Ōmachi Dam, Gravity dam in Ōmachi, Japan.
The Ōmachi Dam is a concrete gravity structure on the Takase River in Nagano Prefecture. The facility includes four radial gates and stores water for hydroelectric power generation and regional water supply.
The dam was completed in 1985 as a major infrastructure development for water management in Nagano Prefecture. Its construction represented an important advancement in modern Japanese hydroelectric facility engineering.
The dam interior includes an inspection gallery where visitors observe the engineering methods used in Japanese hydroelectric infrastructure development.
The facility offers tours through the inspection gallery where visitors can observe the internal structures and engineering methods. It is advisable to check accessibility in advance since maintenance work may occasionally affect visiting conditions.
The reservoir reaches an elevation of 898 meters and features four radial gates capable of managing water flow at 1,910 cubic meters per second.
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