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

Please note: Temporary traffic signals and Driveway Assistance Devices are in place along Hunter Mill Road just north and south of Colvin Run until spring 2023, read more in the traffic alert.

Vienna: Around noon Wed 9/14, temporary traffic signals and Driveway Assistance Devices (DADs) will be activated along Hunter Mill Rd in the area of Colvin Run to allow construction to continue on the new bridge. Sadly, these DADs won't have jokes. More: https://t.co/RnOKQkydae pic.twitter.com/aZACjX6nUw

— VDOT Northern VA (@VaDOTNOVA) September 12, 2022

This project is replacing the weight-restricted (10 tons) one-lane Hunter Mill Road (Route 674) bridge over Colvin Run. The bridge was originally 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.

Benefits 

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 - Spring 2023