Under Construction: Hunter Mill Road over Colvin Run Bridge Replacement in Fairfax County

Cost and schedule ►

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Public outreach ►

Please note: Hunter Mill Road traffic shifted onto a portion of the new bridge over Colvin Run Dec. 30. One lane of alternating traffic is traveling across the newly constructed portion of the bridge while the old bridge is demolished and the remaining portion of the new bridge is built. There is no posted weight limit for the current bridge.

Temporary traffic signals and Driveway Assistance Devices are in place along Hunter Mill Road just north and south of Colvin Run until later this spring, read more in the traffic alert.

This project is replacing the old weight-restricted, one-lane Hunter Mill Road (Route 674) bridge over Colvin Run that was built in 1974. The new bridge will have two lanes separated by a median/splitter island.

The project also includes:

  • An improved trail crossing south of the bridge
  • Landscaping in the median/splitter island 
  • Abutments for a new trail bridge over Colvin Run (Fairfax County will construct the trail bridge in the future)

Hunter Mill Road averages 7,400 vehicles a day within the project limits.

Estimated Costs
Preliminary Engineering - $1 million
Construction - $4.2 million
Total: $5.2 million

This project is financed with federal, state (including State of Good Repair funds used for bridges) and Fairfax County funding.


The project aims to reduce congestion and improve operations and safety.

Major Milestones 

Public Information Meeting - April 2018
Virtual Public Involvement - May/June 2020
Virtual Design Public Hearing - September 2020
Advertise for Construction - February 2021
Award Construction Contract - April 2021
Begin Construction - August 2021
Final Completion - Late Spring 2023


Contact Info:

Oscar Jamilla, DPE, PMP

Chan Basnayake, P.E., PMP, CCM

Project Photos

Other relevant links:

Construction Start News Release - August 2021

Virtual Design Public Hearing 
VideoPresentationComment SheetAd and Webpage - September 2020

Project Plans - June 2020

Conceptual Bridge Replacement Study Report - October 2017

Previous Meetings >>

Major funding source: State of Good Repair

Phase: Under Construction

UPC: 110499, 110433

State ID: 0674-029-358, P101, B643

Lat/Long: 38.965604, -77.309634

Locality: Fairfax

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View of the bridge, looking north on Hunter Mill Road - July 2022
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June 2022
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Pre-construction view of the bridge, looking south on Hunter Mill Road
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Pre-construction profile view of the bridge
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Profile rendering of the new bridge

Page last modified: April 11, 2023