in 2019 (north is in the lower left of the photo) A tall ridge of sand dunes that survived the melting of the Earth's glaciers gave rise to the barrier islands that make up the Outer Banks. By protecting the coastal mainland from the raging waves and storms of the ocean, barrier islands get their name. The Outer Banks is a string of peninsulas and barrier islands separating the Atlantic Ocean from mainland
North Carolina. From north to south, the largest of these include:
Bodie Island (which used to be an island but is now a peninsula due to tropical storms and hurricanes that closed inlets that separated it from the Currituck Banks),
Pea Island (which has, at times, been contiguous with neighboring Bodie Island or Hatteras Island),
Hatteras Island,
Ocracoke Island,
Portsmouth Island, and the
Core Banks. Over time, the exact number of islands and inlets changes as new inlets are opened up, often during a breach created during violent storms, and older inlets close, usually due to gradually shifting sands during the processes of
beach evolution. The Outer Banks stretch southward from
Sandbridge in
Virginia Beach down the North Carolina coastline. Sources differ regarding the southern terminus of the Outer Banks. The most extensive definition includes the state's three prominent capes:
Cape Hatteras,
Cape Lookout, and
Cape Fear. Other sources limit the definition to two capes (
Cape Hatteras and
Cape Lookout) and coastal areas in four counties (
Currituck County,
Dare County,
Hyde County, and
Carteret County). Some authors exclude Carteret's
Bogue Banks; others exclude the county entirely. The northern part of the Outer Banks, from
Oregon Inlet northward, is actually a part of the
North American mainland, since the northern inlets of Bodie Island and Currituck Banks no longer exist. It is separated by the
Currituck Sound and the
Intracoastal Waterway, which passes through the
Great Dismal Swamp occupying much of the mainland west of the Outer Banks. Road access to the northern Outer Banks is cut off between
Sandbridge and
Corolla, North Carolina, with communities such as
Carova Beach accessible only by
four-wheel drive vehicles.
North Carolina State Highway 12 links most of the popular Outer Banks communities in this section of the coast. The easternmost point is Rodanthe Pier in
Rodanthe, North Carolina. The Outer Banks are not anchored to offshore
coral reefs like some other barrier islands, and as a consequence, they often suffer significant
beach erosion during major storms. In fact, their location jutting out into the Atlantic makes them the most
hurricane-prone area north of
Florida, for both landfalling storms and brushing storms offshore. Hatteras Island was cut in half on September 18, 2003, when
Hurricane Isabel washed a 2,000 feet (600 m) wide and 15 feet (5 m) deep channel called
Isabel Inlet through the community of Hatteras Village on the southern end of the island. The tear was subsequently repaired and restored by
sand dredging by the
U.S. Army Corps of Engineers. It was cut off once again in 2011 by
Hurricane Irene. Access to the island was largely limited to boat access only from August to late October until another temporary bridge could be built. Three state highway bridges connect the Outer Banks to the mainland. The
Wright Memorial Bridge, the oldest (built in 1930, rehabilitated in 1966), carries
US 158 between
Point Harbor and
Kitty Hawk.
William B. Umstead Bridge, the second oldest (built in 1957, rehabilitated in 1966), carries
US 64 between
Manns Harbor on the mainland and
Manteo on
Roanoke Island. The newest bridge, the
Virginia Dare Memorial Bridge, was completed in 2002 and carries US 64 Bypass between Manns Harbor and Roanoke Island between Manteo and
Wanchese. The Washington Baum Bridge and Melvin R. Daniels Bridge carry US 64 between Roanoke Island and
Nags Head. At
Whalebone Junction, the three main highways of the Outer Banks (NC 12, US 158, and US 64) all meet. Additionally,
NC 615 serves as the main route along
Knotts Island in the extreme north; it connects only to Virginia by land. A number of ferries maintained by the
North Carolina Department of Transportation Ferry Division also serve the Outer Banks. From north to south, these are the Knotts Island-Currituck Ferry, the Hatteras-Ocracoke Ferry, the Swan Quarter-Ocracoke Ferry, and the Cedar Island-Ocracoke Ferry. Additionally, a semi-regular emergency ferry often runs from
Stumpy Point to Rodanthe to serve travelers due to frequent wash-outs of NC 12 between Nags Head and Rodanthe. Additionally, private ferries are commissioned by the National Park Service to access certain islands within the National Seashores along the outer banks, these include ferries to
Portsmouth Island, to
Cape Lookout Lighthouse, and various locations along
Core Banks and
Shackleford Banks. Unlike other parts of North Carolina, which have very stable geography, the geography of the Outer Banks is constantly shifting. It is estimated that the outer banks drift several feet each year. The result of these changes is not certain, with theories ranging from the island shrinking in width, moving further inland, or sinking into the ocean. The North Carolina Department of Transportation intends to construct a new bridge connecting Currituck County to the Outer Banks. This bridge would span 7 miles long, and construction is planned to begin in 2026. The main intention of the bridge is to alleviate traffic congestion in the event that an evacuation of the outer banks is required, in the event of a storm. ==Ecology==