Hiraoka Dam (平岡ダム Hiraoka damu) is a dam in Tenryū Nagano Prefecture Japan completed in 1951. It is located on the Tenryū River upstream from the Sakuma Dam.During the Second World War prisoners of war held at Tokyo #2D (Mitsushima) Prisoner of War Camp provided labour to build the penstock tunnel to the powerstation collect aggregate and mix cement for the construction of the dam between November 1942 and August 1945.
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