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Miwa Dam, Ina

3.8
#5 of 11 in Parks in Ina
Dam · Hidden Gem · Nature / Park
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Miwa Dam is a dam in the Nagano Prefecture, Japan, completed in 1959.
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Miwa Dam reviews

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TripAdvisor traveler rating 4.0
7 reviews
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4.1
TripAdvisor
  • Picked as one of the top 100 Dams across Japan. Really a major feat of engineering, should be impressive for Dam-Lovers. The welcoming Front Entrance was beautiful with very mature cherry trees in... 
    Picked as one of the top 100 Dams across Japan. Really a major feat of engineering, should be impressive for Dam-Lovers. The welcoming Front Entrance was beautiful with very mature cherry trees in...  more »
Google
  • Great View
  • I participated in a dam tour held on November 6, 2021. It was a valuable tour to see the inside of the dam and the power plant. To tour the inside of the dam, go down about 300 steps, which are steep and long steps. It is said that the temperature inside is stable at around 12-16 degrees Celsius throughout the year. It seems to be lower at the base. I feel romance in the theory that the Mibu River is the source of the Tenryu River. It would be refreshing to say that the Kamaguchi Suimon of Lake Suwa, which collects the flow of the area including the foot of Mt. Yatsugatake, is the starting point of the Tenryu River, but it is not very tasty. There is no joy in finding the source. This Mibu River is a mysterious river that bends like a hairpin. (The end of the bend continues to the side of Mt. Senjogatake.) The bend is called "Omagari", and the end is a clear stream named Otomebuchi, which has a story as you can imagine. Many of you may know that it is National Highway No. 152, Bunkei Pass, and even Aokuzure Pass, but at the foot of the Southern Alps, there is the Median Tectonic Line, and the ground is reversed or soft. I have imagined that the hairpin-shaped channel is also the effect. Also, it seems that the reason why R152 is interrupted at Aokuzure Pass is due to the difficult area of ​​civil engineering work caused by the Median Tectonic Line. The Median Tectonic Line runs on the right bank side of the Mibu River where the Miwa Dam is constructed, and it is considerably softer than the solid ground on the left bank, so it is impermeable beyond the range actually filled with water. It is said that the wall has been extended by 122 meters. This 122m is in the ground and cannot be seen. I was a little excited to hear that there are things that play an important role in the invisible. In addition, because sediment is carried into the dam and accumulated due to the influence of soft ground, sediment bypass tunnels extending for about 4 km are installed at both the Koshibu Dam and Miwa Dam, which are tributaries of the Tenryu River at the foot of the same Southern Alps. increase. During the tour, I was able to observe the bypass tunnel exit and spout of Miwa Dam. When I entered the tunnel with a height of 8m and saw the concrete wall that had been cleaned by shaving water, I was overwhelmed by the human beings who pierced the mountain and made a huge structure and the natural power to shave the structure.

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