Mile Rocks Lighthouse
Mile Rocks Lighthouse with helicopter landing on the top
|Location||offshore Lands End|
|Year first constructed||1906 (first)|
|Year first lit||1966 (current rebuilt)|
|Foundation||massive reinforced concrete enclosed with steel plates basement|
|Tower shape||cylindrical tower with aerobeacon and helipad on the top (current)|
3-stage cylindrical tower with balcony and lantern (first)
|Markings / pattern||white and red horizontal bands tower (current)|
|Focal height||49 feet (15 m)|
|Original lens||3rd order Fresnel lens|
|Light source||solar power|
|Range||15 nautical mile|
|Characteristic||Fl W 5s.|
|Fog signal||blast every 30s. continuously|
|Managing agent||United States Coast Guard |
Mile Rocks Lighthouse is located on a rock about 1 mile (1.6 km) southwest of the Golden Gate Bridge, off of Lands End in San Francisco, California. It was completed in 1906, replacing a nearby bell buoy. In 1966, the light was automated, and the original 85 m (279 ft) tower of the lighthouse was demolished and replaced by a helipad. The lighthouse was at one time painted with alternating red and white rings, but as of 2017[update], the lighthouse is painted plain white.
On February 22, 1901, the SS City of Rio de Janeiro wrecked on the rocks, which prompted the lighthouse to be built. One hundred and twenty-eight persons, of 209 aboard, lost their lives when the ship sank.
The lighthouse was constructed by contractor James McMahon who hired sailors from San Francisco after his original crew refused to work in the dangerous conditions. Mile Rocks Lighthouse was finished in 1906 after considerable difficulty caused by the heavy seas and strong currents near the site.
The rock upon which the lighthouse is built measures only 40 by 30 feet (12.2 by 9.1 m) at high water. The base of the tower is a large block of concrete protected by steel plating. Steel and concrete in the foundation weigh 1500 tons. The superstructure is made of steel and houses the fog signal apparatus and the quarters for the former keepers.
In 1966, the light was automated and the tower was removed, leaving only foundation and the first story. The top of the first story was modified to support a helipad for the US Coast Guard. The original third order Fresnel lens was transferred to the Old Point Loma Lighthouse in San Diego.
- Mile Rocks The Lighthouse Directory. University of North Carolina at Chapel Hill. Retrieved 11 June 2016
- California Historic Light Station Information & Photography United States Coast Guard. Retrieved 11 June 2016
- Miles Rock Light Lighthouse Friends. Retrieved 11 June 2016
- "Mile Rocks: A Bay Area Lighthouse Unlike Any Other". KQED. 18 January 2019. Retrieved 20 January 2019.
- "Historic Light Station Information and Photography: California". United States Coast Guard Historian's Office. Archived from the original on 2017-05-01.
- U.S. Geological Survey Geographic Names Information System: Mile Rock Lighthouse
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