Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open 8 a.m. – 4:30 p.m., Mon - Fri

TTY 711

12000 Government Center Parkway
Suite 449, Fairfax, Va 22035

Craig Carinci,
Director, Stormwater Planning

Colvin Run Phase II at Lake Fairfax Park Stream Restoration

Project Update: May 26, 2021

Design completion and approval for construction are scheduled to be complete in summer 2021. Construction is tentatively scheduled to begin in summer 2023, dependent upon future budget availability and allocations.

Project Description

looking upstream outer bank erosion
Looking upstream outer bank erosion in upper reach of main stem
looking upstream at incised channel in lower reach of main stem
Looking upstream at incised channel in lower reach of main stem

Restoration of approximately 7,600 linear feet along two tributaries to Colvin Run within Lake Fairfax Park to address actively incising and widening channels. The project will restore the ecological form and function of the stream channels and riparian areas, improve water quality and enhance natural habitats.

The primary goals of the restoration are:

  • Raise channel elevation to reconnect the stream with its floodplain
  • Reduce stream bed and bank erosion
  • Improve water quality via channel stabilization, floodplain connectivity and hyporheic zone enhancements
  • Maintain access to the channels and improve crossings within the park

Project Location

The project is located in Lake Fairfax Park, west of Hunter Mill Rd, in the Difficult Run Watershed and in the Hunter Mill District.

Click here for larger image. The project area is shown in orange dashed outline.

Project Benefits

Improvement of water quality and removal of Nitrogen, Phosphorous and Total Suspended Solids via channel stabilization, native vegetation, floodplain connectivity and hyporheic zone enhancements.

Project Phase

The project is in the design phase.


Design Completion Summer 2021
Start of Construction Summer 2023
Substantial Completion of Construction Summer 2024

What to Expect

Construction access will be from Lake Fairfax Park, off of Lake Fairfax Drive and Hunter Mill Road.

Project Cost and Funding Source

Construction of the Colvin Run Phase II Project is estimated to cost $3.2 million. Stormwater projects are funded through the county Stormwater Service District.

Presentations to the Community

Presentations will be posted as available.


For more information please email Project Manager Justin Pistore, Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-5685, TTY 711.

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