Mile Rocks Lighthouse
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| Location | near Golden Gate Bridge, California |
|---|---|
| Coordinates | 37°47′34″N 122°30′37″W / 37.792775°N 122.510369°W |
| Tower | |
| Constructed | 1906 |
| Foundation | Steel and Concrete |
| Construction | Steel |
| Automated | 1966 |
| Shape | Cylindrical |
| Power source | solar power  |
| Light | |
| First lit | 1906 |
| Focal height | 15 m (49 ft) |
| Lens | Third order Fresnel lens (removed) |
| Range | 15 nmi (28 km; 17 mi) |
| Characteristic | white flash every 5 s |
Mile Rocks Lighthouse is a lighthouse in California, United States, on a rock about 2 miles southwest of the Golden Gate Bridge, California
History
In 1889, the Lighthouse Service placed a bell buoy near the rocks. However, the strong currents in the area would pull the buoy beneath the surface of the water and set it adrift. The lighthouse was completed in 1906, and was built on a rock that was only 40 by 30 feet at high tide. The original third order Fresnel lens was transferred to Old Point Loma Lighthouse in San Diego. In 1966, all of the tower was removed and only the first story was left, and the light automated. The top of the first story is now a landing pad.
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