Hiraoka Dam

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Dam in Nagano, Japan

Hiraoka Dam

Location	Tenryū, Nagano, Japan
Construction began	1938
Opening date	1951
Dam and spillways
Type of dam	Concrete gravity dam
Impounds	Tenryū River
Height	62.5 m
Length	258 m
Dam volume	252,000 m³
Reservoir
Total capacity	42,425,000 m³
Catchment area	3,650 km²
Surface area	258 ha

Hiraoka Dam (平岡ダム, Hiraoka damu) is a dam in Tenryū, Nagano Prefecture, Japan, completed in 1951.^[1] 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. Fifty seven prisoners died from diseases relating to poor sanitary, diet, and climate conditions.