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UPPER WEST SIDE, Manhattan — A broken 36-inch water main sent hundreds of thousands of gallons onto the streets of the Upper West Side and into the subway system Monday morning at about 5 a.m.

Neighbors have water because there are other mains in the area but some buildings and businesses were still cleaning up Monday night.

NYC Department of Environmental Protection crews will have to dig up W 62nd Street Between Columbus and Broadway.

After inspecting the pipe, they should be able to pinpoint a cause. The DEP Commissioner said temperature fluctuations can cause breaks.

The Center for an Urban Future, a non-partisan think tank in Manhattan, issued a report in August 2019 about the city’s infrastructure. It evaluated projects and spending for water and sewer mains and bridges.

NYC had 460 water main breaks in 2019 and has had at least 400 in 8 of the past 10 years.

Executive Director Jonathan Bowles says it’s still a matter of catching up.

The center says data shows NYC has made progress in replacing water mains the last 2 years and doubled funding for projects.

The findings show the city has accelerated its repair and replacement of aging water mains. In FY 2018 alone, 92.6 miles of water mains were upgraded, up from just 19.1 miles in FY 2010.

This break meant the 1,2,3 was shut down near Lincoln Center and rerouted for the morning commute. Transit crews had to open and inspect 72 signals and 12 switches that were under water. Service was restored around 4 p.m.