Trip Planner:   Asia  /  Japan  /  Chubu  /  Niigata Prefecture  /  Uonuma  /  Sightseeing  /  Okutadami
Okutadami, Uonuma
(4.1/5 based on 25+ reviews on the web)
The Okutadami Dam is a concrete gravity dam on the Tadami River, 26km east of Uonuma on the border of Niigata and Fukushima Prefectures, Japan. The primary purpose of the dam is hydroelectric power generation and it supports a 560 MW power station which is the largest conventional hydroelectric power station in Japan. The dam also forms the second largest reservoir in Japan, next to that of the Tokuyama Dam.BackgroundConstruction on the dam began and its original 360 MW power station was commissioned 2 December 1960. The rest of the project was complete in 1961. Between 1999 and 2003, the power station was expanded, adding 200 MW in installed capacity. In addition, a 2.7 MW generator was added to ensure a flow of 2.5m3/s downstream for environmental purposes. Along with the same power plant upgrade, a second Kaplan turbine-generator was added to the 83m tall Otori Dam's power station downstream at. This generator has an 87 MW capacity in addition to the existing 95 MW unit, for an installed capacity of 182 MW.DesignThe Okutadami Dam is a 157m tall and 475m long concrete gravity dam with a structural volume of 1636000m3. Sitting at the head of a 595km2 catchment area, the dam creates a reservoir with a 601000000m3 capacity of which 458000000m3 is active (or "useful") storage. The reservoir has a surface area of 1150ha. The power station is underground and located on the right bank of the river next to the dam's abutment. It consists of two underground caverns, one for the original power station and another adjacent for the expansion. After being received by the dam's intake, water supplied to the original power plant travels down three penstocks 185- in length before reaching an individual 120 MW Francis turbine-generator. The 200 MW Francis turbine-generator receives water via a 280m long penstock. After water is processed through the generators, its travels down two tailrace tunnels before being discharged over 3km downstream at the upstream edge of the Otori Reservoir.
Use our Uonuma holiday planner to add Okutadami and other attractions to your Uonuma vacation plans.
Create a full Uonuma itinerary

Plan your trip to Uonuma

  • Get a personalized plan

    A complete day-by-day itinerary
    based on your preferences
  • Customize it

    Refine your plan. We'll find the
    best routes and schedules
  • Book it

    Choose from the best hotels
    and activities. Up to 50% off
  • Manage it

    Everything in one place.
    Everyone on the same page.
  • Sunny and leaves towards the top of the mountain at the end of October, but was the last leaves, very clean. Is a special flight that have lined the cruise ship, did not wait for it. 30-minute course was insisting on a longer course next time. Spring is beautiful and I want to go again. 80% of the silver line, however, going to the Lake okutadami so narrow and dark tunnels, we expect
    View original
  • Okutadami Lake stayed at Oyu Onsen, so very hard to go tried ready. Oku Tadami silver line tunnel is the most much wider road because passing cars and may use the nerves a little. At the end is the souvenir shop 2-3, from there walk uphill from Lake okutadami one-way pay 100 yen, a slope car cable car rides take about 5 minutes. Recommend weaker leg elevation is 50 m because the. Walk on a boat ride soon.
    View original
  • Visited was not impressed by too much, when it was raining at the end of September. Dam lake boat, ample parking, rest, toilet, etc., but is depending on the weather. But I think fall foliage season is testimony of yellow, red and Lake blue and clean.
    View original