Shintoyone Dam, Arch dam in Toyone, Japan
Shintoyone Dam is an arch dam spanning 311 meters across the Toyone River, rising approximately 117 meters high in Aichi Prefecture's mountains. The structure uses a pumped-storage system that circulates water between two reservoirs to generate electricity.
Construction began in 1969 and finished in 1972, marking a shift toward modern hydroelectric power in the region. The project reflected Japan's growing energy demands during the post-war economic boom.
The dam created Lake Midori, which is now woven into local life through fishing, boating, and other water-based activities. Locals and visitors use the water for leisure, making it more than just a utility facility.
The site is accessible by road with observation points offering views of the dam structure and the reservoir. Spring through autumn is the best time to visit, when the weather is mild and surrounding trails are easy to walk.
The dam works with two separate reservoirs, moving water uphill and downhill based on electricity demand, a system rarely seen at this scale. This flexibility allows the facility to respond instantly to power needs throughout the day.
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