Koshibu Dam

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Dam in Nagano Prefecture, Japan

Koshibu Dam

Official name	小渋ダム
Location	Nagano Prefecture, Japan
Purpose	Flood control, irrigation, power generation
Construction began	1961 (1961)
Opening date	1969; 55 years ago (1969)
Owner(s)	Chūbu Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism
Dam and spillways
Type of dam	Arch dam
Impounds	Tenryū River
Reservoir
Creates	Koshibu Lake
Catchment area	288 km² (111.2 mi²)
Koshibu Number 1 Power Plant Koshibu Number 2 Power Plant Koshibu Number 3 Power Plant
Installed capacity	9.5MW 6.5MW 0.55MW