Nagashima Dam, Gravity dam in Kawanehon Town, Shizuoka Prefecture, Japan.
Nagashima Dam is a concrete structure in Shizuoka Prefecture that spans 308 meters across the Ōi River and reaches about 109 meters in height. The dam creates a large reservoir that holds water for flood control and water supply to the surrounding region.
Construction began in 1972 in response to severe flooding that affected the region, and the dam was completed in 2002. The project brought together multiple major construction corporations working together over three decades.
The dam serves as a place where visitors can observe water management at work while enjoying the reservoir and its surroundings. Locals and travelers use the area for fishing and water activities, making it part of the region's recreational life.
The best time to visit is during drier months when the reservoir is visible and easily accessible. Visitors should wear sturdy shoes since the area has uneven terrain.
An upstream check dam is normally hidden underwater and works to prevent silting in the reservoir below. This specialized construction using a cemented sand and gravel mix shows how engineers solve long-term problems with water storage.
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