- Downstream of Keio Sagamihara Line, Tama River Left Bank 26.7K | Tamagawa, Chofu City, Tokyo | Keihin River Office
- Ishihara Water Level Observatory, Tama River Left Bank 27.6K | Tamagawa, Chofu City, Tokyo | Keihin River Office
- Irima River Video Surveillance Station, Irima River | Wakaba-cho, Chofu City, Tokyo | Tokyo Suibou Channel
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