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San Diego Entrance Range Rear (Shelter Island) Lighthouse

Iso Green 6s🇺🇸San Diego, USOperational

Location & Light Range

About San Diego Entrance Range Rear (Shelter Island) Lighthouse

This red skeletal tower with a white vertical stripe stands 15 meters tall on Shelter Island, marking the San Diego Entrance Range. Its focal height is 17 meters, and it emits an isophase green light on a 6-second cycle. The light has a geographic range of 12.4 nautical miles. A rectangular slatted daymark is attached to the structure. The site is open to the public, but the tower itself is closed.

Why it matters: This range light is essential for guiding vessels safely into San Diego Bay by providing precise alignment with the deep-water channel.

Light & Optic

Characteristic Signature
Iso Green 6s
Flash Type
Isophase
Light Color
Green
Interval
6s
Raw Code
Iso G 6s
Focal Height
17m
Geographic Range
12.4NM

Location

City
San Diego
Country
🇺🇸United States
Region
California
Sea Region
San Diego Bay, marking the San Diego Entrance Range
Latitude
32.7089°
Longitude
-117.2343°

References & Identifiers

Nearest Port
San Diego(2.2 km)
Admiralty No.
G3679.1
USCG No.
6-1505
ARLHS No.
USA-1440

Tower & Structure

Tower Height
15m
Tower Shape
skeletal
Tower Color
red with a white vertical stripe

Structure: A 15m square skeletal tower, painted red with a white vertical stripe, carrying a rectangular slatted daymark.

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify San Diego Entrance Range Rear (Shelter Island) Lighthouse at night?+
San Diego Entrance Range Rear (Shelter Island) displays the characteristic Iso Green 6s. 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 San Diego Entrance Range Rear (Shelter Island) Lighthouse guide vessels into?+
San Diego Entrance Range Rear (Shelter Island) Lighthouse assists vessels approaching 5 nearby ports. The closest is OCEAN BEACH at 2.6 NM to the NNW. Other ports served include National City (3.4 NM E), Coronado (3.7 NM ESE), San Diego (6.9 NM ESE), Spring Valley, San Diego (12.8 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is San Diego Entrance Range Rear (Shelter Island) Lighthouse still active and maintained?+
Yes, San Diego Entrance Range Rear (Shelter Island) 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 San Diego Entrance Range Rear (Shelter Island) Lighthouse?+
San Diego Entrance Range Rear (Shelter Island) 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 San Diego Entrance Range Rear (Shelter Island) Lighthouse?+
You can track vessels near San Diego Entrance Range Rear (Shelter Island) 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.