Okiura Dam, Submerged dam in Aomori Prefecture, Japan.
Okiura Dam is a submerged water control structure in Aomori Prefecture designed with specialized underwater engineering. The facility regulates water levels and controls sediment flow while remaining completely hidden beneath the water surface.
The dam was constructed in 1933 as part of Japan's early infrastructure development for water management. Its creation reflected the rise of modern water control projects in the region during the 20th century.
The dam serves as a water source for irrigation in the surrounding farmlands and rice paddies. This role has shaped how local farmers manage their fields and water distribution patterns.
The dam site is accessible from local roads, with informational signs explaining its function and design. Visitors should note that most details are hidden underwater, so viewing from above offers the best perspective.
The structure remains nearly invisible, as it was intentionally built underwater, making it a rare example of Japanese engineering design. This hidden approach allowed water control to function while preserving the landscape above.
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