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Jūsan Kō South Jetty Lighthouse

Fl Red 3s🇯🇵Goshogawara, JPOperational

Location & Light Range

About Jūsan Kō South Jetty Lighthouse

This red concrete post lighthouse stands 7 meters tall, with its focal height at 10 meters. It is attached to a square, single-story equipment shelter, with the entire structure painted red. The lighthouse is situated on a short jetty at the south side of the Mitoguchi inlet. This inlet connects Lake Jūsan, where the Iwaki River flows, to the sea. Its light emits a red flash every 3 seconds, visible for 10.4 nautical miles. The site is open to the public, though the tower is closed.

Why it matters: This lighthouse guides vessels through the Mitoguchi inlet, the only passage connecting Lake Jūsan to the sea, helping them navigate the river's outflow and coastal waters.

Light & Optic

Characteristic Signature
Fl Red 3s
Flash Type
Flashing
Light Color
Red
Interval
3s
Raw Code
Fl R 3s
Focal Height
10m
Geographic Range
10.4NM

Location

City
Goshogawara
Country
🇯🇵Japan
Region
Aomori Prefecture
Sea Region
Located on the short jetty on the south side of the Mitoguchi inlet, where the Iwaki River, the longest river of Aomori Prefecture, drains into a lagoon (Lake Jūsan) which is connected to the sea.
Latitude
41.0359°
Longitude
140.3219°

References & Identifiers

Nearest Port
Kodomari, Aomori(6.3 km)
Admiralty No.
M7048
NGA No.
3680
ARLHS No.
JPN-1064

Tower & Structure

Tower Height
7m
Tower Shape
post
Tower Color
red
Material
concrete

Structure: A 7m concrete post attached to a square 1-story concrete equipment shelter, painted entirely red.

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Jūsan Kō South Jetty Lighthouse at night?+
Jūsan Kō South Jetty displays the characteristic Fl Red 3s. 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Jūsan Kō South Jetty Lighthouse guide vessels into?+
Jūsan Kō South Jetty Lighthouse assists vessels approaching 5 nearby ports. The closest is Kodomari, Aomori at 6.1 NM to the N. Other ports served include Odomari (6.2 NM N), Minmaya (13 NM N), Otomi (15.8 NM NE), Ajigasawa (16 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Jūsan Kō South Jetty Lighthouse still active and maintained?+
Yes, Jūsan Kō South Jetty 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 Jūsan Kō South Jetty Lighthouse?+
Jūsan Kō South Jetty Lighthouse is located within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Jūsan Kō South Jetty Lighthouse?+
You can track vessels near Jūsan Kō South Jetty 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.