Vermont’s First Diverging Diamond Interchange

The Vermont Agency of Transportation (VTrans) is improving the roadway along the U.S. Routes 2/7 (U.S. 2/7) corridor, in the vicinity of Interstate 89 (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 U.S. 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

Weekly Construction Update

TRAFFIC IMPACT AND DURATION: Early next week, there is the potential for intermittent shoulder or lane closures between the hours of 9:00 a.m. and 4:00 p.m. to facilitate the installation of construction signage and mobilization of construction equipment. Starting midweek, there will be closures of the outermost lanes on U.S. 2/7 in both directions between the hours of 9:00 a.m. and 4:00 p.m. to allow crews to begin removing material behind the bridge piers.

CONSTRUCTION ACTIVITIES: Early next week, crews will continue installing advance warning construction signage throughout the area and mobilizing construction equipment. Starting midweek, crews will begin removing material including ledge from behind the bridge piers on both sides of interstate bridges over US 2/7 to facilitate the installation of retaining walls. This will include hammering to break up the ledge for removal. This work will be completed under lane closures.

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Construction Public Meeting Materials are NOW Available!

The Vermont Agency of Transportation (VTrans) held a Construction Public Meeting for the Exit 16 Diverging Diamond Interchange (DDI) Project on Thursday, January 12, 2023. The Construction Public Meeting included a presentation comprised of an overview of the project, the construction schedule and sequence, the anticipated impacts, and information about future blasting activities. A copy of the presentation can be found here or under presentations on the Documentary Library tab of the website!

Representatives from the project team, the contractor, S.D. Ireland Brothers Corp., and the blasting subcontractor, Maine Drilling & Blasting addressed comments and questions provided by attendees. A recording of the Construction Public Meeting can be found here or under presentations on the Documentary Library tab of the website!

Exit 16 DDI Winter Newsletter Released

No matter how you celebrate, the Exit 16 DDI Project Team would like to wish you and your loved ones a safe and happy holiday season!

The Winter 2022-2023 Exit 16 DDI Project Newsletter is now available. The newsletter includes project updates, winter travel safety tips and more! Check out the Winter 2022 Newsletter

Project Updates

Construction of the Exit 16 DDI project will be completed in two phases under two separate construction contracts which will be executed sequentially. The project has been approved for winter work and construction on the initial phase will begin as early as the last week of January 2023. Phase 1 construction will consist of utility relocation, waterline replacement, utility duct bank installation, retaining wall construction, and some ledge removal.

The construction public meeting will be held in early to mid January and including a presentation on the project overview, construction schedule and sequencing, the anticipated impacts, and information about future blasting activities with the opportunity to ask questions of the project team and contractor. Additional information including the exact time, date, and location will be shared in supplemental notices as the information becomes available.

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The Exit 16 Diverging Diamond Interchange (DDI) Project Team is excited to announce that construction of the Exit 16 DDI Project is coming!

In August 2022, the Vermont Agency of Transportation awarded the construction contract for Phase 1 of the Exit 16 DDI Project to S.D. Ireland Brothers Corporation. The construction contract was awarded at an estimated cost of approximately $7.5 million. Work in Phase 1 will include utility relocation, waterline replacements, telecommunications duct bank installation, ledge removal, and the construction of the retaining walls.

The construction of Phase 1 was anticipated to begin this fall; however, the start of construction has been postponed. The postponement is due to the contractor being assigned to an emergency culvert repair/replacement project in Richmond, VT requiring staff and other resources to be redirected to that effort.

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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