WBDLine (0)
| 2-digit Hydrologic Unit |
| 4-digit Hydrologic Unit |
| 6-digit Hydrologic Unit |
| 8-digit Hydrologic Unit |
| 10-digit Hydrologic Unit |
| 12-digit Hydrologic Unit |
| 14-digit Hydrologic Unit |
| 16-digit Hydrologic Unit |
2-digit HU (Region) (1)
4-digit HU (Subregion) (2)
6-digit HU (Basin) (3)
8-digit HU (Subbasin) (4)
10-digit HU (Watershed) (5)
12-digit HU (Subwatershed) (6)
14-digit HU (7)
16-digit HU (8)
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