Japan National Route 397

National Route 397 is a national highway of Japan connecting Ōfunato, Iwate and Yokote, Akita in Japan, with a total length of 137.8 km (85.62 mi).

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The Koyagi Bridge carries Route 397 over the Kitakami River in Mizusawa Ward, Oshu City, Iwate Prefecture. This bridge was built in 1978 but the center span fell in 1994.