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 Bridge Demolition
Demolition of the old Route 123 bridges over I-66 began in early January. The old Route 123 North bridge will be demolished first, followed by the old Route 123 South bridge. Most of the bridge spans are directly over I-66 and will need to be demolished during overnight hours when multiple lanes can be closed on I-66 to safely accommodate this work. Demolition activities will occur during daytime hours when possible to minimize impacts to nearby communities.
Demolition of the two main bridges is anticipated to occur across an 8- to 12-week time frame, depending on weather and other factors. Demolition activity for each span includes breaking up the concrete bridge deck using jackhammers, sawcutters, and hoe rams, then removing the steel beams using crane lifts. After the bridge deck is demolished, crews will remove the bridge piers and abutments. See flyer for more information.
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 and 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 (Posted February 23, 2021)
Recent Construction Progress:
Upcoming Construction Activities:
Traffic runs in both directions on the new Route 123 North bridge. Crews are making room for ramp connections between Route 123 and the new Express Lanes. (Mar. 1)
Only the center piers remain from the old Route 123 North and South bridges over I-66. They will be demolished later this year. (Mar. 1)
Piers and abutments are being built for the new Route 123 South bridge. (Mar. 1)
Demolition of old Route 123 bridges over I-66 finished in February. Traffic shifted to the new Route 123 bridges in January. (Feb. 17)
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||January 2021|
|Demolition of old Route 123 bridge span||January-March 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|