Black Rock Lighthouse
Location & Light Range
About Black Rock Lighthouse
Black Rock Lighthouse, established in 1917, stands on a rock approximately 11 kilometers southeast of Mary Island Lighthouse. Its square skeletal tower, standing 9 meters tall, is painted in a red and white checkerboard pattern. This pattern also adorns diamond-shaped daymarks, providing a visual reference during daylight. At night, the lighthouse emits a single white flash every six seconds. The focal height of the light is 17 meters, with a geographic range of 12.4 nautical miles. The nearest port is Metlakatla, located 13.5 kilometers away. The site is open for visitors, though the tower itself remains closed.
Why it matters: This lighthouse warns mariners of the submerged rock it marks, a critical function for vessels navigating the Inland Passage.
Light & Optic
- Flash Type
- Flashing
- Light Color
- White
- Interval
- 6s
- Raw Code
- Fl W 6s
- Focal Height
- 17m
- Geographic Range
- 12.4NM
Construction & History
- First Lit
- 1917
Significant events: Station established 1917
Visiting
- Open to public
- Site open, tower closed
Nearby Vessels
Tower & Structure
- Tower Height
- 9m
- Tower Shape
- square
- Tower Color
- red and white checkerboard pattern
Structure: square skeletal tower carrying diamond-shaped daymarks colored in a red and white checkerboard pattern
Location
- Country
- 🇺🇸United States
- Region
- Alaska
- Sea Region
- Located on a rock about 11 km southeast of the Mary Island lighthouse, offering views from ships navigating the Inland Passage.
- Latitude
- 55.0990°
- Longitude
- -131.1832°
References & Identifiers
- Nearest Port
- Metlakatla(13.5 km)
- Admiralty No.
- G6004
- NGA No.
- 114-7388
- USCG No.
- 6-21930
- ARLHS No.
- ALK-009
- Wikidata
- Q28333663 →
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