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Rock Of Ages Lighthouse

Fl (2) W 10s🇨🇦Michigan's Western Upper Peninsula, CAOperational

Location & Light Range

About Rock Of Ages Lighthouse

Constructed in 1908, the Rock of Ages Lighthouse stands 36 meters tall on a small rock outcropping. Its white tower reaches a focal height of 40 meters, emitting a white light with a characteristic of single flashes. The lighthouse has a geographic range of 12 nautical miles. It is situated approximately 3.6 kilometers west of Washington Island and 5.6 kilometers west of Isle Royale. The outcropping itself measures about 15 by 61 meters.

Why it matters: This lighthouse is listed on the National Register of Historic Places.

Background
The Rock of Ages Light is a U.S. Coast Guard lighthouse on a small rock outcropping (50 by 200 feet (15 m × 61 m)) approximately 2.25 miles (3.62 km) west of Washington Island and 3.5 miles (5.6 km) west of Isle Royale, in Eagle Harbor Township, Keweenaw County, Michigan (see map below). It is an active aid to navigation.

Light & Optic

Characteristic Signature
Fl (2) W 10s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
10s
Raw Code
Fl
Focal Height
40m
Light Range
15NM (27.8 km)
Geographic Range
12NM

Construction & History

Year Built
1908
Heritage Status
National Register of Historic Places listed place

References & Identifiers

Admiralty No.
LLNR 16655
Wikipedia
Read on Wikipedia →
Wikidata
Q7354843 →
OpenStreetMap
View on OSM →

Tower & Structure

Tower Height
36m
Tower Color
white

Location

City
Michigan's Western Upper Peninsula
Country
🇨🇦CA
Latitude
47.8667°
Longitude
-89.3133°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How far offshore can Rock Of Ages Lighthouse be seen?+
With a focal height of 40 meters and a nominal range of 15 nautical miles (approximately 27.8 km), Rock Of Ages is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. Lights of this range are typically used as landfall lights by vessels approaching from the open sea.
How do mariners identify Rock Of Ages Lighthouse at night?+
Rock Of Ages displays the characteristic Fl (2) W 10s — 2 white flashes every 10 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.
Which ports and harbors does Rock Of Ages Lighthouse guide vessels into?+
Rock Of Ages Lighthouse assists vessels approaching 4 nearby ports. The closest is Grand Portage at 16.1 NM to the WNW. Other ports served include Fort William (32.2 NM N), Port Arthur (32.2 NM N), Thunder Bay (32.2 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Rock Of Ages Lighthouse still active and maintained?+
Yes, Rock Of Ages 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 Rock Of Ages Lighthouse?+
You can track vessels near Rock Of Ages 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.