1858. Active; focal plane 151 ft (46 m); white flash every 20 s. 157 ft (48 m) early classic brick tower, solar-powered VRB-25 aerobeacon. Lower half of tower painted white, upper half and lantern black. 1-story brick keeper's house (1922), original kitchen, and other outbuildings preserved. The 2nd order bivalve Fresnel lens (1909) is on display at the Coast Guard Training Center in Yorktown, Virginia. The keeper's house is used as housing for park service personnel. Located on Loggerhead Key at the far western end of the Dry Tortugas. Accessible only by boat. Site open, tower closed.