Seneca Creek (Potomac River)

Seneca Creek is a 5.8mi stream in Montgomery County, Maryland, USA, roughly 16mi northwest of Washington, D.C. It drains into the Potomac River.CourseThe creek begins with two main tributaries: Great Seneca Creek, long, begins in Damascus and flows south past Montgomery Village, Germantown, Gaithersburg and Seneca Creek State Park.Little Seneca Creek, long, rises in the Clarksburg area, flows south through Little Seneca Lake and Black Hill Regional Park, and the community of Boyds. These tributaries converge near Darnestown. Another major tributary, Dry Seneca Creek, empties into Seneca Creek west of Darnestown. The creek continues south and passes under Seneca Aqueduct/Riley's Lock (Lock 24) of the Chesapeake and Ohio (C&O) Canal before it flows into the Potomac River. There is about a 600ft change in elevation from the stream's upper sources to its mouth at the Potomac. Seneca Creek has a watershed area of 121sqmi.