Oigawa Dam, Gravity dam and hydroelectric station in Shizuoka Prefecture, Japan.
The Oigawa Dam is a concrete barrier built across the Oi River in Shizuoka Prefecture to control water flow and generate power. The structure spans the river valley with spillways and turbine facilities integrated into its main body.
Work on the structure started in the 1930s through an international partnership that was eventually taken over by Japanese companies. It became one of the early hydroelectric facilities developed during Japan's expansion of domestic power infrastructure.
The dam represents early Japanese industrial development, marking the transition from international partnerships to domestic infrastructure management in the power generation sector.
The site is accessible by bus along Prefectural Road 60 and connects to regional train stations. Access may vary depending on maintenance work and seasonal conditions.
This is the second major facility of its kind built directly on the main course of the Oi River. Its position in the river hierarchy reflects important decisions made during Japan's early hydroelectric expansion.
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