Alcatraz North Fog Signal Lighthouse
Location & Light Range
About Alcatraz North Fog Signal Lighthouse
The Alcatraz North Fog Signal, built in 1900, is a single-story structure on the northwest end of Alcatraz Island. Painted white, the building is illuminated after dark. Initially equipped with a fog bell, it was updated to a siren in 1913, and subsequently fitted with a horn to enhance sound projection. The facility, which remains active, provides foghorn signals to alert mariners to the island's presence. It is situated 1.4 km from San Francisco.
Why it matters: This signal serves as a navigation aid for vessels entering San Francisco Bay, particularly on the island's northwest side when visibility is poor. Its consistent function assists in preventing collisions with the island.
Tower & Structure
- Tower Color
- white and floodlit at night
Structure: A 1-story building, painted white and floodlit at night.
Location
- City
- San Francisco
- Country
- 🇺🇸United States
- Region
- California
- Sea Region
- northwestern tip of Alcatraz island
- Latitude
- 37.8281°
- Longitude
- -122.4256°
Nearby Vessels
Construction & History
- Year Built
- 1900
Significant events: The fog bell was replaced by a siren in 1913, later replaced by a horn.
References & Identifiers
- Nearest Port
- San Francisco(1.4 km)
- Admiralty No.
- G4084
- USCG No.
- 6-4325
- ARLHS No.
- USA-908
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