Hydrological Unit: Difficult Run-Potomac River
| HUC | Name |
|---|---|
| 020700081001 | Muddy Branch |
| 020700081002 | Watts Branch |
| 020700081003 | Cabin John Creek |
| 020700081004 | Difficult Run |
| 020700081005 | Nichols Run-Potomac River |
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