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.

Project Updates
Weekly Construction Update 5/26/2023
DATE: Friday, May 26, 2023
SPECIAL CIRCUMSTANCES:
Crews will be offsite starting Friday, May 26, at noon in observance of Memorial Day. Crews will return on Monday, May 29, at 7:00 p.m.
TRAFFIC IMPACT AND DURATION:
Starting Monday, May 29, at 7:00 p.m. and continuing through Friday, June 2, at 6:00 a.m. during nighttime hours (7:00 p.m. - 6:00 a.m.), crews will continue installing waterline starting near the Interstate 89 (I-89) northbound onramp towards Mountain View Drive and working their way north along U.S. Route 2/7 (U.S. 2/7). Crews will also prepare for daily blasting operations beginning at 6:30 a.m. Utility work is anticipated to begin in the Mountain View Drive intersection by Thursday, June 1. At least one travel lane will remain open in each direction during nighttime hours. Motorists are strongly encouraged to use caution while driving through the work zone and pay close attention to signage as traffic patterns will change.
Crews will continue removing material including the roadway surface and ledge to facilitate the installation of the waterline and stormwater utilities. This will continue through next week starting Tuesday, May 29, through Friday, June 2, during daytime hours (6:30 a.m. - 7:00 a.m. and 9:00 a.m. - 2:00 p.m.) along U.S. 2/7 between Whitcomb Street and Mountain View Drive. This work will require blasting. Crews will continue to work on the waterline and stormwater utilities along U.S. 2/7 between the I-89 northbound onramp and Mountain View Drive. This work will require the closure of the two outermost southbound lanes along the west side of U.S. 2/7. Utility work is anticipated to begin in the Mountain View Drive intersection by Thursday, June 1. Traffic will be shifted to allow for two travel lanes to remain open in each direction during daytime hours. Traffic patterns will change. This work will be completed under lane closures on U.S. 2/7 between the hours of 6:00 a.m. and 3:00 p.m.
CONSTRUCTION ACTIVITIES:
Throughout the week, during nighttime hours (7:00 p.m. and 6:00 a.m.), crews will be installing waterline along U.S. 2/7 between the I-89 northbound onramp and Mountain View Drive. On Wednesday, May 31, there will be a temporary water service disruption to facilitate waterline work. The service disruption will take place at night between the hours of 11:00 p.m. and 5:00 a.m. All impacted businesses and residents will be notified.
Throughout the week, during daytime hours (6:00 a.m. and 3:00 p.m.), crews will continue trench work along U.S. 2/7 between the I-89 northbound onramp and Mountain View Drive to facilitate waterline installation. Crews will continue trench work along the west side of U.S. 2/7 outside of the roadway to facilitate stormwater infrastructure installation. This work will require the removal of subsurface ledge and will require blasting.
Blasting activities are anticipated to occur twice a weekday between the hours of 6:00 a.m. – 7:00 a.m. and 9:00 a.m. – 2:00 p.m. A blasting event will occur at each location as described above.
Please check the Exit 16 DDI project website or interactive map for daily updates on blasting locations, local impacts, and estimated blasting windows. For more information on blasting activities, click here.
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DAILY BLASTING UPDATE
DAILY BLASTING UPDATE
A blast is anticipated to take place TODAY, FRIDAY, May 26, at 6:30 a.m. along U.S. Route 2/7 (U.S. 2/7) outside of the roadway in the vicinity of the Interstate 89 (I-89) northbound onramp to facilitate the installation of stormwater infrastructure. Please note, anticipated blast times are estimated and subject to change based on site conditions.
Audible signals will be used to notify the public of an upcoming blasting event which includes three whistles to indicate a five-minute warning, two whistles to indicate a one-minute warning, and one whistle to indicate the all-clear. The all-clear will be followed by the blasting event.
For more information on blasting activities, click here.
TRAFFIC IMPACTS:
This work will require the closure of the outermost southbound lane on U.S. 2/7.
Traffic will be temporarily impacted on U.S. 2/7 and the Interstate 89 (I-89) Exit 16 on and off-ramps will be temporarily closed.
U.S. Route 2/7
Four minutes prior to each blasting event, Uniformed Traffic Officers (UTOs) and barricades will be placed at either end of the blasting zone on U.S. 2/7 and the I-89 offramps to prevent vehicles, pedestrians, and cyclists from entering the blasting zone. The blasting zone is anticipated to be between South Park Drive and Mountain View Drive, however, this area will be refined based on the specific blasting location. Flaggers will be present at adjacent businesses and sideroads to prevent pedestrians, cyclists, and vehicles from entering the area. Once the area is secured, the blasting event will take place. After each blasting event, a blasting specialist will clear the area before allowing users to reenter the blasting zone. The I-89 interstate offramps will be cleared before U.S. 2/7 traffic is released. Wait times are not anticipated to exceed 10 minutes.
Interstate 89
Four minutes prior to each blasting event, UTOs and SDI construction vehicles will initiate a rolling roadblock between Exit 14 and 17 along I-89 northbound and southbound. Rolling roadblocks slow traffic down to create a gap in traffic to allow the blasting event to take place safely. A pilot vehicle will follow the last vehicle impacted by the rolling roadblock to inform the team once the area in the blasting zone is secured. The rolling roadblock will continue until the hard stop location is reached. To learn more about rolling roadblocks, watch this video created by the Kansas Turnpike.
All users should expect delays and plan ahead.
Reminder, crews will be offsite starting TODAY, Friday, May 26, by noon in observance of the Memorial Day Holiday. Crews will return Monday, May 29, at 7:00 p.m.
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Weekly Construction Update 5/19/2023
DATE: Friday, May 19, 2023
SPECIAL CIRCUMSTANCES:
Blasting hours have been extended to allow for additional blasting operations between 6:30 a.m. and 7:00 a.m. This extension allows crews to prepare for daily blasting operations during off-peak hours when traffic volumes are low.
Crews will be offsite starting Friday, May 26, at noon in observance of Memorial Day. Crews will return on Monday, May 29, at 7:00 p.m.
TRAFFIC IMPACT AND DURATION:
Starting Sunday, May 21, at 7:00 p.m. and continue through Thursday, May 25, at 6:00 a.m. during nighttime hours (7:00 p.m. – 6:00 a.m.), crews will continue installing waterline working their way north along U.S. Route 2/7 (U.S. 2/7) towards Mountain View Drive. Crews will also prepare for daily blasting operations beginning at 6:30 a.m. At least one travel lane will remain open in each direction during nighttime hours. Motorists are strongly encouraged to use caution while driving through the work zone and pay close attention to signage as traffic patterns will change.
Crews will continue removing material including roadway surface and ledge to facilitate the installation of the waterline and stormwater utilities will continue throughout next week starting Monday, May 22, through Friday, May 26, at noon during daytime hours (6:30 a.m. – 7:00 a.m. and 9:00 a.m. – 2:00 p.m.) along U.S. 2/7 within the project area. This work will require blasting activities. Throughout the week, crews will continue to work in the center lanes in the vicinity of the Interstate 89 (I-89) bridges. Two travel lanes will remain open in each direction during daytime hours. Traffic patterns will change. This work will be completed under lane closures on U.S. 2/7 between the hours of 6:00 a.m. and 3:00 p.m.
CONSTRUCTION ACTIVITIES:
Throughout the week during nighttime hours, crews will be installing water line along U.S. 2/7 at the I-89 interstate bridges working their way north.
Throughout the week, crews will continue trench work along U.S. 2/7 within the center lanes along U.S. 2/7 at the I-89 interstate bridges working their way north. This work will require the removal of subsurface ledge and will require blasting.
Blasting activities are anticipated to occur twice a weekday between the hours of 6:00 a.m. – 7:00 a.m. and 9:00 a.m. – 2:00 p.m. A blasting event will occur at each location as described above.
Please check the Exit 16 DDI project website or interactive map for daily updates on blasting locations, local impacts, and estimated blasting windows. For more information on blasting activities, click here.
Read more
Traffic Alert 5/17/2023
Blasting Hours Extended Starting TOMORROW, Thursday, May 18 in Colchester, VT
Starting TOMORROW, Thursday, May 18, blasting hours will be extended to allow for additional blasting operations between 6:30 a.m. and 7:00 a.m. This extension will allow crews to prepare for daily blasting operations during off-peak hours when traffic volumes are low. Blasting activities will continue throughout next week along U.S. Route 2/7 (U.S. 2/7) within the project area. Blasting activities will be restricted between the hours of 6:30 a.m. and 7:00 a.m. and 9:00 a.m. and 2:00 p.m. outside of peak traffic hours. Crews will continue blasting along U.S. 2/7 starting just north of Whitcomb Street and working north.
This work will require lane closures along U.S. 2/7. Between the hours of 6:30 a.m. and 7:00 a.m. at least one travel lane will remain open in each direction. Between the hours of 7:00 a.m. and 3:00 p.m. crews will close a maximum of one lane in each direction. In addition, traffic will be temporarily impacted on U.S. 2/7 and I-89 as part of the blasting activities; more specific information is provided below. These impacts will be restricted between the hours of 6:30 a.m. and 7:00 a.m. and 9:00 a.m. and 2:00 p.m., Monday through Friday.
Please check the Exit 16 DDI project website or interactive map for daily updates on blasting locations, local impacts, and estimated blasting windows. For more information on blasting activities, click here.
U.S. Route 2/7
Four minutes prior to each blasting event, Uniformed Traffic Officers (UTOs) and barricades will be placed at either end of the blasting zone on U.S. 2/7 and the I-89 offramps to prevent vehicles, pedestrians, and cyclists from entering the blasting zone. The blasting zone is anticipated to be between South Park Drive and Mountain View Drive, however, this area will be refined based on the specific blasting location. Flaggers will be present at adjacent businesses and sideroads to prevent pedestrians, cyclists, and vehicles from entering the area. Once the area is secured, the blasting event will take place. After each blasting event, a blasting specialist will clear the area before allowing users to reenter the blasting zone. The I-89 interstate offramps will be cleared before U.S. 2/7 traffic is released. Wait times are not anticipated to exceed 10 minutes.
Interstate 89
Four minutes prior to each blasting event, UTOs and SDI construction vehicles will initiate a rolling roadblock between Exit 14 and 17 along I-89 northbound and southbound. Rolling roadblocks slow traffic down to create a gap in traffic to allow the blasting event to take place safely. A pilot vehicle will follow the last vehicle impacted by the rolling roadblock to inform the team once the area in the blasting zone is secured. The rolling roadblock will continue until the hard stop location is reached. To learn more about rolling roadblocks, watch this video created by the Kansas Turnpike.
All users should expect delays and plan ahead.
Read moreDriving Animations
Experience Exit 16 DDI