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:
Get a closer look at what’s planned through the Transform 66 Interactive Map.
Route 123 (Chain Bridge Road) northbound and southbound traffic has shifted to the new Route 123 North Bridge over I-66. 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.
As construction continues through 2022 on the Route 123/I-66 Interchange, drivers should be alert for changing traffic patterns. Drivers are reminded to slow down and pay attention to lane markings and roadway signs at all times.
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 July 12, 2021)
Recent Construction Progress:
Upcoming Construction Activities:
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)
Piers and abutments for the new Route 123 South Bridge over I-66 are shown in this photo. Since this photo was taken, bridge beams have been installed for the new span. (May 2, 2021)
What Neighbors Can Expect
|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|
|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|