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About the Project

Route 123 Interchange

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

  • Provides access to and from the future 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 at what’s planned through the Transform 66 Interactive Map.

Traffic Changes at Route 123/I-66 Interchange

Drivers heading from Route 123 (Chain Bridge Road) South to I-66 West will now use a new left-turn lane and traffic signal to reach a temporary access ramp to the interstate. This detour is anticipated to be in place through March 2022, while crews construct the new, permanent ramp from southbound Route 123 to I-66 West.

Route 123 South to I-66 West

  • The current ramp from Route 123 South to I-66 West is closed.
  • Drivers are now directed to continue south beyond the old access ramp and stay to the left. At the signalized intersection with the ramp from I-66 West, drivers will turn left from a dedicated left-turn lane to reach a newly constructed ramp that merges into the current ramp from Route 123 North to I-66 West (see graphic below).
  • There are be two travel lanes on Route 123 North and South through the interchange.
  • Drivers traveling from Route 123 North to I-66 West should stay alert for traffic merging onto the ramp from the left. Detoured drivers merging from the temporary ramp connection onto the ramp from Route 123 North are be required to yield to vehicles already on the ramp.

 

New Permanent Loop Ramp from Route 123 (Chain Bridge Road) North to I-66 West Now Open

The new permanent loop ramp from Route 123 (Chain Bridge Road) North to I-66 West opened Tuesday night, November 2. The new ramp is on the right side of the roadway near the previous loop ramp’s location. The temporary left-turn and connector ramp from Route 123 North to I-66 West is now closed and drivers will no longer be able to make a left turn at the temporary traffic signal to reach I-66 West. 

Route 123 (Chain Bridge Road) Traffic Shifted to New Bridge Over I-66

Route 123 northbound and southbound traffic shifted to the new Route 123 North Bridge over I-66 in winter 2021. The old Route 123 North and South bridges are being demolished to allow for construction of a new Route 123 South Bridge, shared-use path, and new ramps to I-66 general purpose and Express Lanes.

Access to and from I-66 at Route 123 will remain in its current configuration during this phase of construction.

The travel lanes of southbound Route 123 over I-66 shifted on to the new Route 123 Bridge on Jan. 21. Access to/from I-66 East and West will remain the same. 

Construction Update (Updated November 30, 2021)

Recent Construction Progress:

  • Box culverts have been installed for shared-use path through the interchange
  • All I-66 East lanes have been shifted to new pavement on the right side (outer portion) of the roadway between Jermantown Road and Blake Lane as construction activities begin to focus on building the future I-66 Express Lanes in the center of the roadway  
  • Route 123 traffic over I-66 has shifted to the new Route 123 North Bridge (Northbound shifted on Dec. 30, 2020; Southbound shifted on Jan. 21, 2021)
  • Demolition of the old Route 123 bridges over I-66 is complete 
  • Beams and deck have been installed for the new Route 123 South bridge
  • The new Route 123 North to I-66 West loop ramp opened Nov. 3, 2021

Upcoming Construction Activities:

  • Construction of approaches to and remainder of the new Route 123 South Bridge
  • Open new Route 123 South to I-66 East loop ramp
  • Construct new Route 123 South to I-66 West ramp
  • Overnight demolition of the remaining bridge piers along I-66
  • Shift Route 123 South traffic to new bridge
  • Open Express Lanes and new ramps


Bridge deck is being constructed for the new Route 123 South bridge. (July 12, 2021)


Looking west toward the I-66 East travel lanes, which have been shifted to new pavement on the outside of the roadway to allow construction of new express lanes ramps. (July 12, 2021)


Looking east from the Route 123 bridge toward a new storm water pond and the I-66 East travel lanes, which have been shifted to new pavement on the outside of the roadway. (July 12, 2021)


The new Route 123 South bridge over I-66 is nearly complete. Work is advancing on two new loop ramps from Route 123 to I-66. I-66 travel lane shifts continue in the Route 123 area as construction progresses on new ramps in the center portion of the corridor. (September 24, 2021)

What Neighbors Can Expect

  • Noisy construction activities such as bridge demolition and pile driving will be avoided at night, when possible. Noise to expect at night includes back-up alarms on equipment and trucks, which is necessary to protect worker safety.
  • Lighting of the construction work area will be directed to minimize light pollution for nearby residents.
  • Project emails and website will be used to communicate major traffic switches or nighttime work.

Timeline

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 open December 2022

Resources

Concept plans (I-66) - PDF, 13.7MB
Concept plans (Rt. 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 - Jan, 2020, - PDF, 5.6MB
Traffic Pattern Changes for I-66 East to Route 123 North on Feb. 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 (Sept. 2020) - PDF, 1.7MB
Route 123 Bridge Demolition Flyer (12/21/20) - PDF, 2MB