A water main broke near 5th and Jefferson early Friday evening.
Crews were still on the scene late Friday night working to repair the issue.
Water was flowing all the way down the hill to Gardner Expressway, creating slushy, slick and icy conditions for drivers.
The City of Quincy says the repair will require an interruption in water service for about 4 hours.
Once water is restored, a 48-hour boil order will be in effect for residents on South 5th Street from Jefferson to Payson Avenue.