Almost 90 percent of Pimmit Run is located outside Arlington. Included within this area is the Little Pimmit Run watershed, of which 57 percent is located within Arlington. The portion of Little Pimmit Run within the County’s border is located in north Arlington in a primarily residential neighborhood.
Little Pimmit Run drains into Pimmit Run, then the Potomac River. Pimmit Run has a drainage area of 12.4 square miles. While the Little Pimmit Run subwatershed includes Arlington and Fairfax counties, our legal authority is only limited to runoff generated within Arlington’s borders.
(, 0B) Drainage area for the Little Pimmit Run monitoring site.
We assessed all the streams in the County as part of the Stormwater Master Plan Update. The assessment used the Channel Evolution Model to evaluate which sections of the streams are actively eroding to prioritize them for stream restoration. During that assessment, Pimmit Run was evaluated to be a priority stream for stream restoration given that approximately more than 30 percent of the stream length assessed was found to be in an actively eroding state. In addition, less than 3 percent of the stream channel has been artificially stabilized. Although 70 percent of Little Pimmit Run was found to be in an actively eroding state, almost 90 percent of the stream has been artificially stabilized.
A watershed retrofit study of Little Pimmit Run was completed.
The monitoring site is located near the intersection of 38th Street North and North Dumbarton Street.
Macroinvertebrates commonly found are:
There is one bacteria monitoring site on Little Pimmit Run located near the intersection of 38th Street North and North Dumbarton Street. Learn more about bacteria monitoring data.
To become a volunteer stream monitor, contact Lily Whitesell at 703-228-3042.