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This is a list of the tallest lighthouses, by tower height (as opposed to focal height, i.e. height of the lamp of a lighthouse from water level).The list includes only "traditional lighthouses", as defined by The Lighthouse Directory, i.e. buildings built by navigation safety authorities primarily as an aid to navigation. [1]
The height of the light above the chart datum for height (usually based on high water). e.g. 15m for 15 metres. The range in which the light is visible, e.g. "10M" for 10 nautical miles . An example of a complete light characteristic is "Gp Oc(3) W 10s 15m 10M".
Height Lighthouse State Reference 210 feet (64 m) Cape Hatteras Light: North Carolina [1]191 feet (58 m) Cape Charles Light: Virginia [2]175 feet (53 m)
The minimum height is calculated by trigonometry (see Distance to the horizon) as =, where H is the height above water in feet, and D is the distance from the lighthouse to the horizon in nautical miles, the lighthouse range.
The first lighthouse was a 51-foot (16 m) high tower established in 1806, which was replaced by the current 81-foot (25 m) conical tower and a second order Fresnel lens in 1869. The lighthouse was automated in 1978 and is still operational. The foundation is a granite pier and the construction material is granite. [4]
Butler Flats Light is a sparkplug lighthouse located in the outer harbor of New Bedford, Massachusetts, at the mouth of the Acushnet River. [2] [3] [4] Built in 1898 by the United States Lighthouse Board, it is the only known caisson lighthouse designed by a marine architect.