Traffic alert: Portions of Lexington Street southbound will close for 8-10 weeks

Beginning Monday, March 10, southbound traffic on Lexington Street from the Lexington-Waltham line will be detoured for eight to 10 weeks.

Detour routes for commercial and noncommercial vehicles can be found here. The City of Waltham urges drivers to plan ahead, as the closure will be in force around the clock, seven days a week. 

The closure is due to a long-term water main project by the Massachusetts Water Resources Authority (MWRA). It involves constructing new water main pipelines and connections along Lexington Street. 

The MWRA and its contractor are expected to move the worksite north of Trapelo Road on March 10. This will require traffic changes along the roadway to ensure an efficient and safe work zone for crews to advance the project and to enable a consistent flow of traffic through or around the work site. 

Starting in Lexington, only local southbound travel will be allowed between Concord Avenue to the Waltham municipal line. There will be no southbound access past Watertown Savings Bank (1075 Waltham St., Lexington). 

Lexington Street will remain open to northbound traffic at all times.

This new water main will provide sufficient capacity to maintain water service to Waltham during the anticipated shutdown of MWRA’s WASM 3 pipeline and the Lexington Street Pumping Station for future rehabilitation. Additional information on the project can be found here. 

Questions and concerns should be directed to the following MWRA contacts: Matt Messier (617-733-2961; Matthewm@engineeredconceptsinc.com) or Troy Wall (617-305-5762; Troy.Wall@mwra.com). People can also sign up to receive online updates from the MWRA.