Japan National Route 397

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National Route 397 shield

National Route 397
Route information
Length 137.8 km (85.6 mi)
Highway system
National highways of Japan
Expressways of Japan

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).

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.