NEW YORK - Crews are now working to repair a broken water main that flooded the streets near Lincoln Center Monday.

Service on the 1, 2 and 3 trains is back to normal after the MTA suspended service yesterday because of the flooding.

During the repair work, Broadway will be closed northbound between 60th and 65th Streets. Southbound traffic could be reduced to just one lane.

The three-foot water main burst early Monday morning.

It spewed more than half a million gallons of water into the basements of buildings, parking garages, and subway stations.

The pipe was more than 100 years old but the Department of Environmental Protection says that's not unusual.

“Age alone is not just an indicator of when we need to replace equipment. We’ve got some pipes that are from the late 1800s that are still in great shape and may continue service for another century, but we use a bunch of different tools---physical, chemical, analytical to determine when pipes need to be replaced. We do about   400 million dollars worth of water main repairs and replacements every year. About a mile of new water mains go in every week in the city, so we’re proactively doing that," said New York City Department of Environmental Protection Commissioner Vincent Sapienza.

The city is now using forensics to figure out what caused the main to break.

Fluctuating temperatures could be a factor because of the rapid drop from Sunday's warm weather to the colder temperatures Monday.