Vermont’s First Diverging Diamond Interchange

The Vermont Agency of Transportation (VTrans) is improving the roadway along the US Routes 2/7 corridor, in the vicinity of I-89 Exit 16, to enhance mobility and safety in Colchester, Vermont. The project area extends from in the Colchester-Winooski town line north for approximately 1 mile to just beyond the intersection of Sunderland Woods Road at US Route 2/7. The core of the project is to reconfigure the existing tight diamond interchange to a Diverging Diamond Interchange at I-89 Exit 16.

Learn more about this and other improvements

Image of Interchange

Project Updates

Updated Project Schedule Announced

VTrans has announced an updated schedule for the Exit 16 Diverging Diamond Interchange (DDI) project.

The bid advertisement and the contract award are planned for Spring 2022. Once awarded, phase one of construction can be begin, which includes utility relocation, ledge removal, and the construction of a retaining wall and shared-use path. Phase two will begin in 2023 and includes construction of the new DDI.

Visit the Project Overview page for more information. 

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Act 250 Ruling

On November 6, 2020, the Vermont Supreme Court affirmed in favor for the State of Vermont a decision to issue an Act 250 permit for the Vermont Agency of Transportation’s (VTrans) Exit 16 DDI project after challenges to its previous issuance by the Natural Resources Board’s District #4 Environmental Commission. This decision and affirmation is welcomed by VTrans, the Vermont Agency of Natural Resource and the Natural Resources Board, and reinforces VTrans’ desire and ability to improve transportation conditions for all users along this regionally important corridor while being environmentally sensitive to the project area, Sunnyside Brook and Lake Champlain.

Local News: VTrans aims to get drivers used to I-89 Exit 16 changes with interactive website

As the Vermont Agency of Transportation moves forward with longstanding plans to reconfigure the Route 7 corridor near I-89 Exit 16, the agency is urging Vermonters to take a close look at the incoming changes on a new interactive website.

The project area extends from in the Colchester-Winooski town line north for approximately 1 mile, to just beyond the intersection of Sunderland Woods Road. The multi-year project, scheduled to begin Summer 2022, will eventually reconfigure the existing tight diamond interchange to a Diverging Diamond Interchange at I-89 Exit 16.

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Welcome to the New Exit 16 DDI Website!

Welcome! The Exit 16 Diverging Diamond Interchange (DDI) Project Team is excited to share our newly redesigned project website. The new website offers an interactive, easy-to-navigate interface that provides information about the new roadway design, which will be built along the US Routes 2/7 corridor, in the vicinity of I-89 Exit 16, in Colchester, Vermont.

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Driving Animations

Experience Exit 16 DDI

Driving simulation traveling on US 2 West / 7 North through the DDI

Aerial view of the operating diverging diamond interchange at I-89 Exit 16

Driving simulation exiting I-89 onto US 2 East/7 South via Exit 16

Driving simulation traveling on US 2 East/7 South through the DDI

Driving simulation exiting I-89 onto US 2 West / 7 North via Exit 16