Pimmit Run forms south of Leesburg Pike (State Route 7), in Idylwood, Virginia, near George C. Marshall High School. The run flows underground until it crosses Leesburg Pike, then flows openly past Pimmit Hills. Originally, the part of the run South of Leesburg Pike flowed above ground as well, but development gradually forced it underground. The portion of the stream that borders Pimmit Hills was widened and lined with concrete in the early 1970s to prevent flooding. From Pimmit Hills, Pimmit Run flows northeast through Pimmit Run Stream Valley Park and then under the Dulles Toll Road into Devon Park and Chesterbrook Gardens neighborhoods. Pimmit Run continues on its northeastern course meandering through Pimmit Run Stream Valley Park. At Westmont, the stream is joined by Little Pimmit Run before paralleling the George Washington Memorial Parkway and flowing southeast into Arlington. The stream parallels Chain Bridge Road as it bisects the Arlington Bluff and empties into the Potomac just downstream of the bridge.
The stream was named for John Pimmit, who in 1675 was an overseer for William Fitzhugh (1651–1701). Pimmit was naturalized a citizen in 1679, and died by drowning in February 1688. He was survived by three children JOHN, MARGARET & WILLIAM.
Pimmit Run's tributaries are listed from its headwaters to its mouth.
- Bridge Branch
- Burke's Spring Branch
- Saucy Branch
- Bryan Branch
- Little Pimmit Run
- Stromans Branch
According to the Geographic Names Information System, Pimmit Run has also been known by the following names.
- Pimmet's Run
- Catfish Run
- Upper Spout Run
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed August 15, 2011
- STAFFORD COUNTY VA DEED & WILL BOOK 1689 - 1693;: 230. 10 February 1691 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=mrmarsha&id=I48317
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