A watershed is the area of land from which water drains into a river, stream, or other waterbody. The Hudson River watershed covers almost 13,400 square miles, and includes hundreds tributary streams. Each of those smaller rivers and streams has its own watershed, and all of these parts add up to the large whole.
The US Geological Survey uses HUCs, or Hydrologic Unit Codes, as a way to divide larger watersheds into smaller scale watersheds. HUC-10 watersheds are about the scale of a Hudson River tributary watershed, and HUC-12 watersheds divide those into even smaller areas.
Hudson River Watershed Map
Map of Hudson River Watershed (PDF)
Facts on Hudson River Watershed (PDF)
Upper Hudson Watershed Maps
Map of Upper Hudson Watershed with HUC-10 subwatersheds (PDF)
Map of Upper Hudson Watershed with HUC-12 subwatersheds (PDF)
Upper Hudson Watershed – HUC-12 subwatershed names (PDF)
Mohawk River Watershed Maps
Map of Mohawk River Watershed with HUC-10 subwatersheds (PDF)
Map of Mohawk River Watershed with HUC-12 subwatersheds (PDF)
Mohawk River Watershed – HUC-12 subwatershed names (PDF)
Hudson River Estuary Watershed Maps
Map of Hudson River Estuary with HUC-10 subwatersheds (PDF)
Map of Hudson River Estuary with HUC-12 subwatersheds (PDF)
Hudson River Estuary Watershed – HUC-12 subwatershed names (PDF)