Okususobana Dam, Gravity dam in Nagano Prefecture, Japan.
Okususobana Dam is a gravity dam on the Susobana River in Nagano Prefecture that holds back water through its solid concrete structure. The reservoir supplies nearby areas with water for irrigation and hydroelectric generation.
Hazama Corporation completed this dam in 1980 as part of Japan's infrastructure development for mountainous regions. The project reflected growing needs for water management in rural Nagano.
The dam serves as an educational site where students and professionals study water management systems and engineering practices implemented in Japanese mountainous regions.
The site sits in mountainous terrain and is most impressive during spring snowmelt when water flow increases significantly. Visitors should prepare for changeable mountain weather and wear sturdy footwear.
The dam's position at coordinates 36.725°N and 137.966667°E allows it to capture water from heavy snowfall periods, supporting regional irrigation needs.
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