Nagaobashi Bridge is a beautiful stone arch bridge spanning the Nagaogawa River in Minamiboso City, Chiba Prefecture. Affectionately known as “Megane Bridge,” or “Glasses Bridge,” because of its distinctive shape, it is one of the rare three-arch stone bridges in Japan and is considered the only example of its kind in the Kanto region.
The name Nagaobashi was originally written on the bridge’s entrance pillars in both hiragana and kanji as “ながをばし.” However, parts of the inscription were damaged by years of exposure to wind and rain. During restoration work in 1993, the missing kanji were reconstructed based on historical evidence as “眺尾橋.”
The nickname “Megane Bridge” comes from the bridge’s distinctive three-arch shape, which resembles a pair of glasses. When the bridge was designated as a Chiba Prefectural Tangible Cultural Property in 1989, “Megane Bridge” was also adopted as part of its official designation.
Nagaobashi Bridge features a rare three-arch stone construction. This unusual design gives the bridge considerable historical and architectural value.
The stone used for the main structure is known as Mizurume Stone, which was quarried at the nearby Mizurume stone quarry. The bridge therefore represents not only traditional engineering techniques but also the use of locally available materials.
Nagaobashi Bridge was constructed in March 1888, during the Meiji period. Local stonemasons were responsible for its design and construction, while the total construction cost of 399 yen and 40 sen was covered through donations from local residents.
Izu Stone was used around the ends of the bridge, while Mizurume Stone was used for the main structure. The bridge was therefore built using resources available in the local area.
The bridge has survived numerous natural disasters throughout its long history, including the major flood of the Nagaogawa River in 1917 and the Great Kanto Earthquake of 1923.
During World War II, Japanese military tanks also crossed the bridge, providing further evidence of its exceptionally sturdy construction.
In 1978, Shirahama Town, now part of Minamiboso City, designated Nagaobashi Bridge as a Town Tangible Cultural Property.
In 1989, it was designated as a Chiba Prefectural Tangible Cultural Property. From 1993, the bridge underwent a two-year restoration project, during which the surrounding area was also improved. These efforts helped reestablish the bridge as an important symbol of the local community.
In addition, Nagaobashi Bridge was recognized in 2005 as a Civil Engineering Heritage by the Japan Society of Civil Engineers.
Nagaobashi Bridge is a source of pride for local residents and an important tourism resource in Minamiboso. Its elegant stone arches attract visitors and make it a popular spot for photography and sightseeing.
The area around the bridge has been developed for tourism and community activities. Local festivals, cultural events, and tourism campaigns make use of the bridge as a distinctive backdrop, helping promote the history and character of the region.
Nagaobashi Bridge is located in Takiguchi, Shirahama Town, Minamiboso City, Chiba Prefecture.
The bridge can be reached by both public transportation and car. Various sightseeing attractions can also be found nearby. Visitors are advised to check the latest local transportation and access information before their trip.
Nagaobashi Bridge, also known as Megane Bridge, is a rare three-arch stone bridge that combines historical significance with distinctive beauty. Carefully preserved as an important local landmark, it continues to be appreciated by both residents and visitors.
Having survived floods, earthquakes, and more than a century of history, the bridge offers a fascinating glimpse into the engineering techniques and community spirit of the Meiji period. When visiting Minamiboso City, be sure to take time to admire the elegant arches and historic atmosphere of Nagaobashi Bridge.