Statement from the Vermont Agency of Transportation

On August 30, 2019 the Vermont Supreme Court affirmed the stormwater permit issued to Vermont Agency of Transportation's Exit 16 DDI project, finding that the project met all applicable stormwater discharge rules and regulations. The project's Act 250 permit was remanded back to the Vermont Superior Court Environmental Division to hear testimony on how the project intends to meet Act 250 Criterion 1 (water pollution). Otherwise, the Vermont Supreme Court affirmed that the project met all remaining Act 250 criteria which were considered by the Environmental Division. 

The Agency of Transportation remains committed to this project and looks forward to addressing traffic congestion, vehicular safety and non-vehicular user accommodation needs in this corridor.

About the Project

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. Other improvements include:

  • Adding turn lanes at the Mountain View Drive, Hercules Drive and Rathe Road intersections.
  • Construction of dedicated pedestrian and shared pedestrian/bicycle facilities.
  • Modernizing traffic signals at South Park Drive, I-89 Exit 16, Mountain View Drive, Hercules Drive, Rathe Road and at Tigan Street in Winooski City.

The current interchange at Exit 16 is a grade separated tight diamond interchange with Interstate 89 crossing over US Routes 2/7 via two bridges. The existing interchange yields frequent traffic congestion, lengthy delays, and significant queuing during peak hours. These existing conditions are a safety concern with a high number of incidents, collisions and a lack of accommodations for non-motorized travel.

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Educational DDI Video

Learn more about a diverging diamond interchange through our educational video.

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