Updated 4:50 p.m. — The city of Annapolis announced the water main break on Calvert Street has been repaired. Water service was restored at about 3:30 p.m. and the portion of Calvert Street near the Arundel Center has been reopened to traffic. 

A major water main break downtown has closed off traffic on a portion of Calvert Street and caused several buildings, including the Anne Arundel County government headquarters, the Goldstein Treasury Building and surrounding locations to shut off water, a city spokesman said today in a press release.

A portion of Calvert Street, between Northwest and West streets has been closed.

Workers were on site around 11 a.m. to repair the break that, according to the release, could take as long as eight hours.

According to the press release, the 12-inch water main break was discovered on Calvert Street around 7:30 a.m. Officials say it is unclear when the break occurred and estimate that it could be expelling as much as 3,000 gallons of water per minute.

According to the release, the Department of Public Works has determined the cause of the break to be from "freezing temperatures and aging infrastructure."

The city will continue to update its website as more information is available.

Updated 1:20 p.m.- According to Dave Abrams, public information officer for Anne Arundel County, the Arundel Center closed at noon.