Use this map to explore sub-watersheds of the Potomac River basin. Click on a watershed to view more information. Learn more about the basin, its people, its water, and its land on our Potomac Basin Facts page.
To locate and learn about watershed groups or organizations doing work in the Potomac basin near you, click here.
To learn about water quality monitoring efforts in the basin click here. Download map of major tributaries. Download map of sub-watersheds.
