MassDOT on Sunday, July 27 at 9:00PM will begin work to improve the median and Commonwealth Avenue Bridge substructure on Interstate 90 in Boston.

Beginning Sunday night at 9:00pm and lasting for approximately six months, the left lanes in both Eastbound and Westbound directions on I-90 from west of the Prudential tunnel to the Commonwealth Avenue Bridge will be closed to traffic in order to create work zones for substructure rehabilitation work. Closure of the right lanes in both directions will follow upon the reopening of the left lanes. Three lanes of traffic will be maintained in each direction on I-90 Eastbound and Westbound during peak hours.

Short-term nighttime and weekend closures of an additional lane on I-90 Eastbound and Westbound may take place as required.

Work to be performed throughout this project will include rehabilitation of the east and west abutments, as well as major rehabilitation of the east and west piers. The project will also include reconstruction of the I-90 median.

The project will be ongoing throughout the next twelve months leading to the replacement of the Commonwealth Avenue Bridge deck over I-90 which is scheduled to begin in late 2015.

The Commonwealth Avenue Bridge was constructed in 1962 and supports Commonwealth Avenue traffic and the MBTA Green Line.

MassDOT encourages drivers to plan ahead as those traveling through the area should expect delays.