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Marin County Lighthouses Lighthouse

Fl Green 5s🇺🇸Tiburon, USOperational

Location & Light Range

About Marin County Lighthouses Lighthouse

This lighthouse is situated on the southeastern point of Angel Island, approximately 4 miles northeast of the Golden Gate Bridge within San Francisco Bay. The current post structure, standing 3.5 meters tall, is adjacent to a 1-story former fog signal building. An earlier light was first established here in 1915. In 1961, the light was moved to the top of the fog signal building following the construction of a new Coast Guard station. The station was automated in 1971. It displays a green flash every 5 seconds, with a focal height of 18 meters, and has a geographic range of 12.7 nautical miles. The site is open to the public, though the tower itself is closed.

Why it matters: This light clearly marks the southeastern extremity of Angel Island, aiding vessels navigating the shipping lanes near the Golden Gate Bridge and around the island.

Light & Optic

Characteristic Signature
Fl Green 5s
Flash Type
Flashing
Light Color
Green
Interval
5s
Raw Code
Fl G 5s
Focal Height
18m
Geographic Range
12.7NM

Construction & History

Year Built
1961
First Lit
1915

Significant events: station established 1915, Coast Guard station constructed and light placed on fog signal building 1961, automated 1971

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
3.5m

Structure: post next to a 1-story former fog signal building

Location

City
Tiburon
Country
🇺🇸United States
Region
California
Sea Region
on the southeastern point of Angel Island, off Tiburon in San Francisco Bay about 4 miles (6.5 km) northeast of the Golden Gate Bridge
Latitude
37.8524°
Longitude
-122.4194°

References & Identifiers

Nearest Port
Tiburon(2.2 km)
Admiralty No.
G4119
USCG No.
6-4335
ARLHS No.
USA-617
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Frequently Asked Questions

How do mariners identify Marin County Lighthouses Lighthouse at night?+
Marin County Lighthouses displays the characteristic Fl Green 5s. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area. The green color may indicate a specific sector or warning zone.
Which ports and harbors does Marin County Lighthouses Lighthouse guide vessels into?+
Marin County Lighthouses Lighthouse assists vessels approaching 5 nearby ports. The closest is Tiburon at 2.1 NM to the NW. Other ports served include Sausalito (2.8 NM W), TREASURE ISLAND (2.9 NM SE), TRAVIS (2.9 NM WSW), Richmond (4.6 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Marin County Lighthouses Lighthouse still active and maintained?+
Yes, Marin County Lighthouses Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
What shipping routes pass near Marin County Lighthouses Lighthouse?+
Marin County Lighthouses Lighthouse is located within the US West Coast shipping lane — a major trans-Pacific trade route serving West Coast ports of the United States. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Marin County Lighthouses Lighthouse?+
You can track vessels near Marin County Lighthouses Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.