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Crotch Island Lighthouse

Fl Green 4s🇺🇸Isle au Haut, USOperational

Location & Light Range

About Crotch Island Lighthouse

The Crotch Island Lighthouse is a square, solid stone pyramid measuring 6 meters in height with a focal plane of 6 meters. Situated on Crotch Island near Allen Cove, it is located approximately 5.2 kilometers from Stonington, Maine. Originally a 19th-century unlit stone daybeacon, it was later fitted with a lamp. The light displays a green flash every four seconds, visible for 8.9 nautical miles. Access to the site is permitted, though the tower is not open for entry.

Why it matters: This navigation aid helps vessels traverse the intricate waters around Stonington and Allen Cove, indicating passages or dangers in this island-rich section of the Maine coast. It signifies the transition of navigational markers from passive structures to active illumination.

Light & Optic

Characteristic Signature
Fl Green 4s
Flash Type
Flashing
Light Color
Green
Interval
4s
Raw Code
Fl G 4s
Focal Height
6m
Geographic Range
8.9NM

Location

City
Isle au Haut
Country
🇺🇸United States
Region
Maine
Sea Region
Located opposite Allen Cove, about 1 km southwest of Stonington, on the coast of Maine.
Latitude
44.0647°
Longitude
-68.6514°

References & Identifiers

Nearest Port
Stonington(5.2 km)
Admiralty No.
J0072
USCG No.
1-3070
ARLHS No.
USA-221

Tower & Structure

Tower Height
6m
Tower Shape
square
Material
stone

Structure: square solid stone pyramid with a light on a short post at the apex

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 Crotch Island Lighthouse at night?+
Crotch Island displays the characteristic Fl Green 4s. 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 Crotch Island Lighthouse guide vessels into?+
Crotch Island Lighthouse assists vessels approaching 5 nearby ports. The closest is Matanuska at 10.1 NM to the ENE. Other ports served include NORTH HAVEN (10.2 NM WNW), Little Deer Isle (13.2 NM N), BERNARD (16.6 NM NE), Brooksville (17.1 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Crotch Island Lighthouse still active and maintained?+
Yes, Crotch 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.
How can I track vessels near Crotch Island Lighthouse?+
You can track vessels near Crotch 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.