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Emms Rock Lighthouse

Fl Green 4s🇺🇸Jonesport, USOperational

Location & Light Range

About Emms Rock Lighthouse

Emms Rock light is a square stone tower standing 8 meters tall, with the light positioned at the same height. It is located off Kelly Point, about 5 kilometers east of Jonesport, Maine. The structure features a square skeletal mast atop the stone tower. This active light emits a green flash every 4 seconds and has a geographic range of 9.7 nautical miles. The site is open to visitors who can reach it by boat, but the tower itself remains closed to the public. The nearest port is Jonesport, 1.8 kilometers away.

Why it matters: Emms Rock is one of many 19th-century stone daybeacons along the Maine coast, representing an early navigational marking system. Its active light warns mariners of hazards near Kelly Point, serving as a critical aid for vessels transiting these waters east of Jonesport.

Light & Optic

Characteristic Signature
Fl Green 4s
Flash Type
Flashing
Light Color
Green
Interval
4s
Raw Code
Fl G 4s
Focal Height
8m
Geographic Range
9.7NM

Location

City
Jonesport
Country
🇺🇸United States
Region
Maine
Sea Region
Located off Kelly Point, approximately 5 km east of Jonesport, Maine.
Latitude
44.5290°
Longitude
-67.5658°

References & Identifiers

Nearest Port
Jonesport(1.8 km)
Admiralty No.
J0030
USCG No.
1-1305
ARLHS No.
USA-527

Tower & Structure

Tower Height
8m
Tower Shape
square
Material
stone

Structure: square skeletal mast on a square stone tower

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 Emms Rock Lighthouse at night?+
Emms Rock 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 Emms Rock Lighthouse guide vessels into?+
Emms Rock Lighthouse assists vessels approaching 5 nearby ports. The closest is Jonesport at 1.5 NM to the W. Other ports served include Addison (6.9 NM WSW), Milbridge (13.4 NM W), East Machias (14.5 NM NNE), Cherryfield (15.6 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Emms Rock Lighthouse still active and maintained?+
Yes, Emms Rock 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 Emms Rock Lighthouse?+
You can track vessels near Emms Rock 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.