What Is the Kuzuresawa Stone Chute?
The Kuzuresawa Stone Chute (クズレ沢斜路工, Kuzuresawa Sharokō) is a sabo work consisting of a stone-paved chute and a ground sill, built in the late Taisho era (the early 1920s) on the Kuzuresawa stream in Nishinoya, Myoko City, Niigata Prefecture, and registered as a Registered Tangible Cultural Property on July 1, 2003.
The Kuzuresawa is a small stream that joins the middle reach of the Hikagesawa, itself a tributary of the Bannai River, from the right bank. The Agency for Cultural Affairs database describes the structure as a stone-paved chute 12 meters long together with one stone ground sill.
The chute is a straight channel made by paving the hillside with stone at a gradient of 25%. Its sides slope at 1:1, and at its foot a ground sill with both faces battered at 1:0.3 is built as part of the same structure.
Why It Was Registered
It was registered as a structure contributing to the historic landscape of the country. The Agency for Cultural Affairs notes that the Kuzuresawa Stone Chute stabilizes the channel by building the chute and sill as one, and that it blends with the valley's scenery together with the vegetation that has grown back around it.
Niigata Prefecture calls the chute very rare, and the Japan Society of Civil Engineers nomination document likewise describes it as an unusual survival. The prefecture's page adds that it was found by chance.
What to Look For
The idea of a chute is to give water a ready-made stone path down an unstable gully so that it cannot carve one of its own. A 25% gradient drops 25 meters for every 100 meters of horizontal distance, and here the slope is paved for 12 meters into a straight channel.
The gentle 1:1 side slopes probably serve to gather the flow toward the center of the channel and keep the sides from being scoured. At the lower end, the ground sill catches the water coming down the chute and passes it on to the Hikagesawa. Building chute and sill as a single structure, rather than as separate pieces, is at the heart of the agency's assessment.
The stream's name, Kuzure, echoes the Japanese word for collapse, a fair hint at the nature of these slopes. The greenery that has returned to them is exactly the recovery the agency describes.
How to Visit
The Kuzuresawa Stone Chute lies on the Kuzuresawa, which enters the middle reach of the Hikagesawa from the right bank.
The prefecture says there is no road up the Hikagesawa even for maintenance, which makes it hard for its own staff to check the structures for damage, and it has been considering building one as far as the upper reach. No visitor path or signage could be confirmed. The ravine is steep, so do not try to scramble up to the Kuzuresawa Stone Chute; the photographs on the prefecture's website are the practical way to see it. Directions to Bannai River Sabo Park, and viewing conditions for the dams on the Bannai itself, are covered on the Bannai River Sabo Facilities page.
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Q&A
- What is the Kuzuresawa Stone Chute?
- A sabo work that combines a straight, stone-paved channel 12 meters long at a 25% gradient with one stone ground sill, built in the late Taisho era (the early 1920s).
- Why is the Kuzuresawa Stone Chute a Registered Tangible Cultural Property?
- It was registered on July 1, 2003, as a structure contributing to the historic landscape. Its chute and sill, built as one to stabilize the channel, and its harmony with the recovered greenery are cited.
- Is the Kuzuresawa Stone Chute rare?
- Both the prefecture and the Japan Society of Civil Engineers describe it as very rare. The prefecture's page says it was found by chance.
- Where is the Kuzuresawa Stone Chute?
- In Nishinoya, Myoko, on the Kuzuresawa, which joins the middle reach of the Hikagesawa, a tributary of the Bannai River, from the right bank.
- Can I visit the Kuzuresawa Stone Chute?
- No visitor path could be confirmed. The prefecture says there is not even a maintenance road up the Hikagesawa, so do not try to reach it; use the prefecture's website instead.
Basic Information
| Name | Kuzuresawa Stone Chute (クズレ沢斜路工) |
|---|---|
| Location | Nishinoya, Myoko City, Niigata Prefecture |
| Designation | Registered Tangible Cultural Property (Structure), Registration No. 15-0160 |
| Year Designated | Registered 2003/7/1 (Heisei 15) |
| Quantity | 1 structure (stone-paved chute and 1 stone ground sill) |
| Dimensions | Stone-paved chute 12 meters long (25% gradient), with 1 stone ground sill |
| Owner | Niigata Prefecture |
| Public Access | Outdoors, but no visitor route could be confirmed; the prefecture says there is not even a maintenance road up the Hikagesawa |
References
- Agency for Cultural Affairs, Database of National Cultural Properties: クズレ沢斜路工
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00003399
- Niigata Prefecture: Hikagesawa stone ground sills (Registered Tangible Cultural Properties)
- https://www.pref.niigata.lg.jp/sec/jouetsu_sabou/bunkazai-hikagesawa.html
- JSCE Kanto Branch: Bannai River sabo dams and Hikagesawa ground sills
- https://www.jsce.or.jp/branch/kanto/04_isan/h29/h29_8.html
Last verified: 2026.09.24
