- Shintone River Bridge, National Highway No. 4 53.0KP | Mizuumi, Koga City, Ibaraki Prefecture | Utsunomiya National Highway Office
- Koga Water Level Observatory, Watarase River Left Bank 3.6K | Sakuramachi, Koga City, Ibaraki Prefecture | Tonegawa Upstream River Office
- Watarase River left bank 0.3KP | Torihami, Koga City, Ibaraki Prefecture | Ministry of Land, Infrastructure, Transport and Tourism River Disaster Prevention Information
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