Imaichi Dam

Imaichi Dam is a concrete gravity structure on the Togawa River in Tochigi Prefecture, built to serve as the lower basin of a pumped storage power facility. It measures 177 meters across and rises 75.5 meters above the riverbed.

Tokyo Electric Power Company started construction in 1979 and finished the dam in 1986 as part of its hydroelectric infrastructure expansion. The project responded to growing energy demands in the region during that period.

The dam represents Japanese engineering excellence in water management, contributing to the national focus on renewable energy and resource optimization.

The site is best visited during clear weather when you can see the full structure and surrounding river valley clearly. Access varies by location, so it helps to check local regulations and available viewpoints before arriving.

The structure operates with three underground turbines, each producing 350 megawatts of power and hidden inside the mountain. This setup creates a highly efficient storage system that can store power and release it when demand is needed.

Location: Tochigi Prefecture

Inception: 1979

Height: 75.5 m

GPS coordinates: 36.82556,139.66639

Latest update: December 13, 2025 12:23