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Daggerskjærgrunnen Lighthouse

Iso Green 4s🇳🇴Oslo, NOOperational

Location & Light Range

About Daggerskjærgrunnen Lighthouse

Also known as: #Daggerskjærgrunnen

This cylindrical stone tower, standing 6 meters tall, is located on a 6-meter round stone pier at the western tip of Bleikøy, near Oslo. Its focal height reaches 8 meters, and it emits an isophase green light every 4 seconds, visible for 9.7 nautical miles. Originally, a lantern sat atop the stone pier, but this structure has since been replaced. The current light operates on a mast, continuing the site's function as a navigational aid. The site itself is open to visitors, though the tower is closed.

Why it matters: Daggerskjærgrunnen marks the western extremity of Bleikøy, serving to warn vessels of potential underwater hazards.

Light & Optic

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

Construction & History

Significant events: Replaced

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
6m
Tower Shape
cylindrical
Material
stone

Structure: A 6m round stone pier with a lantern, which was later replaced. The current light is on a mast.

Location

City
Oslo
Country
🇳🇴Norway
Sea Region
Western tip of Bleikøy
Latitude
59.8876°
Longitude
10.7300°

References & Identifiers

Nearest Port
Oslo(0.8 km)
Admiralty No.
B2415
NGA No.
0493
ARLHS No.
NOR-378
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Frequently Asked Questions

How do mariners identify Daggerskjærgrunnen Lighthouse at night?+
Daggerskjærgrunnen displays the characteristic Iso 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 Daggerskjærgrunnen Lighthouse guide vessels into?+
Daggerskjærgrunnen Lighthouse assists vessels approaching 5 nearby ports. The closest is Oslo at 0.7 NM to the NNW. Other ports served include Sjursøja/Oslo (1.1 NM ESE), Lysaker (3 NM WNW), Snarøya (3.4 NM W), Steilene (5.6 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Daggerskjærgrunnen Lighthouse still active and maintained?+
Yes, Daggerskjærgrunnen 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 Daggerskjærgrunnen Lighthouse?+
Daggerskjærgrunnen 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 Daggerskjærgrunnen Lighthouse?+
You can track vessels near Daggerskjærgrunnen 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.