GREENFIELD, Mass. (WWLP) – The northbound side of I-91 in Greenfield is closed Friday for repairs along a bridge.

According to the City of Greenfield, MassDOT closed I-91 northbound from the rotary (Exit 43) beginning at 10:30 a.m. for repairs. Traffic on I-91 north is being rerouted into Greenfield and back on I-91 at exit 46 (Bernardston Road).

MassDOT stated I-91 would reopen by 3 p.m. however, it was extended and reopened at 4 p.m. Greenfield police say the detour has caused miles of back ups on I-91 from Stillwater Bridge in Deerfield all the way through the rotary. Drivers are being asked to be patient as heavy traffic is in the area of Main Street, Federal Street, High Street and Silver Street.

Crews are working to repair the deck on a bridge. The detour is necessary to allow crews to safely and effectively conduct emergency deck repairs.

MAP: I-91 in Greenfield

Massachusetts State Police and Greenfield Police are working to assist with traffic.