The East Branch Brandywine Creek is a 27.4mi tributary of Brandywine Creek in Chester County, Pennsylvania in the United States.CourseThe creek starts in Suplee near Honey Brook, and joins the West Branch Brandywine Creek in Lenape. From its source, the creek flows east, then southeast, passing through the borough of Downingtown. The creek starts at an elevation of above sea level drops to an elevation of at its confluence with the West Branch.Natural historyAverage annual precipitation is.The East Brandywine is known for its fish. The game species are Rainbow trout, Brown trout, Brook trout, Smallmouth bass, Largemouth bass, Bluegill, Common carp. White Suckers and Creek Chub are also very common.HistoryThe East Brandywine served as a source of energy for hundreds of years. The waters also powered many factories in Downingtown.