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

703-324-5500
TTY 711

12000 Government Center Parkway
Suite 449, Fairfax, Va 22035

Craig Carinci,
Director, Stormwater Planning

Little Pimmit Run Tributary at Woodland Terrace Stream Restoration (SD-000031-34)

Project Update: April 20, 2021

The stormwater improvement project is funded for design only. The field assessment for the channel and intersection of North Albemarle Street and Chesterbrook Road was completed in April 2020 to evaluate the project site and identify restoration options.

The concept plan was received on March 13, 2020, with a community meeting held on September 30, 2020. Prior to moving the project to final design, all land rights must be acquired from private properties impacted by the project. The design is being coordinated with the FCDOT sidewalk project and VDOT for drainage improvements in the intersection.

Flooding on Chesterbrook Road
Flooding on Chesterbrook Road July 8, 2019

 

Project Background

Present Condition
Present condition

The project was identified in the FY 2020 workplan due to repeated flooding at the intersection of North Albemarle Street and Chesterbrook Road and severe stream bank erosion upstream of this intersection. In October 2019, staff of the Stormwater Planning Division initiated the design of the project.

The project is being done in collaboration with the Virginia Department of Transportation (VDOT) to improve the storm sewer system within the VDOT road right-of-way. The Fairfax County Department of Transportation (FCDOT) is also managing a project to install a new sidewalk along Chesterbrook Road. FCDOT’s sidewalk project is being completed in phases. Phase 1 which extends from Kirby Road to Little Pimmit Run near Maddux Lane is complete. 

Additional information on FCDOT’s sidewalk project is available at  Chesterbrook Road Sidewalk (Chesterford Way to Maddux Lane).

Project Description

The project assessed approximately 1,000 linear feet of an unnamed tributary to Little Pimmit Run between Forest Lane and North Albemarle Street in McLean. The assessment resulted in a project scope that includes 450 linear feet of stream below an outfall at Forest Lane and an additional 550 linear feet of stream between Woodland Terrace and North Albemarle Street. The culvert at North Albemarle Street regularly has drainage issues with blockages caused by sediment and debris during larger storm events. The relatively low slope of this section prevents the sediment from moving through the pipe and may block the culvert contributing to flooding at the intersection.

The stream segments above and below the enclosed pipe are constrained by adjacent, privately owned land that have excessive erosion of the banks and stream channel incision. The lower reaches of the stream above the culvert at North Albemarle has more open land, is relatively flat and exhibits less erosion and instability. The purpose of the project is to restore the eroding channel to minimize the continued loss of sediment downstream, address flooding issues at the intersection of Chesterbrook Road and North Albemarle Street and improve water quality. The limits of the stream restoration project will be refined through the design iterations and may not include the full length of the assessed stream.

The primary goal of this restoration is to stabilize the channel and prevent future erosion and degradation along the stream. Drainage improvements at the intersection will alleviate future flooding. Restoration of native plantings will also be implemented after construction in order to promote diversity and the development of a healthy ecosystem. This project is part of Fairfax County’s larger efforts to restore many of the county’s degraded streams while also improving overall water quality and the condition of the Chesapeake Bay.

Project Location

The stream restoration project is located between Forest Lane and North Albemarle Street with drainage improvements at the intersection of Chesterbrook Road and North Albemarle Street.

The project is in the Dranesville District and in the Pimmit Run Watershed.

map - little pimmit run tributary and woodland terrance stream restoration

 

Project Benefits

Upon completion, the project will:

  • Restore stream channel stability by reducing erosion
  • Protect surface waters, private property, and county infrastructure
  • Mitigate flooding at the intersection of North Albemarle Street and Chesterbrook Road
  • Restore native vegetation and plant diversity
  • Improve water quality and stop a source of sediment and pollutants that are bound to those sediments that flow into Little Pimmit Run then Pimmit Run to the Potomac River, and thus to the Chesapeake Bay

PROJECT PHASE

The project is funded for design.

PROJECT TIMELINE

Coordination with property owners and acquisition of easements is ongoing. Final design is scheduled to be completed in November 2021 pending land acquisition and coordination of utilities.

WHAT TO EXPECT

Over the next several months flagging, survey markers, and survey crews may be visible throughout the project area. Contractors and staff will primarily be on foot and wearing high-visibility clothing.

PROJECT COST AND FUNDING SOURCE

The drainage improvements within the road right-of-way and restoration of the Little Pimmit Run Tributary channel are estimated to cost $3.7 million. Stormwater projects are funded through the county Stormwater Service District. Construction is based on approval of future funding.

Presentations to the Community

Public meetings for the project will be scheduled as the status of Covid-19 restrictions permit.

Contact

For more information email Project Manager Fred.Wilkins@fairfaxcounty.gov, Department of Public Works and Environmental Services, Stormwater Planning Division, or call (703) 509-0511.

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