Saruhashi Bridge

Overview

Saruhashi Bridge is a wooden bridge spanning the Katsuragawa River in Otsuki City, Yamanashi Prefecture, and is designated as a Place of Scenic Beauty. Its unique structure, featuring no supporting piers and instead relying on cantilever beams (hanegi) extending from the cliffs on both banks, is a striking feature. With a history of approximately 1400 years, Saruhashi was known as one of the 'Three Curious Bridges of Japan' during the Edo period. Saruhashi's unique design was made possible by the specific geographical conditions of the site: steep cliffs on both sides of the Katsuragawa River narrowing the span and raising the banks. The narrow width eliminated the need for piers in the riverbed, and the height of the banks ensured the bridge remained above even high water levels. Building a bridge at this location meant avoiding the destructive forces of flooding. However, this required a specialized bridge-building technique to create a pierless structure. Saruhashi employs the cantilever method (hanegi-bashi). Holes are drilled into the bedrock on either bank, and cantilever beams are inserted at an angle, extending out into space. Additional beams are layered on top, supported by the lower beams, each extending slightly further than the one below. This process is repeated multiple times, creating a cantilevered structure reaching across the river. The upper structure and bridge deck are then built atop this framework. Saruhashi's design includes roofing over the angled beams and lateral supports to protect the wood from decay due to rain. This is considered one of the key reasons for its longevity. Beyond its unique structure, Saruhashi also boasts beautiful natural surroundings. Enjoy stunning cherry blossoms in spring and vibrant autumn foliage. The area surrounding the bridge also offers attractions like Saruhashi Park and a local history museum, allowing visitors to immerse themselves in history and nature. We highly recommend a visit!