Project Overview

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.

The project is estimated to cost approximately $14 million and is scheduled to be advertised for contractor bid and awarded in Spring 2022. Construction is anticipated to begin in Summer/Fall 2022 and will be completed in Spring 2025. The first construction season will consist mainly of utility relocation, ledge removal, and drainage work with the bulk of the roadway construction including the installation of the DDI, the addition of the turning lanes, and the implementation of the pedestrian and bicycle accommodations taking place the following construction seasons.

Prior to and throughout construction, educational materials will be provided at the Town offices and distributed at local community events in the greater Colchester area to prepare the traveling public for changes in traffic patterns resulting from the construction of the DDI. Educational materials can also be found on this website in the Document Library.

VTrans' comprehensive communications and public outreach program will keep the public informed throughout the life of the project and beyond as drivers learn to navigate the new interchange.

This website provides up-to-date project information. Additional sources of information include:

  • Public information meetings
  • Information kiosks located at the Colchester and Winooski City Town Offices, along with the Williston I-89 Northbound Rest Area. More locations may be added.
  • Project and weekly Construction Updates. Join our mailing list here.


Project Milestones

  1. September 28, 2012

    • Preliminary Plans

  2. November 28, 2016

    • Permitting

  3. Q1 2022

    • Right of Way Clear

  4. Q2 2022

    • Bid Advertisement, Contract Award

  5. Q3 & Q4 2022

    Phase 1 Construction

    • Utility Relocations
    • Ledge Removal
    • Retaining Wall Construction
    • Shared-Use Path Construction

  6. Q1 2023 to Q2 2025

    Phase 2 Construction

    • Roadway Construction