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Alcatraz Island Lighthouse
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Alcatraz Island Lighthouse,
San Francisco, CA
*Dates of operation~~ 1909-present
*Building Material~~ Reinforced concrete
*Tower~~ 84 feet
*Elevation~~ 135 feet above sea level
*Markings~~ Natural w/ black lantern
*Light Pattern~~ White flash every 5 seconds
*Existing Buildings~~ Only a few of the federal penitentiary buildings are left and standing.
*Automated~~ 1963
*Original Lens~~ Third Order Fresnel
*Current Lens~~ DCB-24
*Open to Public?~~ Yes
*Current Owner~~ U. S. Coast Guard owns tower, National Park Service owns grounds as
Golden Gate National Recreation Area
*Waterway Location~~ San Francisco Bay
*Significant Feature~~ Original 1854 tower was very first West Coast light. Damaged by
the Great San Francisco earthquake in 1906, it was dismantled in 1909 in favor of new
tower as part of new military prison, later to become a Federal Penitentiary.   

LINKS
Official National Park Site
http://www.nps.gov/alcatraz

Lighthouse info
http://gocalifornia.about.com/cs/calighthouse/a/lh_alc.htm

Lighthouse Friends lighthouse info and history
http://www.lighthousefriends.com/light.asp?ID=74
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