Nanakura Dam, Rock-fill dam in Ōmachi, Japan
Nanakura Dam is a rock-fill dam in Ōmachi that stretches 340 meters in length and reaches 125 meters in height. The structure is built from natural stone materials and holds a large water volume used for power generation.
Construction began in 1971 as part of a pumped storage power station project and was completed in 1978. The facility was built to store water for the region's energy needs.
The structure sits within Chūbu-Sangaku National Park, where visitors notice the changing colors of maple leaves during the autumn months. The surroundings draw people for their natural landscape and appeal to those exploring the region on foot.
The dam sits in a mountainous area and is accessible by car, with viewing areas around the structure. Visitors should be prepared for changing weather conditions and wear sturdy footwear.
The dam's surface uses specialized hard rock layers to withstand rapid water level changes during power generation. This engineering detail is not immediately obvious, but it plays a major role in the structure's durability.
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