Alcatraz Island

Alcatraz Island

San Francisco Bay, California

This aerial photograph shows Alcatraz in the foreground with the Golden Gate Bridge in the distance.

1909 (station established 1854). Active; focal plane 214 ft (65 m); white flash every 5 s. 84 ft (25.5 m) octagonal pyramidal reinforced concrete tower, unpainted; DCB-24 aerobeacon (1977). The original 4th order Fresnel lens (1902, transferred from the earlier lighthouse) is in storage for future display. Fog horn (blast every 30 s when needed) in a white square building 175 yards (160 m) southeast of the lighthouse.

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