Hydrological Unit: Ipswich River
| HUC | Name |
|---|---|
| 010900010201 | Upper Ipswich River |
| 010900010202 | Middle Ipswich River |
| 010900010203 | Fish Brook |
| 010900010204 | Howlett Brook |
| 010900010205 | Lower Ipswich River |
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