Piney Run (Virginia)

Piney Run
Creek
Falls of Piney Run
Country	United States
State	Virginia
Region	Loudoun County
Tributaries
- left	Sweet Run
Source
- location	Neersville
- elevation	650 ft (198 m)
- coordinates	39°14′N 77°44′W / 39.24°N 77.74°W / 39.24; -77.74
Mouth	Potomac River
- location	Loudoun Heights
- elevation	240 ft (73 m)
- coordinates	39°19′N 77°43′W / 39.32°N 77.71°W / 39.32; -77.71Coordinates: 39°19′N 77°43′W / 39.32°N 77.71°W / 39.32; -77.71
Length	9 mi (14 km)
Basin	15.2 sq mi (39 km2)

Piney Run is a tributary of the Potomac River in Loudoun County, Virginia. The creek is the principle drainage of the upper Between the Hills valley in northwestern Loudoun County.

The headwaters of the creek are located approximately 1.75 miles (2.82 km) south of Neersville, Virginia, just west of State Route 671 (Harpers Ferry Road). Just prior to an impoundment, 5 miles (8.0 km) from its headwaters on the property of the Blue Ridge Center for Environmental Stewardship, the creek is joined by its only named tributary branch, Sweet Run. From the impoundment, the creek flows 2 miles (3.2 km), to the crossing by State Route 671, whereupon the creek cuts a deep gorge, falling 150 feet (46 m) over its last 2 miles (3.2 km). Just prior to its confluence with the Potomac below the White Horse Rapids, 4,500 feet (1,400 m) down river from the confluence with the Shenandoah River, the creek passes through a culvert under U.S. Route 340 and then cascades approximately 20 feet (6.1 m) over a waterfall, the only in Loudoun County.