An apparent valve failure caused the high-pressure steam leak, at First Avenue and East 36th Street.
The steam leak closed First Avenue through the low 30's, but it reopened around 8 a.m.
"We just had the UN. There's always something and so now I want to be able to walk around like a normal person," said Louie Mingione, a resident.
There were no air quality issues and no one was injured.
Con Edison said they isolated the section of the pipe that failed and stopped the steam.