Engineering Construction Projects

Road Construction, Closures, and DetoursWhile every effort is made to keep this website up to date, changes occur dynamically and website updates cannot keep up with moment to moment conditions. This applies to detours which are set daily in the field by Town personnel in conjunction with the Lexington Police Department.

Projects Under Construction

Non-Town of Lexington Projects

The Mass. Water Resources Authority (MWRA) is working on Lowell Street at Summer Street, and there is a partial road closure/truck detour. Work will continue until December 9th at which time it will wrap for the season. The Town of Burlington project on Lowell St has wrapped up for the season. Both projects kick off again in April, 2023. The Town Of Lexington working with the MWRA will be making water system improvements in parts of Lowell Street  as well beginning in 2023.

See the bottom of the page for other important Non-Town related construction information including road closures related to those projects.

Town of Lexington Projects

Center Streetscape Project was completed in November, 2022. Punchlist and extra work will be done in Spring of 2023. Please visit the Center Streetscape Project webpage for details and schedule when available. 

Battle Green Streetscape Project begins April, 2023 and has a dedicated webpage! Battle Green Streetscape webpage.

  • 2023 Paving Program (Updated March 28, 2023):  to view 2023 Paving Map
    Fog Seal - A fog seal is a thin liquid layer applied to the surface of a paved road in relatively good condition. The intent of this treatment is to seal the pavement, rejuvenate, restore the wearing surface and provide resistance to deterioration due to the weather and sun.  Subsequent to a Fog Seal the cracks are sealed with a liquid asphalt sealer. This treatment will extend the life of the pavement. This is classified as preventive maintenance.

    Crack Sealing - Crack sealing is the placement of a sealant material into cracks of an existing pavement surface to prevent excess water and moisture from penetrating the asphalt. This is a preventative measure to keep the road from deteriorating further. Crack Sealing can be done as a stand alone treatment or in conjunction with other treatments listed below.

    Double Microsurfacing (aka DM or micro) - A microsurface is a thin layer (3/16”) preventative maintenance treatment applied to an existing paved surface in either one or two layers. This treatment adds a tough wearing coat that will seal and protect the existing pavement and give it a new friction course. In Lexington this treatment is generally done in two applications. The second application will usually occur next good weather day after the first application. 

    Cape Seal - A complete Cape seal application is done in several steps.  First a full width coating of chip seal material is applied. The chip seal has a surface that can be driven on for a short time and it is rougher than standard asphalt. It has some loose chips. About a week after the chip seal, the roads will receive a microsurface coating. The finished microsurfaced road will be very similar to a standard paved surface. The “Cape Seal” term describes the complete multi-layer treatment.

    For Double Microsurfacing and Cape Sealing, prep work includes crack sealing, patching sections of existing pavement, adjusting manholes, catch basins and other iron structures to future finished grade, minor drainage improvements, and milling. This prep work may be done a month or more before the actual treatment is completed. 

    Mill and Overlay - The existing pavement has 0.5 to 2 inches of the surface ground off.   This treatment removes the existing deteriorated wearing surface and leaves the substructure intact.  Then the installation of new pavement follows the Overlay description above.  It is not uncommon for two layers to be installed after milling of the pavement.

    Cold-In-Place Recycling - Cold-in-place recycling is a preservation technique for reusing the existing road material to create a new roadway surface. The old road is ground up, mixed with some additives, and immediately placed back down on the road. Additives are based off a specific mix design. After one week or more a wearing surface will be put on top of the new road, making it look very similar to a typical paved surface. All structures (catch basins, manholes, and water and gas gates) will have to be reset for this treatment. 

    Reclamation - This treatment is intended for a roadway that has outlived it useful life. It is considered to be the most aggressive resurfacing treatment.  The entire pavement structure is completely pulverized to depth of 14” to 20”.  Most of the pulverized material is reused as a subbase for the asphalt paving.   Additional material may be required to be blended in the subbase to meet specifications.  After the subbase is installed a minimum of 4” of asphalt is installed in multiple layers.  

  • Valleyfield, Grassland, and Waltham Streets Drainage Improvements Project (Updated March 3, 2023) The project includes storm drain improvements, culvert replacement, and related work on Valleyfield Street, Grassland Street, and Waltham Street near Brookside Avenue. Also included in this project is the traffic lights upgrade on Waltham Street at Brookside Avenue. Any questions can be directed to the email of Marissa Liggiero.
  • Oxbow Road and Constitution Road Drainage Improvements Phase 1 (Updated December 20, 2022) Kiln Brook Culvert Daylighting Project includes drainage improvements in front of 27/29 Constitution road and includes daylight an existing outfall, installing a culvert, roadway infrastructure improvements and wetland improvements. Phase I is now complete and being monitored. Phase II is expected to take place in 2023. This phase will include increasing drainage pipe sizes on Oxbow Rd, and installing a new section of drain line and drainage structures on Oxbow and Constitution Rd. Minor traffic implications are expected during construction. Plans and more project information will be available soon. Please email Matt Weisman or email Ross Morrow if you have questions in the meantime. 
  • Phase 9 Sewer System Improvements (Updated March 3, 2023) This project includes sewer repairs and rehabilitations for both structural and infiltration related defects. Infiltration is clean water from below the ground (groundwater) that enters the sewer system through defective pipes and structures. This “clean” water takes up valuable space and capacity in the sewer pipes that would normally be available for wastewater. It can cause the pipe and service conditions to back-up and potentially overflow during extreme wet weather conditions, and it costs the Town’s sewer rate payers money to send this “clean” water to the MWRA system. In order to correct many of these issues, repairs and rehabilitations are being made as part of this project. We will update the website once scheduling has been set for this construction season. Any questions or issues can be directed to Marissa Liggiero at
  • Hayden Ave Pump Station Upgrades (Updated March 3, 2023) Hayden station includes a replacement of the existing below grade suction-lift style station with a new submersible type station. It also includes a new power service. The station includes new pumps/motors, controls, valve vault, new permanent standby power generator, piping and landscaping. This project has wetlands/groundwater and slope challenges. The contractor, DeFelice, plans to start construction on March 20, 2023. Please use caution when driving past the job site. Any questions or issues can be directed to Marissa Liggiero at

Projects by Other Entities Affecting Lexington

  • MWRA/Town of Burlington Water main projects will began April, 2022 along Lowell St from the North Ave to Summer Street.  These are two different contracts. This work is expected to take place over two construction seasons. Find out details of these projects

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