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Onogawa Wan Lighthouse

Fl Green 3s🇯🇵Onagawa, JPOperational

Location & Light Range

About Onogawa Wan Lighthouse

This white, cylindrical concrete tower stands 11 meters tall and was first lit in 1969. Its focal height is 14 meters, and it emits a green light with a characteristic of one flash every 3 seconds. The lighthouse is situated at the end of the east breakwater for the Onogawa Nuclear Power Plant, approximately 4 kilometers southeast of Megawa. It guides vessels into a harbor serving the nuclear facility and lies about 1.8 kilometers from Nonohama.

Why it matters: This lighthouse is essential for guiding ships into the harbor supporting the Onogawa Nuclear Power Plant, particularly as a reactor unit is scheduled to restart in 2024. It ensures safe passage for vessels navigating the breakwater.

Light & Optic

Characteristic Signature
Fl Green 3s
Flash Type
Flashing
Light Color
Green
Interval
3s
Raw Code
Fl G 3s
Focal Height
14m
Geographic Range
11.6NM

Construction & History

Year Built
1969

Significant events: Onogawa Nuclear Power Plant shut down safely following earthquake and was not damaged by tsunami; reactor unit scheduled to restart in 2024

References & Identifiers

Nearest Port
Nonohama(1.8 km)
Admiralty No.
M6549.8
NGA No.
4334

Tower & Structure

Tower Height
11m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower

Location

City
Onagawa
Country
🇯🇵Japan
Region
Miyagi Prefecture
Sea Region
Located at the end of the east breakwater of the power plant, about 4 km southeast of Megawa. This harbor serves the Onogawa Nuclear Power Plant.
Latitude
38.4046°
Longitude
141.5059°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Onogawa Wan Lighthouse at night?+
Onogawa Wan displays the characteristic Fl Green 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Onogawa Wan Lighthouse guide vessels into?+
Onogawa Wan Lighthouse assists vessels approaching 5 nearby ports. The closest is Onagawa at 3.2 NM to the NW. Other ports served include Oginohama (3.3 NM WSW), Akehama (3.8 NM NW), Hamaguri (3.8 NM NW), Nonohama (3.8 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Onogawa Wan Lighthouse still active and maintained?+
Yes, Onogawa Wan 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 Onogawa Wan Lighthouse?+
Onogawa Wan 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 Onogawa Wan Lighthouse?+
You can track vessels near Onogawa Wan 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.