Map of construction project districts

Recently Completed

I-66 Widening

From Route 15 in Haymarket to Route 29 in Gainesville

Area Maps

Project Photos

Project at a Glance

Begin Date
April 2014

Est Completion Date
Completed Aug. 2016

$65 million

Lengths and Limits
Just west of Rt. 15 to just east of Rt. 29 (Gainesville)

Shirley Contracting

Prince William

Northern Virginia

Christiana Briganti-Dunn, P.E., CCM

About the Project

This project added one HOV and one regular lane in each direction from Route 29 in Gainesville to Route 15 in Haymarket, improving traffic flow to and from Haymarket, western Prince William and eastern Fauquier counties. 

Drivers now have three regular lanes and one HOV lane in each direction for 25 miles, from I-495 to Route 15.

Other improvements include:

  • An additional left-turn lane on the westbound ramp to Route 15
  • Installation of components for the Active Traffic Management System
  • New drainage structures, relocated utilities, retaining walls, sound barriers, landscaping and lighting
  • 12-foot paved shoulders

Drivers are advised that work continues on a separate $59 million project at the interchange of I-66 and Route 15 in Haymarket. Crews are constructing the first diverging-diamond interchange in northern Virginia, on schedule for completion in fall 2017.

Estimated Costs
Preliminary Engineering: $2.3 million
Right of Way: $100,000
Construction: $62.1 million
Total: $64.5 million


Jefferson St/Old Carolina Rd bridge demolition meeting presentation (August 2014)
"Pardon our dust" meeting presentation (May 2014)
Design public hearing (July 2011)
Draft environmental document (Categorial Exclusion)
Air quality analysis report
Noise and soundwall documents
Cultural resources survey report  
    Appendix A | B | C | D 

Project Numbers
State: 0066-076-003, P101, RW201, C501, B674, B675 
Federal: NH-5A01(194)  
UPC: 93577

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Page last modified: Aug. 24, 2016