As work continues to repair the McGrath Highway/McCarthy Overpass, MassDOT announced this week that upcoming work will require the complete closure of the overpass between Prospect Hill Avenue and Poplar Street, and the Medford Street Tunnel between the hours of 9 p.m. and 5 a.m. weeknights beginning Monday, April 7. Weather permitting, work is expected to continue overnight for a period of two months.

During these work hours, vehicles will be detoured as follows:

Medford Street Tunnel:

— Northbound traffic from Medford Street will be detoured left onto Somerville Avenue and right onto Washington Street (at Ricky’s Flower Market).

— Southbound traffic from Somerville Avenue will be detoured left onto Washington Street (at Ricky’s Flower Market), or may continue on to access Medford Street or McGrath Highway at Poplar Street.

McCarthy Overpass:

— Southbound traffic on McGrath Highway will be detoured onto the surface road at Prospect Hill Avenue, across Somerville Avenue and back onto McGrath Highway at Poplar Street.

For the three week look-ahead, visit www.somervillema.gov/alerts/city-construction-updates. If you have questions, please contact 311 (617-666-3311).