- Ishioka Bridge, Kokai River | Kitanaka, Mashiko-machi, Haga-gun, Tochigi Prefecture 321-4105 | Ministry of Land, Infrastructure, Transport and Tourism
- Hanawa Bridge, Kokai River | Mashiko, Mashiko-machi, Haga-gun, Tochigi Prefecture 321-4217 | Tochigi Prefectural Land Development Department
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