A screw-pile lighthouse is a lighthouse which stands on piles that are screwed into sandy or muddy sea or river bottoms. The first screw-pile lighthouse to begin construction was built by the blind Irish engineer Alexander Mitchell. Construction began in 1838 at the mouth of the Thames and was known as the Maplin Sands lighthouse, and first lit in 1841. However, though its construction began later, the Wyre Light in Fleetwood, Lancashire, was the first to be lit.
The Seven Foot Knoll Light was built in 1855 and is the oldest screw-pile lighthouse in Maryland. It was located atop Seven Foot Knoll in the Chesapeake Bay until it was replaced by a modern navigational aid and relocated to Baltimore's Inner Harbor as a museum exhibit.
Race Rock Light is a lighthouse on Race Rock Reef, a dangerous set of rocks on Long Island Sound southwest of Fishers Island, New York and the site of many shipwrecks. It is currently owned and maintained by the New London Maritime Society as part of the National Historic Lighthouse Preservation Act program.
The Thomas Point Shoal Light, also known as Thomas Point Shoal Light Station, is a historic lighthouse in the Chesapeake Bay on the east coast of the United States, and the most recognized lighthouse in Maryland. It is the only screw-pile lighthouse in the bay which stands at its original site. The current structure is a 1½ story hexagonal wooden cottage, equipped with a foghorn as well as the light.
A Texas Tower lighthouse is a structure which is similar to an off-shore oil platform. Seven of these structures were built in the 1960s off the shores of the United States. Automation started in the late 1970s, which led to the obsolescence of the housing built for the keepers which resulted in such a large structure. Three of the towers were dismantled over time due to deteriorating structural conditions among other problems, while another one was destroyed in a ship collision. The last Texas Tower was deactivated in 2016 having served for over half a century. Today only three of the former lights remain.
The Harbor of Refuge Light is a lighthouse built on the ocean end of the outer Delaware Breakwater at the mouth of the Delaware Bay, just off Cape Henlopen. It was built to function with the Delaware Breakwater East End Light in order to mark the National Harbor of Refuge.
Orient Point Light is a sparkplug lighthouse off Orient Point, New York in Plum Gut of Long Island Sound – the deep and narrow gap between Orient Point and Plum Island. It was built in 1899 and was automated in 1954. The lighthouse was listed on the National Register of Historic Places in 2007.
Greens Ledge Lighthouse is a historic offshore lighthouse in the western Long Island Sound near Norwalk, Connecticut and Darien, Connecticut. It is one of 33 sparkplug lighthouses still in existence in the United States and remains an active aid to navigation. It sits in ten feet of water on the west end of Greens Ledge, a shallow underwater reef that runs a mile west of Sheffield Island and is roughly a mile south of the entrance to Five Mile River at Rowayton. Completed in 1902 by the Philadelphia Construction Company, the cast-iron structure is approximately 90 feet tall including roughly 15 feet of the submerged caisson. In 1933, more than 30,000 tons of rocks from the excavation of Radio City Music Hall were added to the riprap foundation. The light was added to the National Register of Historic Places as Greens Ledge Lighthouse on May 29, 1990.
Southwest Ledge Light is an active lighthouse marking the main entrance channel to the harbor of New Haven, Connecticut. Completed in 1877, it was one of the first to be built on a cylindrical iron foundation, an innovation by Maj. George H. Elliot to address shifting ice that is regarded to be very important in lighthouse design. The lighthouse was listed on the National Register of Historic Places in 1990 as Southwest Ledge Lighthouse.
The Pungoteague Creek Light was a small screwpile lighthouse constructed in the Chesapeake Bay in 1854. Destroyed in 1856, it had the shortest recorded existence of any lighthouse on the Bay, and possibly the United States, at just 459 days.
Sandy Point Shoal Light is a brick three story lighthouse on a caisson foundation that was erected in 1883. It lies about 0.6 mi (0.97 km) off Sandy Point, north of the Chesapeake Bay Bridge, from whose westbound span it is readily visible.
Wolf Trap Light is a caisson lighthouse in the Virginia portion of the Chesapeake Bay, about seven and a half miles northeast of New Point Comfort Light. It is listed on the National Register of Historic Places.
The National Historic Lighthouse Preservation Act of 2000 is American legislation creating a process for the transfer of federally owned lighthouses into private hands. It was created as an extension of the National Historic Preservation Act of 1966.
The Elbow of Cross Ledge Light was a lighthouse on the north side of the ship channel in Delaware Bay in Cumberland County, New Jersey, on the east coast of the United States, west of Egg Island Point. It was destroyed by a ship collision in 1953 and replaced by a skeleton tower on the same foundation.
The Cross Ledge Light was a lighthouse on the north side of the ship channel in Delaware Bay off of Cumberland County, New Jersey on the East Coast of the United States, southwest of Egg Island Point. It was replaced by the Elbow of Cross Ledge Light and the Miah Maull Shoal Light in the early 1900s and razed by the United States Coast Guard in 1962.
The Brandywine Shoal Light is a lighthouse on the north side of the ship channel in Delaware Bay on the east coast of the United States, west of Cape May, Cape May County, New Jersey, United States. It was the site of the first screw-pile lighthouse in the United States.
The Miah Maull Shoal Light is a lighthouse on the north side of the ship channel in Delaware Bay, off of Cumberland County, New Jersey on the East Coast of the United States, southwest of the mouth of the Maurice River.
Tarrytown Light, also known as Kingsland Point Light and Sleepy Hollow Light, is a sparkplug lighthouse on the east side of the Hudson River in Sleepy Hollow, New York, United States. It a conical steel structure erected in the 1880s. In 1979 it was listed on the National Register of Historic Places.
Old Orchard Shoal Light was a sparkplug lighthouse in lower New York Bay marking a large shoal area. It was destroyed by Hurricane Sandy on October 29, 2012.
The National Harbor of Refuge and Delaware Breakwater Historic District encompasses a series of seacoast breakwaters behind Cape Henlopen, Delaware, built between 1828 and 1898 to establish a shipping haven on a coastline that lacked safe harbors. The Harbor of Refuge is at the mouth of the Delaware Bay estuary where it opens into the Atlantic Ocean, at Lewes.
