Okiura Dam was built in 1944 on the Asaseishikawa River in the Iwaki River system in Kuroishi City, Aomori Prefecture, and is Japan's first multipurpose dam for flood control, irrigation, and power generation. It is a gravity rockfill dam with a dam height of 40 meters and a dam length of 171 meters, forming the dam lake "Rainbow Lake." After two major floods in the 1970s, construction of a new dam was planned about 3 kilometers downstream, and was completed in 1988 (Aseishikawa Dam). Okiura Dam was submerged in the new dam lake, completing its role. The name of the dam lake, "Rainbow Lake," has been inherited by the new dam lake. Source: About Shogakukan Digital Daijisen Plus Information |
青森県黒石市、岩木川水系浅瀬石川に建設され1944年に竣工した、治水・灌漑・発電を目的とする日本で最初の多目的ダム。堤高40メートル、堤長171メートルの重力式ロックフィルダムで、ダム湖「虹の湖」を形成。1970年代に起きた2度の大洪水の後、約3キロメートル下流に新しいダムの建設が計画され、1988年に完成(浅瀬石川(あせいしがわ)ダム)。沖浦ダムは新しいダム湖に水没し、役割を終えた。沖浦ダムのダム湖名「虹の湖」は新ダム湖に継承されている。
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