UPDATE 11:53 a.m.: Pennsylvania Ave will be closed at 22nd St. until 7 p.m. to repair the water main break, DC Water reports via Twitter.
UPDATE 10 a.m.: Pamela Mooring, a spokeswoman for District of Columbia Water and Sewer Authority, says the broken main was installed in 1858, AP reports.
UPDATE 7 a.m.: DC Water crews are repairing a broken 12 inch main at 22nd Street and Pennsylvania Avenue, NW. Crews have isolated the source of the break and water is no longer flowing to the roadway, ABC 7's Lisa Baden reports. Some customers in the area may experience a disruption in water service until repairs are completed. Repairs are estimated to be finished by 2 p.m.
Pennsylvania Avenue between 21st and 22nd streets, NW is closed to northbound traffic as repairs continue. Drivers should use alternate routes.
UPDATE 6:32 a.m.: DC Water and Sewer Authority, D.C. police and Pepco crews are on the scene.
UPDATE 6:06 a.m.: ABC 7's Lisa Baden reports Pennsylvania Avenue is closed between Washington Circle and 21st Street. She says 22nd Street is also closed between I Street and Pennsylvania Avenue, and a portion of 23rd street has been shut down.
UPDATE 5:50 a.m.: DC Water crews are enroute to 22nd and Pennsylvania Ave NW, to investigate a suspected water main break. At this time, the diagnosis and estimated completion time are unknown.
A massive water main break in Northwest is flooding Washington Circle near Pennsylvania Avenue early Tuesday morning, and creating traffic problems during Tuesday morning's commute.
The break, located across from George Washington Hospital Center, occurred around 5 a.m. Sources say the roadway looks like a river and may disrupt traffic.
There no word if WASA crews are enroute to the broken pipe at this time.
Check back for more updates.