Alligator Reef Light is located 4 nautical miles east of Indian Key, near the Matecumbe Keys of Florida in the United States, north of Alligator Reef itself. The station was established in 1873. It was automated in 1963 and was last operational in July, 2014, and is being replaced by a 16' steel structure with a less powerful light located adjacent to it. The structure is an iron pile skeleton with a platform. The light is 136 feet (41 m) above the water. It is a white octagonal pyramid skeleton framework on black pile foundation, enclosing a square dwelling and a stair-cylinder. The lantern is black. The original lens was a first order bivalve Fresnel lens. The light characteristic of the original light was: flashing white and red, every third flash red, from SW by W 1/2 W through southward to NE 1/8 E, and from NE by E 3/4 E through northward to SW 3/8 S; flashing red throughout the intervening sectors; interval between flashes 5 seconds. It had a nominal range of 14 nautical miles in the white sectors and 11 nautical miles in the red sectors. The new light has a range of approximately 7 nautical miles.
Fowey Rocks Light is located seven miles southeast of Cape Florida on Key Biscayne. The lighthouse was completed in 1878, replacing the Cape Florida Light. It was automated on May 7, 1975, and as of 2021 is still in operation. The structure is cast iron, with a screw-pile foundation, a platform and a skeletal tower. The light is 110 feet above the water. The tower framework is painted brown, while the dwelling and enclosed circular stair to the lantern is painted white. The original lens was a first-order drum Fresnel lens which stood about 12 feet (4 m) high and weighed about a ton (tonne). The light has a nominal range of 15 miles in the white sectors, and 10 miles in the red sectors.
Carysfort Reef Light is located east of Key Largo, Florida. The lighthouse has an iron-pile foundation with a platform, and a skeletal, octagonal, pyramidal tower, which is painted red. The light was 100 feet (30 m) above the water. It was the oldest functioning lighthouse of its type in the United States until it was decommissioned in 2015, having been completed in 1852. The light last installed was a xenon flashtube beacon. It was added to the National Register of Historic Places in 1984.
Sombrero Key Light is located offshore of Vaca Key in Marathon, Florida. The lighthouse is located on a mostly submerged reef. The name Sombrero Key goes back to the Spanish, and old charts show a small island at the spot, but by the later 19th Century the island had eroded away, with some parts of the reef exposed at low tide. As a result, the reef and the lighthouse have also been called Dry Banks.
The unmanned reef lights of the Florida Keys were navigational aids erected near the Florida Keys between 1921 and 1935. They were intended to mark local hazards and did not need to be visible for as far as the reef lights that were erected near the Keys during the 19th century. By the time the lights in this list were erected, older lighthouses were being automated, and these new lights were designed to be automated from the start. The lights resembled the older reef lights in having a wrought iron skeletal pyramidal structure on a screw-pile foundation. They all originally had lanterns on their peaks, so that they looked like smaller versions of the older reef lights, but had no keeper's quarters.
The Robbins Reef Light Station is a sparkplug lighthouse located off Constable Hook in Bayonne, Hudson County, New Jersey, United States, along the west side of Main Channel, Upper New York Bay. The tower and integral keepers quarters were built in 1883. It replaced an octagonal granite tower built in 1839. The U.S. Coast Guard owned and operated the light station until the 2000s.
The Sturgeon Point Light Station is a lighthouse on Lake Huron in Haynes Township, Alcona County, northeastern lower Michigan. Established to ward mariners off a reef that extends 1.5 miles (2.4 km) lakeward from Sturgeon Point, it is today regarded as a historic example of a Cape Cod style Great Lakes lighthouse.
The Florida Reef is the only living coral barrier reef in the continental United States. It lies a few miles seaward of the Florida Keys, is about 4 miles wide and extends 270 km (170 mi) from Fowey Rocks just east of Soldier Key to just south of the Marquesas Keys. The barrier reef tract forms a great arc, concentric with the Florida Keys, with the northern end, in Biscayne National Park, oriented north-south and the western end, south of the Marquesas Keys, oriented east-west. The rest of the reef outside Biscayne National Park lies within John Pennekamp Coral Reef State Park and the Florida Keys National Marine Sanctuary. Isolated coral patch reefs occur northward from Biscayne National Park as far north as Stuart, in Martin County. Coral reefs are also found in Dry Tortugas National Park west of the Marquesas Keys. There are more than 6,000 individual reefs in the system. The reefs are 5,000 to 7,000 years old, having developed since sea levels rose following the Wisconsinan glaciation.
Eastern Dry Rocks is a coral reef located within the Florida Keys National Marine Sanctuary. It lies seven miles southeast of Key West and one mile east of Sand Key light within the Key West National Wildlife Refuge. This reef is within a Sanctuary Preservation Area (SPA).
Molasses Reef is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southeast of Key Largo, within the Key Largo Existing Management Area, which is immediately to the east of John Pennekamp Coral Reef State Park. This reef is within a Sanctuary Preservation Area (SPA).
Carysfort is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the east of Key Largo, within the Key Largo Existing Management Area, which is immediately to the east of John Pennekamp Coral Reef State Park. This reef is within a Sanctuary Preservation Area (SPA). The reef is northeast of The Elbow. The Carysfort Reef Light is near the center of the SPA.
French Reef is a coral reef located within the Florida Keys National Marine Sanctuary. It lies 11 km southeast of Key Largo, within the Key Largo Existing Management Area, which is immediately to the east of John Pennekamp Coral Reef State Park. French Reef is northeast of Molasses Reef. Part of the reef lies within a Sanctuary Preservation Area (SPA), which is 37 ha in area. A number of caves and arches in a spur and groove formation are included in the SPA.
Davis Reef is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southeast of Plantation Key. This reef lies within a Sanctuary Preservation Area (SPA).
Hen and Chickens is a shallow coral reef located within the Florida Keys National Marine Sanctuary. For a while in the 20th century it was marked by the Hen and Chickens Shoal Light. It lies to the southeast of Plantation Key. This reef lies within a Sanctuary Preservation Area (SPA).
Alligator Reef is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southeast of Upper Matecumbe Key. This reef lies within a Sanctuary Preservation Area (SPA).
Coffins Patch is a shallow coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southeast of Bamboo Key. This reef lies within a Sanctuary Preservation Area (SPA).
Rock Key is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southwest of Key West, within the Key West National Wildlife Refuge. This reef is within a Sanctuary Preservation Area (SPA).
Sand Key is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southwest of Key West within the Key West National Wildlife Refuge. This reef is within a Sanctuary Preservation Area (SPA).
9-foot Stake is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the south of Key West, and is west of Marker 32 reef. Unlike many reefs in the Sanctuary, it is not within a Sanctuary Preservation Area (SPA).
Marker 32 is a coral reef located within the Florida Keys National Marine Sanctuary. It lies to the south of Key West, and is between Western Sambo reef and 9-Foot Stake reef. Unlike many reefs in the Sanctuary, it is not within a Sanctuary Preservation Area (SPA).
