Location: Yagisawa, Fujiwara, Minakami-machi, Tone-gun, Gunma
Date of interview: 2005/06/17
View of the levee from downstream
The Yagisawa Dam is an arch-type dam in the Okutone Dam complex, and it is also huge. It is the Yagisawa Dam. It is located in the unexplored region of Okutone, and no one is allowed to enter beyond this dam.
View of the flood discharge from downstream
Near the Sudagai Dam, there is an administrative road leading to the Yagisawa Dam. You can see a strange object on the bridge in front of the dam. Incidentally, the bridge in front of the dam is said to be a dormitory where people from the Japan Water Agency stay during wintering.
View of the flood discharge from downstream (close-up)
This is a ski jump flood discharge, which is very famous in the dam world. I have seen many dams, but this was the first time for me to see a flood discharge up close and personal.
View of the flood discharge from downstream (even closer close-up)
The flood discharge is used as a road, and the water is discharged from this tunnel from May to July. I have only seen it in videos and photos, but is it good? Is it safe? I have only seen it in videos and photos, but it is so dynamic that it makes me wonder if it is OK.
View of the control center and Nature View Yagisawa from the top of the Waki Dam
Still excited (even though we did not see any discharge of water), we arrived at the embankment. The signboard said that this was a "Waki-Dam," and that it was a rock-fill dam. In fact, the Yagisawa Dam is not an arch dam, but a combined arch and rockfill dam. Furthermore, there are wing dams on either side of the arch, the same as the Kurobe Dam. But officially, it is an arch.
From the top of the dam, you can see the administration office and the museum, Nature View Yagisawa.
View of the dam lake from the top of the Waki Dam
The monument, which appears to have been made of driftwood, is in good taste.
Inside Nature View Yagisawa
First, let's take a look inside Nature View Yagisawa. It was dark because the lights were not turned on, probably to conserve electricity, and it looked like it was about to start raining outside.
Bear! Bear! Bear!
A stuffed bear that looks as if it is about to move is on display. His dull eyes are impressive! By the way, his name is Yagisawa-kun (a lie).
View of the embankment on the lake side from the right bank
People tend to think that the dam is the front view from downstream, but in fact, this is the front view.
View of the ski-jump type force reducer from the top edge
If you go all the way down, you will reach the jumps mentioned earlier, but they are so far away that you cannot see the end of the road due to curves and such. The distance is about 500 meters.
View of the gate
The Yagisawa Dam has two roller gates. Incidentally, they are not really called flood discharges, but rather residual water discharges. This dam is also used for pumped-storage power generation with the Sudagai Dam on the TEPCO side, and it seems that a large amount of water from the dam lake is used for power generation.
View of the downstream bank from the right bank
Huge dams are difficult to photograph. They are too big to fit in the photo. Moreover, this picture is skewed.... Well, anyway, it is indeed very high. And it is quite curvy.
View of the top edge from the right bank
It's a really nice curve.
View of the dam lake from the top
No roads have been installed on the dammed lake, leaving it in its natural state. What lies ahead is truly an unexplored region.
View of the power plant from the top
I am thinking stupid things like, "It would be painful if I fell down. Incidentally, as a matter of course, this building is under the jurisdiction of the Tokyo Electric Power Company (TEPCO), not the Japan Water Agency (JWWA).
View of the nameplate and dam lake
This is definitely a photo point.
View downstream from the top
From here, the trail joins the jumps and soon becomes Lake Dogen, the dammed lake of the Sudagai Dam.
View of the embankment on the lake side of the dam from the left bank
No, the arch is really beautiful.
View of the gate from the top
It looks like it was taken from the dam lake.
Entrance to Yagisawa Dam Management Road
After leaving the Yagisawa Dam, I remembered that I had forgotten to take the entrance to the managed road, so I took this photo. Incidentally, from this point forward, the road is closed to ordinary vehicles during the winter. Please note that even if you come here in winter, you will not be able to see the Yagisawa Dam.
dam characteristics
| River Name | Tone River System Tone River |
|---|---|
| Objective | Flood control, agricultural disaster prevention, unspecified water, river maintenance water, and Irrigation water, water supply water, power generation |
| Model | arch |
| Bank height | 131m |
| Bank length | 352m |
| Dam volume | 510,000m3 |
| Watershed Area | 167.4 km2 |
| Reservoir area | 570ha |
| Total storage capacity | 204,300,000m3 |
| Effective water storage capacity | 175,800,000m3 |
| Dam operator | Kanto Jiken → Water Public Corporation One Construction |
| Main body constructor | Kumagai Gumi |
| Year of launch | 1959 |
| Year Completed | 1967. |
| Name of Dam Lake | Lake Okutone |
Other facilities/observations
It is definitely a dam you should visit. And I would love to see the discharge scene live.
| Parking lot | ○ |
|---|---|
| Toilet | ○ |
| Park | ○ |
| PR Exhibition Hall | ○ |
| Fishing | ○ |
Comment
[…] 好評を博した井上よしひさ先生の「ダムマンガ」の単行本の第2巻が本日発売となる。今回の表紙のダムは群馬県の薗原ダムだ。 今回も初版には特典として登場人物のデフォルメキャラが描かれた「ダム部女子カード」が封入！これはぜひともゲットしていただきたい！！ さらに今回も前回同様「とらのあな」「メロンブックス」「書泉」「喜久屋書店」「COMIC ZIN」「まんが王」の各書店では、それぞれ予約・購入する先着順で特典として描きおろしイラストカードが付くとのこと。各書店ごとでイラストが異なるらしいので、ぜひ井上先生のブログ「ポニー牧場のブログ」で詳細をチェックしてほしい。 さらにさらに5月17日に点検放流が行われる群馬県の矢木沢ダム・奈良俣ダムにて、ダムマンガ1巻＆2巻（初版、ダム部女子カードつき）を出張販売するとのこと。しかもここでも特典でオリジナル描きおろしイラストカードが付くとのこと。これはもう点検放流どころの騒ぎではない。（→ ソースはここ） […]