the landscape’s exposure and connections.
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USGS identifies carbon, water quality, coastal resilience, wildlife, and fisheries among the concerns in upper-estuary wetland change. Coastal wetlands can help buffer storm surge and mitigate downstream eutrophication, while providing habitat for wildlife and fish. USDA likewise notes that coastal forests and adjacent salt marshes can help buffer inland areas from storms. A forest-to-marsh transition therefore involves ecological trade-offs and place-specific consequences, not simply a visual loss of trees.
Can communities slow or adapt to forest dieback?
There is no single intervention that applies everywhere, and preventing further dieback may not be feasible in many locations. USDA lists approaches for local evaluation, including:
- Revegetating with species more tolerant of salty or flooded soils.
- Protecting or restoring adjacent land so forests have room to migrate inland.
- Considering living shorelines or sediment placement.
- Evaluating water-management infrastructure such as ditches, dikes, barriers, or tide gates.
Each option involves trade-offs and depends on site conditions; these are possibilities to assess, not guaranteed ways to stop forest loss. A useful local assessment considers relative sea-level rise and land subsidence; tidal range and storm-surge exposure; groundwater depth, saturation, and salinity; freshwater and sediment inputs; land use and barriers to inland migration; and the services a particular site provides. USGS emphasizes that conditions and ecosystem services vary across upper estuaries, and that data on the causes and impacts of tidal extension remain limited. Region-wide mapping and continued monitoring can help inform decisions.
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