Nutley Street Roundabout Bypass Lanes with Direct Access to I-66 Now Open

About the Project

Route 123 (Chain Bridge Road) Interchange

Route 123 (Chain Bridge Road) Interchange

Major reconstruction of the Route 123 (Chain Bridge Road) Interchange is a part of the Transform 66 Outside the Beltway Project. The new interchange design:

  • Provides access to and from the express lanes from I-66 East and West
  • Improves safety at the interchange
  • Connects the City of Fairfax and the planned George Snyder Trail with the new shared-use path and neighborhoods in Oakton with a grade-separated trail through the Route 123 Interchange

Get a closer look with the Transform 66 Interactive Map.

Express Lanes Access at Route 123

  • A ramp from both northbound and southbound Route 123 to the eastbound 66 Express Lanes.
  • A ramp from both northbound and southbound Route 123 to the westbound 66 Express Lanes.
  • Ramps from both directions of the 66 Express Lanes to Route 123 North and South.

Drivers will have improved connections from Route 123 North and South to the I-66 East and West general-purpose lanes.

66 Express Lanes Access at VA-123

Construction Update (Updated September 11, 2023)

Construction Progress:

  • Route 123 North and South bridges are open and in use and the travel lanes in both directions approaching I-66 have shifted into their permanent alignment
  • Box culverts have been installed for shared-use path through the interchange
  • All I-66 East and West travel lanes have shifted to new pavement on the right side (outer portion) of the roadway
  • New ramps have opened for Route 123 North to I-66 West (opened November 2021), Route 123 South to I-66 East (opened March 2022), and Route 123 South to I-66 West (opened April 2022)

Upcoming Construction Activities:

  • Completion of shared-use path along I-66 (66 Parallel Trail) and into City of Fairfax along Route 123 (connection to George Snyder Trail)
  • Planting trees, shrubs, and grass at multiple locations in the interchange
  • Construction of new intersection between I-66 and Eaton Place 

Aerial view of the Route 123 area

Aerial view of the Route 123 area. (April 2023)


Anticipated Schedule Dates
Clearing activities begin Spring 2018
Traffic pattern shifts begin April 2019
Ramp and bridge work begin Summer 2019
Demolition of ramp from I-66 West to Route 123 South January-February 2020
Traffic shifts to new Route 123 bridge span
December 30, 2020
Demolition of old Route 123 bridge span January-February 2021
Construction of second Route 123 bridge span begins Winter 2021
Express Lanes opened November 2022
Shared-use path through interchange opens September 2023
New intersection opens between I-66 and Eaton Place September 2023


Concept plans (I-66) - PDF, 13.7MB
Concept plans (Route 123) - PDF, 12.6MB
Cross sections - PDF, 16.9MB
Plan and profile - PDF, 36.4MB
Planned I-66 trails near Route 123 - PDF, 1.5MB
Upcoming traffic changes (April 2019) - PDF, 424KB
Upcoming traffic changes (July 2019) - PDF, 396KB
Construction Update Meeting on September 4, 2019 Flyer - PDF, 1.3MB
Route 123 (Chain Bridge Road) South Flyover Ramp Demolition - January 2020, - PDF, 5.6MB
Traffic Pattern Changes for I-66 East to Route 123 North on February 21 - Website
Traffic Changes at Route 123/I-66 Interchange Starting on or about March 21 - Website
Flyer on Rose Forest Drive Closure and Detour (September 2020) - PDF, 1.7MB
Route 123 Bridge Demolition Flyer (December 21, 2020) - PDF, 2MB