Koya Dam - Wikipedia

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Koya Dam

Official name	古谷ダム
Location	Nagano Prefecture, Japan
Purpose	Flood control
Construction began	1969 (1969)
Opening date	1982; 42 years ago (1982)
Operator(s)	Nagano Prefecture
Dam and spillways
Type of dam	Gravity dam
Impounds	Shinano River
Elevation at crest	48.5 m (159.1 ft)
Reservoir
Catchment area	13 km² (5 mi²)