Hydrological Unit: Merrimack River
| HUC | Name |
|---|---|
| 0107000601 | Tannery Brook-Merrimack River |
| 0107000602 | Soucook River |
| 0107000603 | Bow Bog Brook-Merrimack River |
| 0107000604 | Headwaters Suncook River |
| 0107000605 | Suncook River |
| 0107000606 | Piscataquog River |
| 0107000607 | Cohas Brook |
| 0107000608 | Little Cohas Brook-Merrimack River |
| 0107000609 | Souhegan River |
| 0107000610 | Nesenkeag Brook-Merrimack River |
| 0107000611 | Spicket River |
| 0107000612 | Stony Brook-Merrimack River |
| 0107000613 | Shawsheen River |
| 0107000614 | Powwow River-Merrimack River |