What the Kamakurazawa River No. 6 Sabo Dam Is
The Kamakurazawa River No. 6 Sabo Dam is a mortared stone check dam on the Kamakurazawa River in Yoshizato, Minamiuonuma City, Niigata Prefecture, completed in 1930 and entered on the national register as a Registered Tangible Cultural Property structure on 4 August 2015.
It is 29 meters long and 3.0 meters high. The No. 5 Sabo Dam lies about 40 meters below it and the No. 8 Sabo Dam about 40 meters above, the tightest spacing anywhere in the sequence, so the water surface steps down twice within a very short distance.
Mortared masonry, nerizumi in Japanese, means that the joints between the stones are packed with a bonding material so the wall acts as one body. The opposite is Karazumi, dry work in which the stones hold by interlocking alone. Sealing the joints raises the strength of a dam body, and the Kamakurazawa River No. 6 Sabo Dam is built that way.
The Dam That Makes the Staircase
Registration came under the criterion of contributing to the historic landscape of the country. The Council for Cultural Affairs recommended it on 13 March 2015 and the entry was made on 4 August that year, as registration number 15-0415.
The clearest statement of why that criterion applies appears in the national database entry for this particular dam. Placing dams and sills along the whole length of a torrent was an early undertaking in Japan, and along this straight reach a series of deliberately low dams produces a landscape of connected steps. The reason there are eight structures here, and the reason the eight were judged worth registering, are both set out in that sentence.
A single tall dam would create a wide bed of trapped sediment above it and change the valley entirely. Running a line of dams roughly three meters high keeps each drop small and leaves the shape of the stream much as it was. The Kamakurazawa River No. 6 Sabo Dam sits in the middle of that idea, forming one tread of the staircase along with its neighbours.
Walking the Closest-Spaced Reach
What is worth seeing here is less the individual dam than the relationship between it and the two nearest to it. With the No. 5 Sabo Dam 40 meters downstream and the No. 8 Sabo Dam 40 meters upstream, three structures occupy about 80 meters of valley, and from the right position two of them can be held in a single view. This is also the stretch where the sound of water falling over successive crests overlaps.
The dam body itself, 29 meters long and 3.0 meters high, is middling among the eight and close in size to its neighbours. Keeping the dimensions similar distributes the fall evenly between them, and the numbers record a decision not to let any one structure dominate.
The joints of the mortared face are narrow, and after rain the water darkens them so the outline of every stone lifts out of the wall. Overcast weather reads better than bright sun for this. Keep away, though, when the stream is running high.
Visiting the Kamakurazawa River No. 6 Sabo Dam
This is a working outdoor structure with no interior. Viewing is from the bank, without charge, with no reception and no restriction on photography.
Rather than standing square in front of it, drop back downstream and look for the spot where the No. 5 Sabo Dam comes into the same frame. Only with two dams in view does the word staircase mean anything on the ground. Carry on to the No. 8 Sabo Dam and the three-step run is complete.
Stay out of the streambed. Snow closes the valley in winter, so plan for roughly May to November. Directions and the parking situation are covered on the Kamakurazawa River Sabo Facilities page.
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Q&A
- Can the Kamakurazawa River No. 6 Sabo Dam be visited, and is there a charge?
- It can be seen from the bank at any time, free of charge. No car park or footpath has been laid out, so give some thought to where you leave a vehicle.
- What does the mortared masonry of the Kamakurazawa River No. 6 Sabo Dam mean?
- It means the joints between the stones are filled with a bonding material so the wall behaves as a single body. Dry masonry, which relies on interlocking alone, lets water through and is weaker as a dam.
- Why was the Kamakurazawa River No. 6 Sabo Dam registered?
- Under the criterion of contributing to the historic landscape of the country. The scheme was an early Japanese example of treating a whole torrent with dams and sills, and the low dams stepping up the straight channel create a distinctive landscape.
- What size is the Kamakurazawa River No. 6 Sabo Dam and when was it built?
- 29 meters long and 3.0 meters high, completed in 1930. It was registered as a Registered Tangible Cultural Property (structure) on 4 August 2015, under registration number 15-0415.
- Which other dams stand near the Kamakurazawa River No. 6 Sabo Dam?
- The No. 5 Sabo Dam 40 meters downstream and the No. 8 Sabo Dam 40 meters upstream. This is the most closely spaced part of the sequence and the best place to see the stepped arrangement.
Basic Information
| Name | Kamakurazawa River No. 6 Sabo Dam (鎌倉沢川第六号堰堤) |
|---|---|
| Location | Yoshizato, Minamiuonuma City, Niigata Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 2015/8/4 (Heisei 27) |
| Quantity | 1 site |
| Dimensions | 29 meters long, 3.0 meters high |
| Owner | Niigata Prefecture |
| Public Access | Working outdoor structure; exterior visible from the bank at any time, no interior access |
References
- National Cultural Properties Database: Kamakurazawa River No. 6 Sabo Dam (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00010580
- Sabo Facilities on the Kamakurazawa River Entered on the National Register (Niigata Prefecture, Minamiuonuma Regional Promotion Bureau)
- https://www.pref.niigata.lg.jp/sec/minamiuonuma_seibi/1356827806289.html
- Registered Cultural Properties of Minamiuonuma City (Minamiuonuma City Board of Education)
- https://www.city.minamiuonuma.niigata.jp/docs/890.html
Last verified: 2026.09.12
