St. Johns Light, Historic lighthouse in Duval County, US

St. Johns Light is an unpainted concrete lighthouse on Naval Station Mayport, marking the mouth of the St. Johns River near Jacksonville. Its octagonal tower, poured in one continuous operation in 1954, rises 64 feet (20 m) and carries a gallery and small lantern. The light shows four white flashes every 20 seconds with a range of 22 nautical miles, plus a red obstacle light.

The tower was built in 1954 and replaced a lightship that had been guiding vessels since 1929 at this location. This marked the fourth beacon structure in this spot, with lighting aids having stood at the river mouth since 1830.

The tower takes its name from the river it overlooks, serving as a recognizable landmark for those traveling the waterway. Its plain design reflects the practical needs of maritime traffic that has shaped this location for generations.

The lighthouse sits at the mouth of a major river and is visible from land, especially when traveling near Jacksonville. You get the best views from a boat trip or from a nearby vantage point overlooking the water.

The tower was poured in a single continuous concrete operation in 1954, so it has no joints between lifts. It never had a traditional lantern; an airway-beacon style light served until 1998, when a Vega VRB-25 system took over. The east wing was dedicated in 2014 to retired BMCM John G. Cathey of the Coast Guard CPOA.