The project design is expected to be completed in 2022.
This project was identified in the Difficult Run Watershed Management Plan for stream restoration and stabilization activities. It was placed in the county's Fiscal Year 2019 work plan as a result of severe erosion and maintenance issues related to a downstream stormwater management basin.
The project will restore about 2,000 linear feet of natural stream channel, replace the culvert under Ashgrove Lane and repair the trail. The stream channel exhibits severely eroded and over-widened banks, and the potential for further bed and bank instability. This project is part of larger efforts to restore many of Fairfax County’s degraded streams while improving overall water quality and the condition of the Chesapeake Bay.
The primary goals of the restoration are:
Stabilize the channel and prevent future erosion and degradation along the stream
Improve water quality through the removal of nutrients (nitrogen and phosphorous) and sediment
Protect the high-quality forest upstream of the Ashgrove Lane Trail
Replace the culvert under the Ashgrove Lane Trail and repair the trail. If the culvert fails, there will be massive erosion and tree loss in the upstream forested area
Create a healthy ecosystem by restoring the channel and planting native trees and herbaceous plants
The project is located on public land and within stormwater easements south of the Dulles Access Road, extending downstream through Old Courthouse Spring Branch Stream Valley Park to Ashgrove Lane.
The county received the concept design plan in July 2020. A public walk was held in August 2020. The county is working to obtain the necessary easements before moving forward with the next design phase.
The environmental benefits of the project are:
Improved watershed conditions
Reduced downstream impacts by controlling velocity, reducing erosion, protecting infrastructure
Improved buffer quality
Project Cost and Funding Source
Design of the Old Courthouse Spring Branch at Ashgrove Historic Park stream restoration project is funded for $900,000. Construction funding is dependent upon future budget availability and allocations. Stormwater projects are funded through the county Stormwater Service District.
Presentation to the Community
For more information please email Project Manager Shannon Bell, Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-5802, TTY 711.