There are over 1,600 miles of streams and associated channels in Fairfax County and more than 1.1 million people. To support our large population, we have lots of infrastructure such as roads, houses, malls, libraries, and schools. As we develop our land, many of our streams have eroded or over-widened when too much stormwater runoff is sent to our streams quickly instead of soaking into the ground. As streams shift, our stormwater infrastructure (pipes that carry runoff from houses, shopping centers, and roads to our streams) may be damaged and need repair.
In order to assess the current condition of our streams and our stormwater infrastructure, staff from the Department of Public Works and Environmental Services will perform a visual stream physical assessment annually between November 15 and May 15. Only a portion of the county will be assessed per year. Please see the Stream Physical Assessment Map for the area of the county that is currently being assessed.
Results from the assessment will be used to:
develop an annual countywide stream physical condition assessment score,
help identify candidate streams for restoration opportunities,
help identify small watersheds where stormwater infrastructure improvements/retrofits or other management actions could improve stream health, and
identify areas needing additional monitoring.
We expect the results to be uploaded annually each summer after the monitoring season has been completed.
Postcards have been sent out to residents who own property in areas that have been identified for assessment in the near future. If you received a postcard and do not grant us permission to enter your property, please contact the Stormwater Planning Division as soon as possible at 703-324-5500, TTY 711 or email us at SWPDmail@fairfaxcounty.gov and provide staff with your name and address.