Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open to the public by appointment only at this time. Please call or email 8 a.m. – 4:30 p.m., Monday - Friday

TTY 711

12000 Government Center Parkway
Suite 449, Fairfax, Va 22035

Craig Carinci,
Director, Stormwater Planning

Piney Run Stream Restoration at Lake Werowance

Project Update: September 22, 2021

Construction will begin fall 2021.

Photo- QR Code Pardon Our Dust MS Teams meeting Piney Run Lake WerowanceA ‘Pardon Our Dust’ virtual meeting is scheduled on Thursday, October 21 at 7 p.m. To join the meeting use the meeting link or scan the QR code by using the camera on your mobile phone.

Project Background

This project was identified for stream restoration in the FY 2017 work plan as a result of the erosive stream conditions, the dam breach at Lake Werowance in 2012 and the flow from Piney Run that cut down into the former lakebed.

In February of 2018, Fairfax County’s Stormwater Planning Division staff initiated the design of the project. Since then, Stantec Consulting Services, Inc. (Stantec) has developed and refined a design for the project. Stream and wetland assessments, land survey and soils analyses have been completed within the project area. Stantec Consulting Services, Inc., completed a preliminary design with alternatives that were presented to the community at a meeting at Great Falls Elementary School.

Project Description

A storm in 2012 caused the dam embankment of Lake Werowance to be breached. Since then, the flow from Piney Run has cut down into the former lakebed. Streambank erosion contributes to sediment and nutrient transport. Wetlands exist within the former lakebed although there is inadequate vegetation to provide streambank stability. A stream enhancement and restoration pre-concept plan was done in July 2018 and the pre-concept plan provided several options for the stream alignment. The option that incorporated bank stabilization and floodplain connectivity was selected. This project is part of Fairfax County’s larger efforts to restore many of the county’s degraded streams while improving overall water quality and the condition of the Chesapeake Bay.

The primary goals of the stream restoration are:

  • Stabilize the channel and prevent future erosion and degradation
  • Restore native trees and herbaceous planting
  • Provide water quality benefits by reducing sediment loads and enhancing floodplain connection
  • Connect and enhance wetlands within the former lakebed
  • Increase wetland area and species diversity

Project Location

Map - Piney Run Stream Restoration at Lake Werowance
The project area is shown in red outline. Download a large detailed map.

The project is located south of the intersection of Walker Road and Manning Street. It is bordered to the west by Walker Road, Windswept Drive and Murphy Drive; to the north and east by Manning Street; and to the south by Park Royal Drive. This project starts from the bridge at Manning Street, extends through the dry lakebed, and follows Piney Run behind Murphy Drive.

Project Benefits

  • Protect private property, county infrastructure and surface waters
  • Improve water quality through the removal of nitrogen, phosphorous and total suspended solids
  • Stop a source of sediment and pollutants from reaching the Chesapeake Bay
  • Enhance existing wetlands, restore native vegetation and improve habitat for wildlife
  • Restore the ecological function of the wetlands along the stream corridor


The project design was completed in August 2020 and was authorized for construction. A timeline for construction is expected in the Fall 2021.


The project design was completed in August 2020.


Over the next several months, flagging and survey markers will be visible throughout the project area. Contractors and staff will primarily access the site on foot, wearing high-visibility clothing. Following the commencement of construction, equipment access and deliveries will most likely enter the site via Manning Street. Residents should expect periodic deliveries of material using dump trucks to the site throughout the week starting after 7 a.m. on weekdays. At some periods during construction, work may occur on weekends; deliveries on those days will be made after 9 a.m.


Stormwater projects are funded through the county Stormwater Service District.



For more information please email Neely Law, Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-6527, TTY 711.

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