Piedmont Basin
The entire Piedmont Basin, 80% of which lies in Pennsylvania, empties into the Delaware River.
Photo: Brecks Mill on the Brandywine, by Joseph Zumer
Watersheds in the Piedmont Basin
Brandywine Creek • Christina River • Naamans Creek • Red Clay Creek • Shellpot Creek • White Clay Creek
Brandywine Creek • Christina River • Naamans Creek • Red Clay Creek • Shellpot Creek • White Clay Creek
Quick Facts
- Size: 605.3 square miles
- Size (DE only): 181.9 square miles
- 2019 U.S. Census Bureau Population: 752,928
- 2019 U.S. Census Bureau Population (DE only): 422,749
- States: DE, PA and MD
- Counties: DE: New Castle | PA: Chester, Delaware, Lancaster | MD: Cecil