About the I-495 Andover-Lawrence bridge replacements

Learn more about the project.

Overview

The I-495 Andover-Lawrence Bridge Replacements Project includes six bridges on I-495. The structures are on I-495 where it follows the Andover-Lawrence border. 

I-495 is a vital connector linking eastern Massachusetts to Cape Cod and southern New Hampshire. Private vehicles and heavy trucks delivering freight across the Commonwealth travel this interstate. Route 28 is a regional road that connects homes, businesses, medical care, and educational opportunities. Within the project area, on average, I-495 north and southbound each carry 57,000 vehicles each per day. Route 28, north and southbound each carry an average of 14,700 vehicles per day. 

Beginning in the spring of 2024, MassDOT will fully replace all six bridges. This project allows MassDOT to provide the following improvements to all users:

• New bridges with fewer supports and expansion joints; meaning less impacts to roadway users from maintenance activities.
• Wider bridges that meet modern safety standards with more space on their decks will help to accommodate future maintenance activities.
• Safer acceleration and deceleration lanes for traffic entering and exiting I-495.
• Wider sidewalks and new bicycle lanes on Route 28.

Traffic and construction updates

Work anticipated for the week of June 22^nd to June 29^th 

It is currently anticipated that pile installation with an impact hammer will begin at the bridges carrying I-495 over the MBTA Haverhill Commuter Rail line on the night of Wednesday, June 25th and continue through the night of Friday, June 27th.

I-495 Mainline

Activities

• Installation of mechanically stabilized earth (MSE) walls at the bridges carrying I-495 over Route 28.
• Delivery of materials for the construction of abutments at the bridges carrying I-495 over Route 28.
• Preparatory earthwork in the median work zone for future crossover lanes.

Traffic Impacts by Time of Day

• For installation of MSE walls at the bridges carrying I-495 over Route 28: closure of the left and middle lanes of I-495 northbound (towards Haverhill) beginning at 11:00 PM on Sunday, June 22^nd with all lanes reopened to traffic on Monday, June 23^rd by 5:00 AM. This closure will repeat during the same overnight hours on the following nights:
  • Monday, June 23
  • Wednesday, June 25
  • Thursday, June 26
  • Friday, June 27
• For the delivery of materials for abutments at the bridges carrying I-495 over Route 28: closure of the left and middle lanes of I-495 southbound (towards Lowell) beginning at 10:00 PM on Tuesday, June 24^th with all lanes reopened to traffic by 4:00 AM on Wednesday, June 25^th.
• For preparatory earthwork: all work will take place from 7:00 AM to 3:00 PM, Monday, June 23^rd through Saturday, June 28^th, behind barrier without lane closures.
• Motorists should be aware that trucks will enter and exit the work zone under the supervision of a State Police detail.  All drivers should exercise caution, reduce speed, and pay attention to temporary traffic controls, police details, and project personnel while traversing the project site. 

Noise impacts:

• Noise levels will be similar to normal traffic operations both at night and during the day with machinery operating to move earth within the median work zone, deliver materials, and construct MSE walls.

Surrounding Interchanges

Activities

• There is no work planned for the surrounding interchanges during the week addressed by this lookahead.

Route 28

Activities

• Preparatory excavation for the installation of MSE (mechanically stabilized earth walls) at the I-495 bridges over Route 28.
• Installation of MSE walls at the I-495 bridges over Route 28.

Traffic Impacts by Time of Day

• For preparatory excavation for the installation of MSE walls, closure of Route 28 northbound (towards Lawrence) beginning at 10:00 PM on Sunday, June 22^nd with all lanes reopened to traffic by 4:00 AM on Monday, June 23^rd.  This closure will repeat during the same overnight hours, Monday, June 23^rd through Friday 27^th. This closure will also cause the following detours:
  • Motorists seeking to travel south on I-495 from Route 28 northbound (ramp D) may:
    • Enter I-495 northbound Haverhill Salisbury
    • Remain in the right lane on I-495
    • Take Exit 100 B 114 West S. Lawrence
    • Prepare to merge left at the bottom of the ramp
    • Use the signalized left lane to enter I-495 southbound Lowell Marlboro
  • Motorists seeking to access Route 28 northbound from I-495 northbound (ramp E) may:
    • Remain on I-495 northbound
    • Take Exit 100 B 114 West S. Lawrence
    • Take Route 114 north towards Lawrence
    • Turn left off Route 114 (locally Winthrop Avenue) onto Andover Street
    • Turn right off Andover Street onto Route 28
  • Motorists seeking to continue north on Route 28 may:
    • Turn right off Route 28 onto Haverhill Street
    • Turn left off Haverhill Street onto Route 114 (locally Winthrop Avenue)
    • Turn left off Route 114 onto Andover Street
    • Turn right off Andover Street onto Route 28
  • Motorists seeking to travel north on I-495 should access the interstate from the I-93 or Route 114 interchanges.
  • During the closure of Route 28 under I-495, traffic that would normally travel along Route 28 southbound and then reverse direction to access destinations on Binney or Shepley Streets will not be able to do so.  To maintain access to these residential areas, the section of Route 28 locally known as South Union Street will operate in a two-way condition under control of police details between 10:00 PM and 4:00 AM each night of the closure. One police detail will be stationed approximately just to the south of Binney Street, the other approximately where Route 28 splits into South Union Street and South Street.   
• For the installation of MSE walls: closure of the left lane of Route 28 northbound (towards Lawrence) and southbound (towards Andover) where it passes below I-495, 7:00AM to 3:00PM from Monday, June 23^rd to Saturday, June 28^th. Closures may alternate between the right and left lanes depending on the day and operational needs. More than a single lane will not be closed during daytime operations.
• Motorists entering Route 28 from I-495 north and southbound should exercise additional caution when merging. All motorists traveling through the Route 28 work zone are advised to reduce speed, exercise caution, and pay close attention to all signage and directions from police and project personnel. Rolling roadblocks may occur to shift construction machinery across Route 28. 

During the closure of Route 28 under I-495, traffic that would normally travel along Route 28 southbound and then reverse direction to access destinations on Binney or Shepley Streets will not be able to do so. To maintain access to these residential areas, the section of Route 28 locally known as South Union Street will operate in a two-way condition under control of police details between 10:00 PM and 4:00 AM each night of the closure. One police detail will be stationed approximately just to the south of Binney Street, the other approximately where Route 28 splits into South Union Street and South Street.

Noise impacts:

• Noise levels will similar to normal traffic operation with equipment running to place MSE wall panels and move earth.

Lay-Down Area

Activities

• Receipt of materials, equipment, and gathering point for work crews and Massachusetts State Police details before entering the I-495 mainline.

Traffic Impacts by Time of Day

• Single vehicles entering and exiting the lay-down area under yield control from 7AM-3PM throughout the week covered by this look-ahead.
• Multiple vehicles entering and exiting the lay-down area under State Police control during the overnight hours, between 7:00 PM and 5:00 AM depending on the exact date within the period covered by this look-ahead. 

Noise Impacts

• None

MBTA Haverhill Commuter Rail Line

Activities

• Installation of SOE (Support of Excavation) piles and lagging (bracing) at the bridges carrying I-495 over the MBTA Haverhill line.

Traffic Impacts by Time of Day

• Installation will occur outside commuter rail operating hours without impacts to rail passengers.

Noise Impacts

• From Sunday, June 22^nd through Tuesday, June 24^th, SOE piles will be installed with a vibratory hammer. Installation will be substantially quieter than the recently completed impact installation at the bridges over Route 28.
• Beginning on Wednesday, June 25^th through Friday, June 27^th, SOE piles will be installed with an impact hammer. The noise impact of installation will be similar to the recently completed work at the bridges over Route 28. 

Completed Work

I-495 Mainline

• Impact pile installation at the bridges carrying I-495 over Route 28 northbound: 95%
• Installation of MSE walls at the bridges carrying I-495 over Route 28 northbound: 60%
• Installation of MSE walls at the bridges carrying I-495 over Route 28 southbound: 10%
• Installation of SOE piles and lagging at the bridges carrying I-495 over the MBTA Haverhill Commuter Rail Line: 60%
• Preparatory earthwork in the median work zone for future crossover lanes: 60%

Construction timeline

Construction will be staged to reduce impacts on abutters and commuters. The project is expected to run roughly four years and is broken into four, broad stages:

• Stage 1: Summer 2024 – Fall 2025
  • Work in the median to create new roadway and bridge deck space.
  • Construction of median crossovers.
• Stage 2: Fall 2025 – Fall 2026
  • Northbound lanes of I-495 shifted into the median
  • Work to rebuild bridges takes place in the vacated northbound lanes.
• Stage 3: Fall 2026 – Summer 2027
  • Southbound lanes of I-495 shifted to the median
  • Northbound lanes of I-495 shifted to the final alignment
  • Work to rebuild bridges takes place in the vacated southbound lanes.
  • Cycling and pedestrian improvements open on Route 28
• Stage 4: Summer 2027 – Fall 2027
  • Traffic shifted to the final alignment in both north and Southbound directions.
  • Improved acceleration/deceleration lanes in place.
  • Median area vacated.

Project-associated detours and periodic lane closures

Some short-term, overnight detours are part of this project. These detours use main roads such as Haverhill Street (Route 133) and Turnpike Road (Route 114) to keep traffic off local streets and help maintain quality of life for area residents and access for area businesses. There will times when two-way traffic will run temporarily on normally one-way sections of Route 28 in the vicinity of Binney and Shepley streets. Homes and businesses on these streets will receive flyers in advance of the change of direction.

All detours and lane closures will be noticed using the project’s website and mass email system. The project will avoid lane closures and detours during peak commuting hours to help keep traffic flowing.

Committed to being good neighbors

The bridges over Route 28 and MBTA are closely surrounded by the community. Some homes in Andover are less than 400 feet from I-495. MassDOT is committed to minimizing, managing, and communicating construction impacts effectively while it completes this needed work.

To help the project be a better neighbor we will:

• Stage construction to provide a normal, simple configuration on I-495 with three lanes in each direction. During the design process, community members may have seen plans that split the lanes of one direction of the highway up with a work zone between them. By creating a work zone in the median of the highway first, we can create adequate space to build the new bridges and keep each direction of the highway as it normally is with three travel lanes together in each direction. This helps to prevent driver confusion and allows a smoother traffic flow.
• Provide real time traffic monitoring on I-495 to help keep regional traffic on the highway and off local streets.
• Avoid lane closures on Route 28 and I-495 during commuting peaks.
• Implement detours which rely on larger roadways such as I-495 itself, Route 133, and Route 114.
• Wet the old bridge’s supports during demolition to prevent dust from reaching nearby homes and businesses.
• Communicate real time traffic information changeable message signs. These signs are solar powered, making them quieter and better for the environment.
• Issue weekly email and web-based updates to keep all users informed about project progress, detours, and other roadway conditions. We will send emails to subscribed individuals, but also to partners who can help us get our message out ranging from local officials to local transit provider MEVA, area schools, social service organizations and more.
• Offer a project hotline in English, Spanish, and Vietnamese. MassDOT will activate the hotline in the spring of 2024.