Mishima Dam, Earth-fill dam in Kimitsu, Japan.
Mishima Dam is an earth-fill dam in Kimitsu that stretches 127.7 meters long and rises 25.3 meters tall. It was built by layering and compacting different types of soil to create a waterproof barrier that controls water flow and storage.
This dam was completed in 1955 as part of Japan's postwar efforts to develop water supply and flood control infrastructure. It became an important part of the water management system serving the greater Tokyo region and surrounding areas.
The dam forms part of the Greater Tokyo Area infrastructure system, reflecting Japanese engineering methods in earth-fill dam construction.
You can view the structure from several accessible vantage points nearby that are easy to reach on foot. Visit during drier months when conditions around the site are safest and most comfortable.
The dam features a layered design where a crushed stone outer layer protects the compacted earth core from erosion. This traditional Japanese construction method allows it to function effectively for decades with minimal artificial waterproofing materials.
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