3-568: Great Beds Light is a sparkplug lighthouse in Raritan Bay , about 1 mile (1.6 km) from South Amboy of Middlesex County , New Jersey , United States. Over the years the lighthouse has become the symbol for the city of South Amboy. Named as Great Beds Light Station , it was added to the National Register of Historic Places on May 29, 2008, for its significance in architecture, engineering, transportation, and maritime history. The light
6-485: Is a type of lighthouse whose superstructure rests on a concrete or metal caisson . Caisson lighthouses were developed in the late nineteenth century as a cheaper alternative to screwpile lighthouses . The caisson design was also more efficient as it could better withstand harsh weather, and was not as fragile. Caisson lighthouses usually have living quarters made of cast iron , although some brick examples are known. The two American nicknames were later coined because of
9-472: Was built in 1880 with a fourth order Fresnel lens to mark the Great Beds Shoal, hazardous shallow water in the Raritan Bay . The 30-foot (9.1 m) foundation, a conical caisson , sits in about 11 feet (3.4 m) of water. The five-story tower and lantern are 47 feet (14 m) high. Sparkplug lighthouse A caisson lighthouse (also referred to as a sparkplug lighthouse , or bug light )
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