Tominaga Dam (富永ダム) is a dam in the city of Toyota in the Aichi Prefecture of Japan.

It is a concrete Gravity dam that stands at a height of approximately 107 feet (33 meters) and generates power for Chubu Electric Power.

After the Second World War, Chubu Electric Power, which had been expanding its power supply facilities, made plans to construct their fourth large-scale pumped-storage hydroelectric plant in the Yahagi River system following the Hatanagi, Takane, and Mazegawa dams.

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