The Scotts Run at Dolley Madison stream restoration project in Tyson will restore approximately 2,500 linear feet of Scotts Run and tributaries using Natural Channel Design. The project site is largely within a conservation and storm drainage easement and includes a main stem and two tributaries that are located between Scotts Crossing Road and Dulles Access Toll Road - Route 123 Interchange. The drainage area is approximately 840 acres and is highly impervious. The main channel exhibits an over-widened and straightened channel with undercuts and exposed banks with failing riprap along the banks. One of the tributaries appears to be in relatively good condition pending further assessment. Excessive non-native vegetation exists throughout the project site as the stream traverses a wooded valley adjacent to residential and commercial development in Tysons. Restoration objectives include stream stabilization, water quality improvement, aquatic and riparian habitat enhancement and reconnection of the stream with its floodplain.
An additional 2,800 linear feet of stream restoration work is under construction upstream at Scotts Run at Old Meadow in collaboration with Cityline Partners, LLC (Cityline). See a description of the project.
The project includes restoration of approximately 2,500 linear feet of Scotts Run, its tributaries, stormwater outfalls and the floodplain within the stream valley between Scotts Crossing Road and Dulles Access Toll Road - Route123 Interchange in McLean.
Restored ecological function of the stream corridor.
Improved water quality through stream stabilization and through the removal of nitrogen, phosphorous and total suspended solids.
Improved forest health through the removal of invasive plant species and new installations of locally native plant species.
Stream corridor assessment is underway.
The stream and adjacent riparian area assessments are scheduled for completion in late spring of 2021. Concept design is scheduled to be completed during the winter of 2022. A virtual public meeting is planned for spring of 2021.
What To Expect
Over the next several months, the design team will be walking the project area conducting survey and assessment work.
Project Cost and Funding Source
Restoration of this section of Scotts Run is estimated to cost $3.3 million. Stormwater projects are funded through the county Stormwater Service District.
For more information, please email Project Manager, Neely Law, Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-6527, TTY 711.