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Storegrunnen Lighthouse

Oc White/Red/Green 6s🇳🇴Frogn, NOOperational

Location & Light Range

About Storegrunnen Lighthouse

Storegrunnen Lighthouse, located in Akershus, Norway, is situated on a shoal northwest of Drøbak in the Oslofjord. This active lighthouse features an octagonal fiberglass tower, standing 9 meters tall and rising to a focal height of 12 meters, centered on a hexagonal stone pier. Its light characteristics are an occulting white, red, or green flash every 6 seconds, visible for 11 nautical miles. The tower is painted white with two narrow black horizontal bands and a red top. Originally, an earlier structure likely incorporated a cast iron lantern, which has since been replaced. The site is open to visitors arriving by boat, but the tower itself is closed to the public.

Why it matters: This lighthouse is essential for guiding vessels through the Oslofjord, specifically warning them of the hazardous shoal it marks northwest of Drøbak. Its sector light provides precise navigation within this critical shipping lane.

Light & Optic

Characteristic Signature
Oc White/Red/Green 6s
Flash Type
Occulting
Light Color
White/Red/Green
Interval
6s
Raw Code
Oc WRG 6s
Focal Height
12m
Geographic Range
11NM

Construction & History

Significant events: Original cast iron lantern replaced

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9m
Tower Shape
octagonal
Tower Color
white with two narrow black horizontal bands and a red top
Material
stone, fiberglass

Structure: octagonal fiberglass tower centered on a hexagonal stone pier

Location

City
Frogn
Country
🇳🇴Norway
Region
Akershus
Sea Region
shoal in the Oslofjord, northwest of Drøbak
Latitude
59.7092°
Longitude
10.5891°

References & Identifiers

Nearest Port
Fagerstrand(1.4 km)
Admiralty No.
B2376
NGA No.
0404
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Frequently Asked Questions

How do mariners identify Storegrunnen Lighthouse at night?+
Storegrunnen displays the characteristic Oc White/Red/Green 6s. 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 Storegrunnen Lighthouse guide vessels into?+
Storegrunnen Lighthouse assists vessels approaching 5 nearby ports. The closest is Engene at 2.3 NM to the SW. Other ports served include Drøbak (3.1 NM SSE), GRAFFSTRANDA (4.4 NM NW), Bjørkås (5.2 NM NNW), Slemmestad (5.2 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Storegrunnen Lighthouse still active and maintained?+
Yes, Storegrunnen 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 Storegrunnen Lighthouse?+
Storegrunnen 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 Storegrunnen Lighthouse?+
You can track vessels near Storegrunnen 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.