A Sabo Dam of 1928 Near the Source of the Kaname River
The Hachidan Dam (八段堰堤, Hachidan Entei) is a gravity-type erosion-control (sabo) dam built in 1928 on the 南沢 stream of the Kaname River system at Oyama, Isehara City, Kanagawa Prefecture, and was registered as a Registered Tangible Cultural Property (structure) on July 23, 2004 (Agency for Cultural Affairs).
The Agency for Cultural Affairs records a gravity concrete dam 37 metres long and 11 metres high; registration number 14-0087, owned by Kanagawa Prefecture.
A Key Sabo Work Near the River's Source
According to the Agency for Cultural Affairs, the Hachidan Dam is a key mountain-stream sabo work placed near the source of the Kaname River. Downstream stands the Motodaki Dam of 1930, registered on the same day.
Kanagawa Prefecture lists 8 sabo dams in the prefecture registered as historic sabo facilities, with the Hachidan Dam as the first entry.
Why It Was Registered
The Hachidan Dam was registered as a structure that contributes to the historic landscape of the country. The Agency for Cultural Affairs describes a large gravity dam of mortared masonry founded on tuffaceous bedrock.
What to Look For
It is 37 metres long and 11 metres high, with a downstream face sloping at 2 bu and an upstream face at 5 bu (Agency for Cultural Affairs).
The face is laid in tanizumi, with stones set diagonally, and the front elevation is almost symmetrical (Agency for Cultural Affairs).
Visiting
The Hachidan Dam is a sabo work on a mountain stream in the Oyama hills, and no official information on how to visit has been found. It falls under the sabo section of Kanagawa Prefecture's land development bureau.
The location is Oyama, Isehara City (Agency for Cultural Affairs).
Q&A
- When was the Hachidan Dam built?
- In 1928 (Agency for Cultural Affairs).
- How is 八段堰堤 read?
- Hachidan Entei (Agency for Cultural Affairs).
- How large is it?
- 37 metres long and 11 metres high (Agency for Cultural Affairs).
- Are there other registered dams nearby?
- Yes, the Motodaki Dam of 1930 stands downstream and was registered on the same day (Agency for Cultural Affairs).
- When was it registered?
- On July 23, 2004.
Basic Information
| Name | Hachidan Dam (八段堰堤) |
|---|---|
| Location | Oyama, Isehara City, Kanagawa Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 2004/07/23 (Heisei 16) |
| Quantity | 1 structure |
| Dimensions | Gravity concrete dam, 37 metres long, 11 metres high |
| Owner | Kanagawa Prefecture |
| Public Access | No visiting information (mountain sabo facility) |
References
- Hachidan Dam (Database of National Cultural Properties, Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00004218
- Motodaki Dam (Database of National Cultural Properties, Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00004219
- Historic sabo facilities in Kanagawa (Kanagawa Prefecture, Japanese)
- https://www.pref.kanagawa.jp/docs/jy2/cnt/f420226/p27240.html
Last verified: 2026.10.14