A water main break reduced a northbound section of Crowchild Trail to only one lane of traffic Monday morning. (CBC)

City crews will work late Monday night to try to fix a water main break that has caused traffic tie-ups on Crowchild Trail.

Flooding slowed northbound traffic on the busy route during the first morning commute of the week.

The water main broke on Sunday afternoon.

Only one lane remains open heading north between 33rd Avenue and 26th Avenue S.W. The bus stop in that area was also closed.

"It's more than likely not going to be repaired today. Again we won't know until we get down to the pipe what is the type of break, the extent of the break," said David Atkinson who speaks for the city's water services department.

"And that's the same on any water main break we have — we don't know until we get down and physically see the pipe, so we know what the extent of the repair is," he said.

Motorists are advised to use alternates routes — roads already impacted by C-Train route construction — including 14th Street, Sarcee Trail and 37 Street.

The water main break only affected three homes and the city is providing temporary water to those houses.