Alcatraz Island Lighthouse is a
lighthouse – the first one built on the U.S.
West Coast – located on
Alcatraz Island in
California's
San Francisco Bay. It the southern end of the island near the entrance to the prison. The first light house on the island was completed in 1854, and served the bay during its time as a
Citadel and military prison. It was replaced by a taller above mean sea level) concrete tower built in 1909 to the south of the original one which was demolished after it was damaged due to
earthquake in 1906. The automation of the lighthouse with a modern
beacon took place in 1963, the year Alcatraz closed as the
Alcatraz Federal Penitentiary. It is the oldest light station on the island with a modern beacon and is part of the museum on the island. Although when viewed from afar it easily looks the tallest structure on Alcatraz, it is actually shorter than the
Alcatraz Water Tower, but as it lies on higher ground it looks much taller.