A Dry-Stone Dam in the Kawaue Mountains
The Nigataki Daiichi Sabo Dam (二ヶ滝第一砂防堰堤, Nigataki Dai-ichi Sabō Entei) is a stone erosion control dam of 1949 built across a mountain stream in the Kawaue district of Nakatsugawa City, Gifu Prefecture, and it was entered on the national register as a Registered Tangible Cultural Property in 2006. It stands on Nigataki, a right-bank branch of the Shōgane valley, itself a tributary of the Nakatsu River in the southern part of the city.
Sabo dams are among the least celebrated structures in Japan and among the most necessary. Steep slopes, fractured granite and violent summer rain send gravel and boulders down these valleys at speeds that flatten anything in the way. A sabo dam does not hold water. It holds sediment, filling up behind itself until the streambed above has flattened out and the torrent loses its power to cut.
Why This One Was Registered
The dimensions are modest. The crest runs 26 metres, the structure stands 5 metres high, and it works on the gravity principle, resisting the load of sediment by its own mass alone. The upstream face is battered at five bu and the downstream face at four bu, meaning it leans back by half and by four tenths of a unit for every unit of height.
The interest lies in how the stone was laid. The faces are built in tanizumi, a coursing pattern in which squared blocks are set on the diagonal so the joints form a lattice of Xs rather than horizontal beds. More unusually, the dressed stone was laid dry. There is no mortar between the blocks. Water finds its way through the fabric instead of piling up behind an impermeable wall, and the whole structure holds together by friction and by the geometry of the cut.
Dry-laid dressed stone of this kind has almost no parallel among Japan's registered sabo works, and that scarcity is exactly what the register cited: the criterion applied was the one covering structures that would not be easy to reproduce. The knowledge is not in a drawing. It is in the hands of the masons who set each block, and those hands are gone.
Records held outside the national database put the start of construction in 1942 and completion in 1949, which would mean the work straddled the war years. The Agency for Cultural Affairs entry gives only the completion date of 1949, so the earlier figure is best treated as supplementary.
Visiting, and Being Realistic About It
This is not a museum. The dam remains in service under the Ministry of Land, Infrastructure, Transport and Tourism, which owns it, and there is no gate, no ticket, no interpretive panel and no car park at the structure itself. Anyone who wants to see it should treat the trip as mountain walking rather than sightseeing: forest tracks, uneven ground beside a live stream, and no mobile signal worth relying on.
The Kawaue district sits at around 700 metres above sea level and is reached from Nakatsugawa Interchange on the Chūō Expressway in roughly 35 minutes by car, or by Kitaena Kōtsū bus on the Yūmori line from Sakashita Station on the JR Chūō Line. Most visitors come for Yūmori Gorge and the Ryūjin Falls, which are properly signposted and easy to walk. Asking at the Nakatsugawa city tourism office or the local district office before setting out for the dam is a reasonable precaution, since forest roads in this area close after heavy rain and during snow.
Photography is unrestricted, the structure being an outdoor public work. Late autumn gives the best of it. The maples that draw crowds to Yūmori turn in the last days of October and through mid-November, and grey granite blocks under wet red leaves are a better sight than the same stone under summer glare.
Visitors who want the subject explained rather than merely seen might combine the trip with the Sabō Yūgakukan in Kaizu, at the other end of the prefecture, where two nationally designated sabo dams at Hanetani stand beside an exhibition centre with free admission and guided walks by appointment.
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Q&A
- Where exactly is the Nigataki Daiichi Sabo Dam?
- The Nigataki Daiichi Sabo Dam stands in the Kawaue district of Nakatsugawa City, Gifu Prefecture, on the Nigataki stream, a right-bank branch of the Shōgane valley in the Nakatsu River system. The area lies about 35 minutes by car from Nakatsugawa Interchange on the Chūō Expressway.
- Can the public visit the Nigataki Daiichi Sabo Dam, and is there an admission charge?
- The Nigataki Daiichi Sabo Dam is a working piece of infrastructure rather than a visitor attraction. There is no admission charge and no ticket office, but equally there is no path, signage or parking at the structure. Reaching it means walking forest tracks beside a live mountain stream, and forest roads in the area close after heavy rain and in winter.
- What makes the Nigataki Daiichi Sabo Dam architecturally unusual?
- The Nigataki Daiichi Sabo Dam is built of dressed stone laid dry, with no mortar in the joints, and its faces are coursed in the diagonal tanizumi pattern. That combination has few parallels anywhere in Japan among structures of this type, and it was the stated reason for registration.
- How large is the Nigataki Daiichi Sabo Dam?
- The Nigataki Daiichi Sabo Dam has a crest length of 26 metres and a height of 5 metres. It is a gravity structure, holding back sediment by its own weight, with the upstream face battered at five bu and the downstream face at four bu.
- When was the Nigataki Daiichi Sabo Dam built and registered?
- The Agency for Cultural Affairs records the Nigataki Daiichi Sabo Dam as dating from 1949, and it was registered as a Registered Tangible Cultural Property on 18 October 2006 under registration number 21-0104. Secondary sources give 1942 as the start of construction.
Basic Information
| Name | Nigataki Daiichi Sabo Dam (二ヶ滝第一砂防堰堤) |
|---|---|
| Location | Kawaue, Nakatsugawa City, Gifu Prefecture |
| Designation | Registered Tangible Cultural Property (structure), registration number 21-0104 |
| Year Designated | Registered 18 October 2006 |
| Quantity | 1 structure |
| Dimensions | Gravity-type stone dam, crest length 26 metres, height 5.0 metres; dated 1949 |
| Owner | The State (Ministry of Land, Infrastructure, Transport and Tourism) |
| Public Access | Working erosion control structure with no visitor facilities; exterior visible from the valley, approach on unmaintained forest tracks, no admission charge |
References
- National Cultural Properties Database, Agency for Cultural Affairs: Nigataki Daiichi Sabo Dam
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00005864
- Cultural Heritage Online: Nigataki Daiichi Sabo Dam
- https://bunka.nii.ac.jp/heritages/detail/190590
- Gifu Prefecture, Sabo Division: Registered Tangible Cultural Properties
- https://www.pref.gifu.lg.jp/shakai-kiban/kasen/sabo/11653/bunkazai.html
- Nakatsugawa City: Kawaue District Tourist Information
- https://www.city.nakatsugawa.lg.jp/soshikikarasagasu/kawaue/kanko/1333.html
Last verified: 2026.08.06