The Ōi Dam (大井ダム Ōi Damu) is a dam located between the cities of Ena and Nakatsugawa in Gifu Prefecture Japan. It was built to produce electricity for the surrounding area. The Agi River flows through the damn.Built in 1924 the Ōi Dam was the first dam built anywhere on the Kiso River system. It is also the first hydroelectric dam built in Japan. At 53.4 m (175.2 ft) tall it is the largest gravity dam in Japan after the Taishakugawa Dam in Hiroshima Prefecture.
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