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Blockhusudden Lighthouse

Fl (2) White/Red/Green 6s🇸🇪Stockholm, SEOperational

Location & Light Range

About Blockhusudden Lighthouse

Also known as: Blockhusudden (Djurgården)

The Blockhusudden lighthouse, established in 1905, is situated at the entrance to the Saltsjön, Stockholm's inner harbor, off the east end of Djurgården. It consists of a 7-meter round stone tower with a lantern and gallery, mounted on a stone pier. The focal height of the light is 6 meters, and it emits two white, red, or green flashes every 6 seconds, depending on the direction of approach. This system provides a geographic range of 8.9 nautical miles. The site is open to the public, though the tower itself is closed.

Why it matters: Blockhusudden is essential for guiding vessels into Stockholm's inner harbor, with its multi-colored light system marking safe channels.

Light & Optic

Characteristic Signature
Fl (2) White/Red/Green 6s
Flash Type
Flashing
Light Color
White/Red/Green
Flash Count
2 flashes
Interval
6s
Raw Code
Fl(2) WRG 6s
Focal Height
6m
Light Range
6NM (11.1 km)
Geographic Range
8.9NM

Construction & History

First Lit
1905

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
7m
Tower Shape
cylindrical
Tower Color
white
Material
stone

Structure: round stone tower with lantern and gallery, mounted on a round stone pier

Location

City
Stockholm
Country
🇸🇪Sweden
Region
Stockholm County
Sea Region
entrance to the Saltsjön, Stockholm's inner harbor, off the east end of Djurgården, a forested island east of downtown Stockholm
Latitude
59.3208°
Longitude
18.1548°

References & Identifiers

Nearest Port
Stockholm(0.8 km)
Admiralty No.
C6558
NGA No.
9556
Wikidata
Q10431416 →
OpenStreetMap
View on OSM →
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Frequently Asked Questions

How far offshore can Blockhusudden Lighthouse be seen?+
With a focal height of 6 meters and a nominal range of 6 nautical miles (approximately 11.1 km), Blockhusudden is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. As a shorter-range light, it primarily serves nearshore and coastal traffic.
How do mariners identify Blockhusudden Lighthouse at night?+
Blockhusudden displays the characteristic Fl (2) White/Red/Green 6s — 2 white/red/green flashes every 6 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. The white/red/green color may indicate a specific sector or warning zone.
Which ports and harbors does Blockhusudden Lighthouse guide vessels into?+
Blockhusudden Lighthouse assists vessels approaching 5 nearby ports. The closest is Bergs oljehamn at 0.4 NM to the SE. Other ports served include Loudden/Stockholm (3.3 NM WNW), Stockholm (3.3 NM WNW), Gustavsvik/Stockholm (4.5 NM E), Ballstaviken (6.1 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Blockhusudden Lighthouse still active and maintained?+
Yes, Blockhusudden 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.
What shipping routes pass near Blockhusudden Lighthouse?+
Blockhusudden Lighthouse is located within the Baltic Sea trade route — a vital shipping corridor for trade between Scandinavian, German, Polish, and Baltic state ports. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Blockhusudden Lighthouse?+
You can track vessels near Blockhusudden 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.