page_title: List of dams and reservoirs in Japan
section_title: Nagano Prefecture
hierarchical_section_title: List of dams and reservoirs in Japan / Dams by prefecture / Nagano Prefecture
caption_attribution_description: English: Ōmachi Dam. 日本語: 大町ダム。
context_page_description: Below is a list of dams and reservoirs in Japan. As a nation of islands and narrow, steep valleys, dams play a vital role in Japanese society as they are constructed primarily to control floods, supply water and generate hydroelectric power. The tallest dam in Japan is the 186 m high Kurobe Dam. The largest dam by structural volume in the country is the Tokuyama Dam with 13,700,000 m³ of rock-fill. Tokuyama also creates Japan's largest reservoir with a water volume of 660,000,000 m³. Some of the dams are listed below by prefecture.
context_section_description: Achibake Dam
  Akiyama Dam
  Amekawa Dam
  Dorogawa Dam
  Haino Dam
  Hiraoka Dam
  Horikirizawa Dam
  Higashijo Dam
  Himekawa Dam
  Ikusaka Dam
  Ikuta Dam
  Inagawa Dam
  Inekoki Dam
  Iwakura Dam
  Koya Dam
  Kanabara Dam
  Katagiri Dam
  Kiso Dam
  Kitayama Dam
  Kōsaka Dam
  Koshibu Dam
  Lake Kutsuzawa Dam
  Makio Dam
  Matsukawa Dam
  Midono Dam
  Minakata Dam
  Miure Dam
  Minamiaiki Dam
  Minochi Dam
  Minowa Dam
  Misogawa Dam
  Lake Misuzu Dam
  Miwa Dam
  Mizukami Dam
  Nagawado Dam
  Nanakura Dam
  Narai Dam
  Nishiotaki Dam
  Nishiura Dam
  Odagiri Dam
  Okususobana Dam
  Ōmachi Dam
  Onikuma Dam
  Otakigawa Dam
  Saigawa Dam
  Sasadaira Dam
  Sawando Dam
  Sebadani Dam
  Sugadaira Dam
  Susobana Dam
  Taira Dam
  Takase Dam
  Takato Dam
  Tatsugasawa Dam
  Tokiwa Dam
  Toyooka Dam
  Uchimura Dam
  Wachino Dam
  Yamaguchi Dam
  Yasuoka Dam
  Yatategi Sabo Dam
  Yoji Dam
  Yokokawa Dam
  Yukawa Dam
  Yunose Dam
caption: Ōmachi Dam
exif: {}