Hydrological Unit: Upper Machodoc Creek-Frontal Potomac River
| HUC | Name |
|---|---|
| 020700110601 | Upper Machodoc Creek |
| 020700110602 | Rosier Creek-Frontal Potomac River |
| 020700110603 | Mattox Creek |
| 020700110604 | Popes Creek-Frontal Potomac River |
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