Legend (Datawarehouse/USGSWatershedBoundaries)

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