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Alcatraz Island Light

 
Location: Alcatraz Island in San Fransisco Bay near San Francisco, CA
Source: USBeacons

Local Marine Forecast.

There are no active watches, warnings or advisories 

Latest Condiitions.

About Alcatraz Island Light

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The location of the light is Alcatraz Island in San Fransisco Bay. The nearest city is San Francisco, CA. The station was first established in 1854. The current lighthouse was first lit in 1909.

The lighthouse is a gray octagonal tower.

The tower has a flashing white light at a focal plane height of 214 ft above mean high water. The light has a nominal range of 20 nautical miles. The tower height is 84 ft. The light has a period of 5 seconds.

Open to the Public?: Grounds Only    Active?: Yes

Identification number: 6-4315 (U.S.)

Alcatraz Island Lighthouse is the first lighthouse built on the U.S. West Coast.

Emergency light of lower intensity when main light is extinguished.

A 'flashing' light is a light in which the total duration of light in a period is shorter than the total duration of darkness and the appearances of light (flashes) are usually of equal duration. So in the 5 second period, the light is on for less than 2.5 then off for more than 2.5.

Alcatraz Island Light was listed on the National Register of Historic Places on June 23, 1976, reference number 76000209.

Source: USBeacons
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