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Gloucester Lighthouse

Occ R 4s🇺🇸Northern Massachusetts, USOperational

Location & Light Range

About Gloucester Lighthouse

Also known as: Dog Bar Breakwater Light

The Gloucester Lighthouse, situated in Northern Massachusetts, features a red tower that rises 13.7 meters. Its focal height reaches 13.5 meters, casting a red light. The light characteristic is occulting, meaning it will briefly disappear from view. This light has a geographic range of 6 nautical miles. The lighthouse remains operational.

Light & Optic

Characteristic Signature
Occ R 4s
Flash Type
Occ
Light Color
Red
Flash Count
1 flash
Interval
4s
Raw Code
Oc
Focal Height
13.5m
Geographic Range
6NM

Location

City
Northern Massachusetts
Country
🇺🇸US
Latitude
42.5825°
Longitude
-70.6724°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
13.7m
Tower Color
red

References & Identifiers

Admiralty No.
LLNR 9855
OpenStreetMap
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Frequently Asked Questions

How do mariners identify Gloucester Lighthouse at night?+
Gloucester displays the characteristic Occ R 4s — 1 red flash every 4 seconds. 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Gloucester Lighthouse guide vessels into?+
Gloucester Lighthouse assists vessels approaching 5 nearby ports. The closest is Gloucester at 1.1 NM to the NNE. Other ports served include LONG WHARF CAUSEWAY (3.7 NM NNW), Annisquam Harbour (4.1 NM N), South Hamilton (8.7 NM W), IPSWICH BAY (9.3 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Gloucester Lighthouse still active and maintained?+
Yes, Gloucester 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.
How can I track vessels near Gloucester Lighthouse?+
You can track vessels near Gloucester 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.