 They are Captain Hickory Run, Piney Run, Colvin Run, Snakeden Branch, Little Difficult Run, Rocky Run, Angelico Branch, Piney Branch, and Wolftrap Creek.The water is crossed by several major highways, including Leesburg Pike, I-66, Route 50, the Dulles Access Road, and by the W&OD Trail.The water runs off and forms four man made lakes.