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| HUC | Name |
|---|---|
| 0206000301 | Winters Run-Bush River |
| 0206000302 | Romney Creek-Frontal Chesapeake Bay |
| 0206000303 | Upper Gunpowder Falls |
| 0206000304 | Middle Gunpowder Falls |
| 0206000305 | Lower Gunpowder Falls |
| 0206000306 | Gunpowder River-Frontal Chesapeake Bay |
| 0206000307 | Back River-Frontal Chesapeake Bay |
| 0206000308 | North Branch Patapsco River |
| 0206000309 | Gwynns Falls |
| 0206000310 | South Branch Patapsco River |
| 0206000311 | Patapsco River |
| 0206000312 | Patapsco River-Frontal Chesapeake Bay |
