A section of Yonge Street is closed near the Eaton Centre after a watermain break overnight.
Police said all northbound lanes of Yonge are closed from Queen Street to Dundas Street due to the large pool of water.
Just before 8:30 a.m. crews were able to shut off the water.
There has been no word on what caused the break.
Shuter is also closed between Yonge and Victoria Street.
Police said there may be other closures as crews work to repair the break.