Hydrological Unit: Monocacy
| HUC | Name |
|---|---|
| 0207000901 | Rock Creek |
| 0207000902 | Marsh Creek |
| 0207000903 | Toms Creek |
| 0207000904 | Double Pipe Creek |
| 0207000905 | Upper Monocacy River |
| 0207000906 | Middle Monocacy River |
| 0207000907 | Lower Monocacy River |
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