Public Works and Environmental Services

CONTACT INFORMATION: Our administrative offices are open 8 a.m. – 4:30 p.m., Mon - Fri
703-324-5500 TTY 711
12000 Government Center Parkway
Suite 449, Fairfax, Va 22035
Joni Calmbacher
Director, Stormwater Planning

Sunset Hills Road Drainage Improvement Project

Project Update: April 18, 2024

The project focus is being changed from constructing a large regional pond on Hidden Creek Golf Course to restoring Colvin Run from the W&OD Trail to Wiehle Avenue. A new design process will begin in Summer 2024. Staff will schedule a public meeting to update the community once a preliminary design is ready.

W&OD trail embankment with flooding area on left
W&OD trail embankment with flooding area on left

Project Background

This project was identified for flood mitigation in the FY 2018 work plan as a result of repeated flooding in the vicinity of Sunset Hills Road near Isaac Newton Square W in Reston. In February 2018, staff of the Stormwater Planning Division initiated the design of the project.

Project Description

The project area was severely flooded during Tropical Storm Lee. This area does not have overland relief as the W&OD trail embankment is higher than the upstream area of concern.  During large storm events, this embankment impounds flows that exceed the capacity of the historic Civil War culvert that is under the W&OD trail. A flood mitigation conceptual analysis was done in February 2016 which provided several options to mitigate flooding. The option selected balances the upstream flooding with the impact on a downstream golf course. 

The primary goals of the restoration are: 

  • Mitigate the frequent flooding on Sunset Hills Road and properties adjacent to pond number 913
  • Relieve the pressure on the W&OD trail embankment due to ponding of water upstream
  • Provide water quality benefits by upgrading the farm pond to a stormwater management facility on the golf course property 

Project Location

The project is located at the VDOT park and ride lot near the intersection of Sunset Hills Road and Isaac Newton Square W. This project starts from the VDOT park and ride and runs through the W&OD trail embankment to the downstream farm pond located in the Hidden Creek Country Club Golf Course.

Sunset Hills Rd Drainage Improvement Project
The project area is shown in red outline.

Project Benefits

  • Reduction in frequent flooding of Sunset Hills Road and properties adjacent to pond number 913
  • Improvement of water quality through the removal of Nitrogen, Phosphorous and Total Suspended Solids

Project Timeline

Project implementation will likely not occur until FY 2026 and is subject to funding availability.

Project Cost and Funding Source

Construction of the Sunset Hills Road Drainage Improvement Project is estimated to cost about $11 million. Stormwater projects are funded through the county Stormwater Service District.

Presentations to the Community

Sunset Hills Road Drainage Improvement Project - October 4, 2021


For more information, please email the Project Manager, Charles Smith at within the Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-5685, TTY 711.

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