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Spire Island Reef Lighthouse

Fl Green 4s🇺🇸USOperational

Location & Light Range

About Spire Island Reef Lighthouse

A white, square, pyramidal concrete tower, 9 meters in height, stands on Spire Island Reef. This structure, with a focal height of 9 meters, emits a green flashing light every 4 seconds, visible for 10 nautical miles. It is situated on the west side of the Revillagigedo Channel, near the channel's northern extent. The lighthouse is built directly on a reef, with its nearest port being Ward, approximately 5.9 kilometers away. This navigational aid is one of several concrete pyramid structures found along this waterway.

Why it matters: This lighthouse marks the west side of the Revillagigedo Channel, a key passage, guiding vessels away from hazards near the channel's northern end.

Light & Optic

Characteristic Signature
Fl Green 4s
Flash Type
Flashing
Light Color
Green
Interval
4s
Raw Code
Fl G 4s
Focal Height
9m
Geographic Range
10NM

Location

Country
🇺🇸United States
Region
Alaska
Sea Region
Revillagigedo Channel, marking the west side of the channel near its north end.
Latitude
55.4460°
Longitude
-131.8815°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9m
Tower Shape
pyramidal
Tower Color
white
Material
concrete

Structure: A 9m square solid concrete pyramid, painted white.

References & Identifiers

Nearest Port
Ward(5.9 km)
Admiralty No.
G6028
USCG No.
6-21965
ARLHS No.
ALK-013
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Frequently Asked Questions

How do mariners identify Spire Island Reef Lighthouse at night?+
Spire Island Reef 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 Spire Island Reef Lighthouse guide vessels into?+
Spire Island Reef Lighthouse assists vessels approaching 5 nearby ports. The closest is Ketchikan at 8.8 NM to the SE. Other ports served include Annette Island (15.3 NM SE), Metlakatla (22.1 NM SSE), Neets Bay (22.4 NM NNE), Thorne Bay (24.8 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Spire Island Reef Lighthouse still active and maintained?+
Yes, Spire Island Reef 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 Spire Island Reef Lighthouse?+
You can track vessels near Spire Island Reef 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.