The Bridge at the Heart of the Trail
The Former JNR Miyanoharu Line Konogawa Bridge (旧国鉄宮原線幸野川橋梁, Kōnogawa Kyōryō) is a six-arch concrete railway viaduct in the Miyahara district of Oguni Town, Kumamoto Prefecture, completed around 1939 and registered as a Registered Tangible Cultural Property in 2004.
It carries the old trackbed across the Momiki River, a tributary system of the Chikugo, between the former Kitazato and Higo-Oguni stations. It is 116 metres long. The four central arches each span 20 metres, with a smaller 10-metre arch at either end, and no bridge left on the line has wider arches.
It also leaps a road and a strip of rice paddies, and sits roughly halfway along the walking path that follows the line. Anyone who walks the old railway crosses it.
Why Konogawa Matters
The registration criterion is contribution to the historic landscape of the country. The Agency for Cultural Affairs singles out the scale of those four big arches and the care taken over the spandrels, the walls between the arches, which are pierced with small semicircular openings.
A filled-spandrel bridge like this is solid concrete above the arch, and tends to look heavy and flat. On Konogawa the openings lighten that mass and set a second, smaller rhythm over the big one. The civil-engineering survey Doboku Isan in Kyushu reads them as a deliberate attempt to give a rural viaduct some grace, beyond anything the structure strictly needed.
Local tradition holds that bamboo, not steel, was laid inside the concrete, a technique known in Japanese as chikkin. The director of Mokkonkan, the exchange centre in Kitazato, points to photographs taken during construction and to the recollections of the site foreman. The Agency's description says nothing about bamboo, though, and no one can see inside the concrete. Treat it as a well-grounded local account rather than an established fact.
What to Look For
A flight of steps beside the bridge leads down to the foot of the piers. From there the four 20-metre arches march overhead and you get a proper sense of how tall the legs are.
Look up at the semicircular openings above each pier. They frame small windows of sky and cedar forest between the big arches. Step off to one side and view the Former JNR Miyanoharu Line Konogawa Bridge at an angle, and the openings stack up one behind another.
Back on the deck, the view opens across the paddies along the Momiki River. Between spring and autumn the grey concrete and green fields make the strongest contrast.
Visiting
The walking path runs straight across the deck, so you can walk over the bridge freely. There is no admission desk and no booking.
The closest starting point is Mokkonkan in Kitazato, which has parking and toilets; the walk to the bridge and back takes about forty minutes. You can also come from the Yu Station end, and the town publishes a map of a short loop around Konogawa.
Footing on the steps and under the arches is limited and can be slippery after rain. The town asks visitors to leave the trackbed once the light begins to fade.
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Q&A
- Is the Former JNR Miyanoharu Line Konogawa Bridge really reinforced with bamboo?
- It is locally known as a bamboo-reinforced bridge, and the director of Mokkonkan cites construction photographs and the foreman's own account. The Agency for Cultural Affairs does not mention bamboo, so the claim is not confirmed by official records.
- How do I get to the Former JNR Miyanoharu Line Konogawa Bridge?
- Park at Mokkonkan in Kitazato and follow the walking path; the round trip is about forty minutes. You can also walk in from Michi-no-Eki Oguni Yu Station.
- Can I see the Former JNR Miyanoharu Line Konogawa Bridge from below?
- Yes. Steps beside the bridge lead down to the base of the piers, where you can look straight up into the arches.
- Is there a fee to visit the Former JNR Miyanoharu Line Konogawa Bridge?
- No. The deck is part of the public walking path, but the town asks visitors to leave the old line before dark.
- How big is the Former JNR Miyanoharu Line Konogawa Bridge?
- It has six arches and is 116 metres long. The four central arches span 20 metres each and the two end arches 10 metres each.
Basic Information
| Name | Former JNR Miyanoharu Line Konogawa Bridge |
|---|---|
| Location | Aza Nishimura, Oaza Miyahara, Oguni Town, Aso District, Kumamoto Prefecture |
| Designation | Registered Tangible Cultural Property (Building) |
| Year Designated | Registered 2004/2/17 (Heisei 16) |
| Quantity | 1 structure |
| Dimensions | 6-span concrete arch bridge, 116 metres long |
| Owner | Oguni Town |
| Public Access | Exterior open at all times (walking path crosses the deck) |
References
- Database of National Cultural Properties: Former JNR Miyanoharu Line Konogawa Bridge (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00003925
- Cultural Heritage Online: Former JNR Miyanoharu Line Konogawa Bridge
- https://online.bunka.go.jp/heritages/detail/150535
- Former JNR Miyanoharu Line Walking (Oguni Town official tourism site)
- https://www.town.kumamoto-oguni.lg.jp/kankojyoho/kanko_taiken/20269
- Doboku Isan in Kyushu: Konogawa Bridge (Kyushu Regional Development Association)
- https://dobokuisan.qscpua2.com/heritage/kumamoto/kum13_kounogawa/
- Tracing the Miyanoharu Line in Oguni (Kumanichi Spice)
- https://spice.kumanichi.com/outing/outing-feature/131448/
Last verified: 2026.09.25
