Rock Run (Potomac River)
Rock Run is a tributary stream of the Potomac River in Montgomery County, Maryland. The headwaters of the stream rise in the village of Potomac, and the creek flows southeast for 5.3 miles (8.5 km) to the Potomac River.
A portion of the stream runs through Rock Run Stream Valley Park, an undeveloped park that is part of the Montgomery County MD park system.