Kassa Dam, Rock-fill dam in Yuzawa, Japan
Kassa Dam is a rock-fill dam near Yuzawa that rises 90 meters above the surrounding landscape. It creates Tashiro Lake, which serves as the upper reservoir supplying water to the Okukiyotsu Power Station below.
The dam was built between 1972 and 1978, marking a major step forward in Japan's hydroelectric development. The project helped modernize power supply in the mountainous region.
The nearby Okky Museum teaches visitors how hydroelectric power works through displays and educational activities. The site demonstrates the importance of renewable energy to the region's way of life.
Visit during daylight hours to see the dam and surrounding landscape clearly against the mountains. The site offers multiple viewpoints and walking paths that let you experience different angles of the structure and its setting.
The dam works together with the nearby Futai Dam as a two-reservoir system that supplies two separate power plants. This connected setup shows how Japan uses multiple dams in the mountains to generate electricity efficiently across the region.
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