MTA crews expected to restore A, B, C and D subway service by Tuesday morning, after Monday's water main break on the Upper West Side led to major service disruptions, but officials said it may take days to repair the damaged pipe and repave affected roads.

The city Department of Environmental Protection said heavy streams of water in the vicinity of Central Park West and West 106th Street were first reported around 11 a.m. Monday, but crews were able to shut the flow down about an hour later.

Emergency officials say one building was flooded but no evacuations were ordered, and Consolidated Edison officials said no gas or electrical outages have been reported.

"I came out at 11 o'clock, because I had a meeting down in Brooklyn, and there was a river in front of our apartment, literally," said a nearby resident.

"All the water just rushed in and all the floor in my brother's room is just completely flooded -- his bed, everything," said another.

Officials were still conducting excavations on Monday to find the exact location and cause of the break.

The broken water main dates back to 1917, but officials said the damage was likely due to temperature nearby construction activity, rather than the pipe's age.

"From time to time, some of the cast iron mains do fail catastrophically. They just sort of explode," said James Roberts of the Water and Sewer Operations Bureau. "We'll take it and put it under a microscope, but that testing will take several weeks to a couple of months to get back, and then we'll know definitively, but it's too early to speculate."

In the meantime, DEP officials said there was no need to boil tap water.

Between 103rd to 125th Streets, several subway stations flooded as well, and the water shorted out equipment and brought firefighters.

MTA officials said four pumps were removing 6,000 gallons a minute from the flooded tunnels throughout Monday.

By Monday night, downtown A trains were not going south of 145th Street and uptown A trains were not going north of the 59th Street-Columbus Circle station.

There was no C train service in both directions between Euclid Avenue and 168th Street, and no B trains were running between 145th Street and Brighton Beach.

Downtown D trains stopped at the 161st Street-Yankee Stadium Station in the Bronx and uptown D trains did not go north of the 34th Street-Herald Square Station.

The MTA said a smoke condition at the 125th Street station at St. Nicholas Avenue was also a result of the break.

However, Monday's transit riders mostly took the disruptions in stride, and the MTA expected to have subway service fully restored by Tuesday morning.

For the latest transit service updates, visit mta.info.