https://www.eopugetsound.org/hot-topics/watershed-hydrologic-unit-codes-huc
Watershed hydrologic unit codes (HUC) | Encyclopedia of Puget Sound
There are many ways of defining the boundaries of the Puget Sound watershed. Hydrologic unit codes (HUCs) are nationally standardized divisions that are often...
hydrologic unit codespuget soundwatershedhucencyclopedia