Nagano Prefecture Dam

1026-Nanakura Dam

Nagano Prefecture Dam
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Ironclad rockfill dam.

Location: Takaseiri, Oaza Taira, Omachi City, Nagano Prefecture

View of the levee from the downstream side of the left bank

Nanakura Dam is located further upstream from Omachi Dam. It is quite a large rock-fill dam, and you can get a sense of its size by looking up at it from directly below the embankment.

View of the levee from the downstream side of the left bank

View of flood discharge

Two roller gates can be seen. To the right of them is the administration building. There are stairs on the left side of the spillway that lead up to the embankment, but due to time constraints and the weather, we decided not to go up. It is not possible to go up to the top by car.

View of flood discharge

View of the levee from the downstream parking lot

A very large parking lot is located directly below the dike. Compare the size of the levee with that of a car.

View of the levee from the downstream parking lot

Entire water discharge channel

Entire water discharge channel

dam characteristics

Modelrockfill dam
Objectivegeneration (e.g. power)
Bank height125m
Bank length340m
Dam volume7,380,000m3
Watershed Area150km2
Reservoir area72ha
Total storage capacity32,500,000m3
Effective water storage capacity16,200,000m3
River NameShinano River System Takase River
Year of launch1969.
Year Completed1978

Other facilities/observations

The Takase Dam is located further upstream, but the road to it is closed to private vehicles. The road between Nanakura Dam and Takase Dam can be reached on foot or by taking a local cab. Cabs cost 2,400 yen one way (as of 2021).However, since tours are regularly offered at the Takasegawa Tempco Museum and are free of charge, it would be quite advantageous to take a tour there. However, I did not make a reservation for the tour this time, so I did not cover the tour. We will see you next time.(The Takasegawa Tempco Museum was closed due to the Great East Japan Earthquake in 2011, and the bus tours were discontinued.)

Parking lot
PR Exhibition Hall×
This article was written by.
Shin Jinma

Dam enthusiast who loves Momosuke Fukuzawa / Dampedia and Dam News administrator / Certified Dammeister (01-018) by the Japan Dam Foundation / Started selling discharge caution goods.

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  1. puchan says:

    You can easily find the Nanakura Dam downstream on your left before the Nanakura Tunnel, but the road to the top of the dam has an entrance on the left in the middle of the tunnel (it took me two round trips before I realized it).

    • 神馬 シン says:

      Thank you for your comments and information. I was aware that you fenced in the side holes. I simply didn't go to the top end. lol However, I haven't been there for a few years now, so I would like to go back soon. Including the Takase dam.

  2. (polite term for) inviting another to one's home
     I just came here a few minutes ago about the Syrians,
     Since it was an opportunity, I also had a chance to see the dam.

     (Local) There was no mark on the Takase Dam,
     Comment on Nanakura Dam.

     Next time you go, please introduce Takase Dam with a photo...♪♪
     ↑directional marker or indicator
     My log (no one comes here, so I don't get known)
     This is a very inconvenient place, though, as there is no cell phone reception here,
     Autumn is very beautiful.
      Beyond that point, there is a trail in the Northern Alps called Uraginza,
      If you can afford it, you may even climb a mountain.

     Incidentally, the Takase River is said to look green because of minerals mixed in the water, but I don't know what kind of minerals.

    Now then... ♪♪♪

    • Shin Jinma 神馬シン says:

      Thank you for your comments on the Syrians.

      I haven't actually been to Takase Dam yet.
      It's hard to get up off my back when I know I have to walk that far.

      I hope to visit this year! (and I feel like I say that every year)

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