Hydrological Unit: South Branch Patapsco River
| HUC | Name |
|---|---|
| 020600031001 | Gillis Falls |
| 020600031002 | Hay Meadow Branch-South Branch Patapsco River |
| 020600031003 | Piney Run |
| 020600031004 | Piney Branch-South Branch Patapsco River |
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