The bridge was commissioned by a local merchant named Chutaro Hashiguchi to improve logistics for the local economy.
Construction took approximately seven months, utilizing stone blocks quarried from the surrounding volcanic terrain.
Despite its massive size and age, the bridge withstood the major 2016 Kumamoto earthquakes with only minor structural impacts.
The mortar-less, dry-stone masonry technique relies entirely on the precise shaping of stones and the pressure of the arch keystone.
Reidaikyo Stone Bridge is a monumental single-arch stone bridge constructed in 1847 during the late Edo period. It spans the Midori River in the Misato town area of Kumamoto Prefecture. Measuring 24.9 meters in length and 6.3 meters in width, it holds the title of the largest stone arch bridge in Japan. The structure was built to facilitate the transport of charcoal and other goods from the mountainous regions to the plains. Its design utilizes the 'megane-bashi' (spectacles bridge) architectural style, characterized by a single massive semi-circular arch. The bridge was designated an Important Cultural Property of Japan in 1967. It remains functional and stands as a testament to the advanced masonry techniques employed during the 19th century.
The riverbank viewpoint located downstream, which captures the full reflection of the arch in the water.
The area is rugged; wear sturdy, closed-toe walking shoes to navigate the riverbank trails.
Visit the nearby observation platform to view the bridge's profile against the forested canyon backdrop.
Bring mosquito repellent during summer and early autumn months.
Do not attempt to climb or walk on the outer face of the arch, as the stones are historical and uneven.
Stay on marked paths to avoid damaging the historical stone embankments and riverbed ecosystem.
