Yokotone Lock

Yokotone Lock is a navigation lock in Inashiki that joins two waterways at different levels through a controlled chamber system. Vessels pass through by entering the chamber where water levels are carefully adjusted to allow safe transit between the two sides.

The lock was constructed in 1921 as a major advancement in Japanese water management infrastructure during the early 20th century. It formed part of Japan's broader modernization of transportation systems in that period.

The lock stands as a testament to Japanese engineering skill and was designated a Cultural Property for its technical innovations. You can observe today how the structure serves the local maritime community and witness the careful coordination required for each passage.

You can watch the lock in operation from the riverbank when vessels pass through. The best viewing spots are located along the sides of the structure where you have a clear view of the entire operation from start to finish.

The structure still uses its original mechanical components from 1921 and continues operating daily for active maritime traffic. This decades-long continuity is remarkable as many locks worldwide have been modernized or replaced over time.

Location: Inashiki

Inception: March 31, 1921

GPS coordinates: 35.91183,140.49455

Latest update: December 10, 2025 20:07