Nagahama Bridge

Nagahama Ohashi Bridge: Japan's Oldest Working Bascule Road Bridge

Stretching across the mouth of the Hijikawa River in the small port town of Nagahama in Ozu City, Ehime Prefecture, the Nagahama Ohashi Bridge is a striking vermilion-red steel bridge that has become a symbol of Japan's early modern engineering. Completed in August 1935, it is the oldest road bascule bridge still in operation in Japan and is the only road movable bridge to retain its original opening function from the time of construction. Locally known as "Akahashi" (the Red Bridge), it was designated an Important Cultural Property of Japan on December 10, 2014.

For visitors traveling along Ehime's scenic Iyonada coast, the bridge offers a rare opportunity to witness early twentieth-century engineering still performing its original task. The dramatic upward swing of its central span is a sight that draws photographers, engineers, and curious travelers from across the country and beyond.

Historical Background

The town of Nagahama developed during the Edo and Meiji periods as an important transshipment hub at the mouth of the Hijikawa River, the longest river in Ehime Prefecture. Timber, traditional wax (mokuro), and other goods carried downstream were transferred here onto coastal vessels bound for ports across the Seto Inland Sea, while everyday supplies traveled in the opposite direction back upriver. The town also flourished as a fishing port facing the Iyonada Sea.

For generations, residents on the eastern bank of the river were connected to those on the western bank only by ferry boats, with occasional temporary pontoon bridges. Building a permanent bridge had long been a community wish. In the early 1930s, Nagahama Town Mayor Nishimura Hyotaro (1884–1935) championed the project as a public works initiative aimed at supporting the local economy during a difficult period and at completing the prefectural road linking Nagahama to Iyo. Because the river still carried heavy boat traffic, an ordinary fixed bridge was unacceptable, and the unusual decision was made to build a movable bridge — an idea that was technologically pioneering for its time in Japan.

The bridge was designed by the Masuda Jun Office. Masuda Jun was one of Japan's foremost early bridge consultants, having studied advanced design techniques in the United States before returning home and producing a remarkable series of movable bridges across the country. Construction proceeded quickly, and the bridge opened in August 1935. Mayor Nishimura, whose political efforts had been essential to seeing the project through, sadly passed away only about one month after completion.

Why It Was Designated an Important Cultural Property

The Agency for Cultural Affairs identifies the Nagahama Ohashi Bridge as a heritage of exceptional importance in the history of Japanese bridge engineering. There are only three movable bridges in Japan that have been designated as cultural properties and remain in operating condition. Two are railway bridges, leaving the Nagahama Ohashi Bridge as the only road movable bridge among them, and the oldest still-operating example of its kind.

Three points are highlighted in its designation. First, it is the oldest existing road bascule bridge in Japan that has continuously retained its opening function from the time of construction. Second, it is a large-scale single-leaf bascule bridge designed by Masuda Jun applying the advanced engineering knowledge he gained in the United States, and built using cutting-edge construction methods of the early Showa era. Third, the steel pony Warren truss girders, the movable mechanism, and even the original electric drive system are largely preserved, allowing the bridge to be appreciated as a complete working artifact of 1930s civil engineering. For these reasons, the structure was first registered as a Tangible Cultural Property in 1998, recognized as a Modernization Industrial Heritage site in 2009, and finally designated an Important Cultural Property in 2014.

Engineering and Architectural Highlights

The bridge has a total length of 232.3 meters and a width of 6.6 meters. Its overall structure consists of five-span steel pony Warren truss girders on each side, flanked together with a single bascule (single-leaf) movable section located near the right bank. When opened, the central girder pivots upward through approximately 90 degrees to allow vessels to pass below, with an opening width of about 18 meters.

What is most remarkable from an engineering standpoint is the elegant economy of the design. An 82-ton counterweight set above the movable span balances the 54-ton girder, allowing the leaf to swing up smoothly with surprisingly little electrical power. Even today, despite the bridge being almost ninety years old, this counterweight system performs as it was designed to do. Visitors who attend a scheduled opening can observe the deliberate, almost ceremonial rise of the bright red span against the sky — a moving demonstration of pre-war Japanese craftsmanship.

Other distinctive features include the steel railings, ornamental newel posts, and side parapets, all of which are part of the official designation. Sharp-eyed visitors may even notice bullet marks left from a Grumman fighter strafing during World War II, a quiet reminder of the bridge's eventful past. The original electric drive mechanism, replaced in 2000 during refurbishment of the operator's room, is now preserved and exhibited at the nearby Nagahama Fureai Kaikan community center, also as a designated cultural property.

Visitor Information

The Nagahama Ohashi Bridge is freely accessible at any time as a working public road, and visitors are welcome to walk across it. To see the bridge in motion, however, the most reliable opportunity is one of the regular scheduled openings. According to the Ozu City Tourism Information, openings are typically held at 11:00 on Saturdays and public holidays, and around 11:24 and 13:00 on Sundays, excluding the year-end and New Year period. Schedules may change due to weather or maintenance, so visitors are encouraged to confirm the latest information with the Ozu City Tourism Association before their visit.

A small parking area is provided near the western end of the bridge, making access by car simple. From mid-summer through early autumn, the bridge is illuminated in the evenings (typically 19:00 to 21:00 from July to September), creating a romantic photo opportunity above the dark river. The bridge remains a working everyday road, so vehicles must observe width restrictions, and visitors are kindly asked to be mindful of local traffic and pedestrians while taking photographs.

Surrounding Attractions

The area around Nagahama offers far more than the bridge itself, and travelers are encouraged to plan a half-day or full-day visit to explore the wider region.

• Hijikawa Arashi Observation Park (Hijikawa Arashi Tenbo Koen) — A hilltop park overlooking the river mouth, the bridge, and the Seto Inland Sea. From October through March, on calm clear mornings, visitors can witness the famous "Hijikawa Arashi": a dramatic mass of cold mist that flows down the river and out to sea like a white dragon. It is also a renowned spot for sunsets.
• Iyo-Nagahama Station — A small station on the JR Yosan Line ("Iyonada Monogatari" sightseeing train route), about a 15-minute walk from the bridge through Nagahama's traditional shopping street.
• Eko Port and Sakamoto Ryoma sites — The river mouth area is connected to the story of the famous late-Edo-period samurai Sakamoto Ryoma, who came down the Hijikawa River after leaving Tosa Domain and stayed his last night in Shikoku in this town. Local volunteer guides offer interpretation tours.
• Ozu Castle Town — About a 25-minute drive upstream lies the city of Ozu, sometimes called the "Little Kyoto of Iyo," with its restored hilltop castle, Edo-era merchant houses, and the famous summertime cormorant fishing on the Hijikawa River.
• Yawatahama Minatto — A roadside seafood and tourism complex in nearby Yawatahama, ideal for fresh fish lunches and souvenirs.