Tone River System

0571-kawaji dam

It is the fourth tallest arch dam in Japan, and the catwalk can be visited. It is indeed a dam full of attractions. Of course, it is not only a sight to see, but it also works wonderfully and is an important base for protecting the downstream Kinugawa River. Protecting the Kinu River means protecting the urban areas downstream. We must not forget that. / Arch dam / 140m

Tochigi Prefecture Dam

0563-kawamata dam

Kawamata Dam is the longest vertical arch dam in Japan, tucked away in the midst of nature. It is also characterized by its compactness and various structures in a narrow space. The details here and there on the embankment are eye-catching. Also, since it is a long walk from the parking lot, it is a physical challenge to visit. / Arch dam / 117m

Tochigi Prefecture Dam

0578-Kuriyama Dam/Kuriyama Dam

Kuriyama Dam is a rockfill dam that functions as an upper reservoir for pumped-storage power generation with Imaichi Dam (0579-Imaichi Dam/Imaichi Dam) as a lower reservoir. The dam is interesting on the way to the dam, as it is visible after passing through a pasture, its gate, and a tunnel. It is recommended for driving, hiking, mountain climbing, etc. / Rockfill dam / 97.5m

Tochigi Prefecture Dam

0556-Kurobe Dam/Kurobe Dam

Kurobe Dam is located not in Toyama Prefecture but in Tochigi Prefecture. Japan's first concrete dam for power generation, built in the Taisho Era (1912-1926), is a stone-lined dam with style, elegance, and history. You can feel a little bit of Taisho Romanticism on your skin. There is also a hot spring nearby. / Gravity concrete dam / 28.7m

Tochigi Prefecture Dam

0558-dorobe dam

The Torobe Dam is owned by the Tokyo Electric Power Company and is dedicated to power generation. It can only be seen from the other side of the dam lake, and the embankment cannot be approached. Rumor has it that there is a path that leads to the embankment, but you will probably have to paddle through the bushes. If you take the wrong path, you will end up on the cliff, so it is safer not to go that far. / Gravity Concrete Dam / 21.6m

Tochigi Prefecture Dam

0588-Mikawasawa Dam

Mikawasawa Dam is a dam deep in the mountains that can only be reached on foot. Although it appears to be off-limits, we were able to enter this dam without any problems. Animals such as bears may appear, so we recommend that you bring a bell or other countermeasures when you visit. The best point of this dam is the embankment seen from the dam lake side. / Gravity concrete dam / 48.5m

Tochigi Prefecture Dam

0559- Ikari Dam/Ikari Dam

Gojuri" is the name of a place named after the distance of 50 ri from Tokyo's Nihonbashi Bridge, and the Gojuri Dam is a high dam, completed in 1956, with an embankment height of 112 meters. The construction of this dam has a long history. The history oozes from the embankment. It is a stately dam composed of the best mix of such history and modern technology, such as gate repair and cooperation with neighboring dams. / Gravity concrete dam / 112m

Tochigi Prefecture Dam

0560-Koami Dam

The Koami Dam is a small but fully enjoyable dam, owned by Tochigi Prefecture and dedicated to power generation. It also serves as a reverse control dam for the Kawaji No. 1 Power Station and as an intake dam for the Kawaji No. 2 Power Station and the Koami Power Station, and despite being dedicated to power generation, the top of the dam is unusual in that you can walk around it. / Gravity concrete dam / 23.5m

Tochigi Prefecture Dam

0557-Naka Iwadamu

This is the next dam we visited after Imaichi Dam (0579-Imaichi Dam), but we could not find it right away, even though we had checked in advance that it was along the R121 (Kinu Bypass). It was not easy to find it, although I had previously checked that it was located along the R121 (Kinu Bypass). However, it is located far from the national highway and a short walk is required. / Gravity arch dam / 26.3m

Tochigi Prefecture Dam

0579-Imaichi Dam/Imaichi Dam

Imaichi Dam is owned by the Tokyo Electric Power Company (TEPCO) and serves as a lower reservoir for pure pumped-storage power generation between it and the Kuriyama Dam (0578-Kuriyama Dam), which serves as the upper reservoir. The embankment gives a slender impression, and has an air of a dam that one would not expect from a dam dedicated to power generation. The atmosphere is quiet. No one is around, and no one comes. The only sound is the sound of water. This atmosphere is not bad. / Gravity concrete dam / 75.5m

Tochigi Prefecture Dam

Yunishigawa Dam construction site tour (2010/10/02)

I learned from the Dam Web Ring that the Japan Dam Association was going to hold a tour of the Yunishigawa Dam construction project, and after much deliberation, I went all the way there. I was surprised to learn that the development of science has shed a ray of hope on dam construction....

Off-line meeting/event report

0606-Aimata Dam

Despite the small size of the dam, the facilities are quite extensive. Of course, there are many things to see and do. National Route 17 runs along the side of the dam lake, which was also called Mikuni Kaido in the old days, and it is said that Kenshin Uesugi also passed through here. Nearby is Sarugakyo Onsen, which would be a good base for sightseeing and touring the dam. / Gravity Concrete Dam / 67m

0623-Naramata Dam

When that huge dike covers your field of vision, you are already in a world of amazement. How could such a man-made structure exist so deep in the mountains! Incidentally, the Tokuyama Dam was the largest embankment in Japan before it was completed. It is now the second largest, but it is so huge that it doesn't matter anymore. Compared to the Tokuyama Dam, where you cannot go directly under the embankment, the Naramata Dam is a more friendly dam. / Rockfill dam / 158m

0612-Yagisawa Dam

The Yagisawa Dam is an arch-type dam in the Okutone Dam Group, and it boasts of its gigantic size. It is the Yagisawa Dam. It is built in a secluded area of Okutone, and no one is allowed to enter beyond this point. / Arch / 131m

0602-Sudagai Dam

The Sudagai Dam is a power generation dam located at the junction of the Naramata Dam and the Yagisawa Dam. When the dam was completed in the Showa period (1926-1989), it was named Naramata Dam, but the upstream Naramata Dam changed only the letters in consideration of the existing Naramata Dam. But in the end, the Naramata Dam, which was the senior dam, changed its name to the Sudagai Dam because it sounded the same and was confusing. So it is a dam that loves its little brother. / Gravity Concrete / 72m

0605-Fujiwara Dam

Fujiwara Dam is the first high dam in the Okutone Dam complex. Although it has the use of power generation, it is not a stand-alone dam, but a pumped storage power generation dam with the upper dam, Tamahara Dam, and Fujiwara Dam is the lower dam. I saw this figure first from the downstream side, so I came straight to the downstream side. It is nice to be able to get a shot from the downstream side. / Gravity Concrete / 95m

0598-komori dam

The entire embankment is overflowing, and when the river is full of water, it creates a magnificent "sudare discharge" because of the natural overflow. It was lucky for us to see the discharge because there are days when the water volume is low and the dam does not discharge water. As you head upstream of the Tone River from this dam, high dams appear one after another, so it is recommended that you aim further upstream. / Gravity Concrete / 33m

0624-Yamba Dam

Entering Gunma from the Nagano Prefecture side, passing near Kusatsu Onsen, I had originally planned to go directly to the planned Yamba Dam construction site, but I noticed a public relations facility called the Yanbakan and made a hasty stop. The Yamba Dam has always been questioned as to whether it should be built or not, and even today it is a major issue that appears in newspaper articles, even in newspapers in the central part of Japan. / Gravity Concrete / 116m

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