Hydrological Unit: Headwaters Patuxent River
| HUC | Name |
|---|---|
| 020600060101 | Cabin Branch-Patuxent River |
| 020600060102 | Cattail Creek |
| 020600060103 | Triadelphia Reservoir-Patuxent River |
| 020600060104 | Hawlings River |
| 020600060105 | Rocky Gorge Reservoir-Patuxent River |
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