Route 1 in Groton was closed in Groton after a water main break on Wednesday morning.
Poquonnock Road, or Route 1, will be closed to all traffic between South Road and Buddington Road in Groton on Saturday so Groton Utilities can repair the damaged water main from earlier this week.
The road will close at 6:30 a.m. and is expected to be closed all day.
The following detours will be in effect.
Westbound: Traffic will be diverted onto South Road, to Runway Lane, to Tower Avenue, to High Rock Road to Poquonnock Road.
Eastbound: Traffic will be diverted onto Buddington Road, to Gold Star Highway, to North Road.