Qualla: Naruko Dam: Where Carp Climb a Waterfall

Naruko Dam: Where Carp Climb a Waterfall: Introduction

Tue, 17 Feb 2026 00:00:00 GMT

Photo credit photo: Qurren (talk), CC BY-SA 3.0. Every May, something impossible appears to happen at Naruko Dam. Snowmelt from the Ou Mountains fills the reservoir past capacity, and water cascades over the dam crest in a broad, even sheet that locals call the "sudare" -- the bamboo blind discharge. On Children's Day, May 5th, colorful carp streamers are strung across the gorge in front of the falling water. From the viewing platforms, the streamers appear to be swimming upward through the curtain of spray, as if climbing the waterfall itself. It is a spectacle perfectly suited to a structure built to prove that Japanese engineers could accomplish what foreign experts said they could not.

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Image: photo: Qurren (talk) | CC BY-SA 3.0

Naruko Dam: Where Carp Climb a Waterfall: Born from Typhoons

Tue, 17 Feb 2026 00:00:00 GMT

Photo credit photo: Qurren (talk), CC BY-SA 3.0. The Eaigawa River, the largest tributary of the Kitakami River system in Miyagi Prefecture, had flooded the agricultural plains below for as long as anyone had been farming them. Initial surveys for a dam began in 1941 but were interrupted by World War II. Then came Typhoon Kathl...

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Image: photo: Qurren (talk) | CC BY-SA 3.0

Naruko Dam: Where Carp Climb a Waterfall: A Dam Without Foreign Hands

Tue, 17 Feb 2026 00:00:00 GMT

Photo credit Ippukucho, CC BY 3.0. Construction began in 1951, and the dam was completed in 1958 by Kajima Corporation after seven years of work. Naruko was the third concrete gravity-arch dam completed in Japan, following the Mimoro Dam on the Hii River and the Kamishiiba Dam on the Mimi River. But it carries a d...

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Image: Ippukucho | CC BY 3.0

Naruko Dam: Where Carp Climb a Waterfall: The Lake and the Gorge

Tue, 17 Feb 2026 00:00:00 GMT

Photo credit Alexrk2, CC BY-SA 3.0. Behind the dam, the reservoir called Lake Arao fills a basin surrounded by the peaks of the Kurikoma Quasi-National Park. The lake and dam sit at the upper end of Naruko Gorge, a dramatic 100-meter-deep canyon where the Eaigawa has carved through volcanic rock over millennia. In ...

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Image: Alexrk2 | CC BY-SA 3.0

Naruko Dam: Where Carp Climb a Waterfall: Concrete and Carp Streamers

Tue, 17 Feb 2026 00:00:00 GMT

Photo credit photo: Qurren (talk), CC BY-SA 3.0. Naruko Dam is managed by the Tohoku Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism, and it remains a working piece of infrastructure -- flood gates, power turbines, irrigation intakes all operational. But it has also become a destinatio...

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Image: photo: Qurren (talk) | CC BY-SA 3.0