The Spanish called the reef Cayo Sombrero. As part of the reef was above water at low tide, it was also called "Dry Bank".[3]
The Sombrero Key Light was built on the reef in 1858,[4] and continued in use until 2015.[3] The lighthouse tower is unsafe, and boaters are forbidden from tying up to the tower or climbing on it.[5]
^Love, Dean (1982). Reef Lights: Seaswept Lighthouses of the Florida Keys. Key West, Florida: The Historic Key West Preservation Board. p. 65. ISBN0-943528-03-8.