Nanairo Dam

33°57′37″N 136°00′08″E / 33.96028°N 136.00222°E / 33.96028; 136.00222Construction began1963Opening date1965Owner(s)Electric Power Development CompanyOperator(s)Electric Power Development CompanyDam and spillwaysType of damArch-gravity damImpoundsKitayama River of the Kumano River SystemHeight61 m (200 ft)Length200.8 m (659 ft)ReservoirTotal capacity61,300,000 m³ (49,700 acre⋅ft)Catchment area462 km² (178 sq mi)Surface area332 ha (820 acres)Power StationAnnual generation350 MW (470,000 hp)

The Nanairo Dam (七色ダム, Nanairo-damu) is a concrete gravity-arch dam located in Kumano, Mie Prefecture, Japan. The dam crosses the Kitayama River, a tributary of the Kumano River near the border of Mie Prefecture with Wakayama Prefecture.^[1]

The dam was constructed by Obayashi Corporation, with construction starting in 1963, and completed by 1965. It is currently owned maintained by the Electric Power Development Company. The primary purpose of the dam is hydroelectric power generation, with the dam supplying the nearby Ikehara Power Plant, with an installed turbine capacity of 350 megawatts (470,000 hp). The reservoir behind the dam also serves as a pumped storage facility in conjunction with neighboring Ikehara Dam in Wakayama.

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