Map of construction project districts

In Design

Hunter Mill Road over Difficult Run

Constructing a permanent bridge in Fairfax County

Project Photos

Project at a Glance

Begin Date
Summer 2018

$2.2 million


Northern Virginia

Brian Morrison, P.E.
Project Coordinator

About the Project

The purpose of this project is to replace the temporary Hunter Mill Road (Route 674) bridge over Difficult Run.  A temporary bridge was installed in November 2011 to replace the original structurally deficient bridge while VDOT developed plans for a permanent structure.   

The bridge width will be widened to accommodate an 11-foot wide lane in each direction and four-foot wide shoulders to address recommendations by the 2006 Hunter Mill Road Traffic Calming Study.  Accelerated construction methods will be utilized along with reusing the temporary bridge foundations to minimize the construction duration.  The bridge length will be approximately 50 feet.  Hunter Mill Road at Difficult Run will be closed for approximately 20 days during construction and traffic will be detoured as it was during installation of the temporary bridge.

The existing bridge has an average traffic count of 17,000 vehicles per day, and a projected count of 22,000 vehicles per day for the design year of 2035.

Schedule & Costs

Anticipated Schedule
Advertisement - January 2018
Construction – Summer 2018 (late July to mid-August closure)

Estimated Costs

Preliminary engineering: $390,000
Right-of-way and utilities: $435,000
Construction: $1.4 million
Total: $2.2 million

Traffic Impacts

The bridge will be closed during construction. The work zone will be marked and signed to help traffic follow the detour via Lawyers Road, Twin Branches Road, and Sunrise Valley Drive.


Design Public Hearing displays | brochure (June 17, 2015)

Community meeting presentation (Dec. 8, 2014)

Detour Map

Project Numbers

State: 0674-029-989
UPC: 102691

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Page last modified: March 11, 2016