I-495 Interchange

The I-66/I-495 Interchange is being modified with several new ramps and connections as part of the Transform 66 Outside the Beltway Project. The new interchange design will:

Add access to and from the existing 495 Express Lanes and the new I-66 Express Lanes
Allow drivers to switch from Express Lanes to General Purpose Lanes – or vice versa – when changing roadways
Replace noise walls in several places at the interchange
Add noise walls along I-66 West near Idywlood Park

Get a closer look at what’s planned through the Transform 66 Interactive Map.

Noise Wall Replacement and Addition Near the I-495 Interchange

Construction of new ramps will require several sections of noise walls to be demolished and rebuilt in the northwest, northeast, and southeast quadrants of the I-495 Interchange. Additionally, a section of older wood noise wall along I-66 East between the ramp from I-495 North and Virginia Lane will be replaced toward the end of the project.

The project final noise analysis identified a section of new noise wall that will be built along I-66 West near the W&OD Trail and Idylwood Park.

Learn more about noise walls and the Transform 66 Project here. Download the final noise analysis report sections covering the I-495 Interchange area below:

Segment 3C FDNA Technical Memo – Southwest Quadrant of I-66/I-495 Interchange - PDF, 11.9MB

Segment 3C FDNA Technical Memo – Southeast Quadrant of I-66/I-495 Interchange - PDF, 6MB

Segment 3C FDNA Technical Memo – Northwest Quadrant of I-66/I-495 Interchange - PDF, 6.5MB

Segment 3C FDNA Technical Memo – Northeast Quadrant of I-66/I-495 Interchange - PDF, 6MB

Construction Update (Updated June 8, 2022)

Recent Construction Progress:

Many bridge piers and abutments have been constructed for future ramp connections
Existing ramps have been shifted for construction of bridge piers
Bridge beams are being installed for new flyover ramps connecting to the future Express Lanes
The W&OD Trail near Idylwood Park has been shifted to its new, permanent location

Upcoming Construction Activities:

Bridge beam installation continues for new flyover ramps, requiring overnight lane closures and traffic stoppages on I-66, I-495, and various ramps
Bridge pier construction continues
Place bridge beams and pour decking for new ramps
Continue replacement and construction of new noise wall

Aerial view of the I-495 Interchange

Aerial view of the I-495 Interchange. (May 17, 2022)

Piers will support new overpasses at the I-495 Interchange. (May 19, 2021)

Piers will support new overpasses at the I-495 Interchange. (May 19, 2021)

Beams have been installed for a new ramp connecting I-495 to the I-66 Express Lanes. (May 19, 2021)

Beams have been installed for a new ramp connecting I-495 to the I-66 Express Lanes. (May 19, 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

What Drivers Can Expect

Drivers should expect traffic shifts and temporary ramp closures as work progresses at the interchange. Sign up for project email updates to keep up to date.

Timeline

Anticipated Schedule	Dates
Ramp and bridge work begins	2018
Various traffic shifts and temporary ramp closures for construction and demolition	2018 through 2022
Bridge beam installation	Summer 2020 through 2022
Demolition of old bridges	2021
Express Lanes open	December 2022

Resources

Temporary Lane Closures on Ramp from I-495 South to I-66 West Starting on or about Thursday, January 28, through Mid-March 2021 - Website

I-495 Partial Bridge Demo Outreach Flyer - April 2021 - PDF, 21MB

I-495 Partial Bridge Demo Outreach Flyer - March 2022 - PDF, 7MB

About the Project

I-495 Interchange