Crews responded to the scene of the broken 16-inch water main at around 6 a.m.
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An image from VeoliaWater NJ showed water extending across Observer Highway.
The break caused reduced water pressure throughout Hoboken, but no boil water advisory was deemed necessary.
Mayor Ravinder Bhalla said water pressure would be restored to the city as soon as the broken main on Observer is isolated.
"I know the situation is making it difficult for many on this Thanksgiving but I thank residents for their patience," Bhalla said in a statement on Twitter shortly after the break was reported.
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The mayor tweeted an update around 9:30 a.m. saying the main had been isolated and water pressure was returning to normal around the city.
But Hoboken Public Safety Director Ken Ferrante said water pressure remained low in the area of the water main break.
Three blocks of Observer Highway, the main road into the city from the south, were flooded, and flooding was reported in buildings on the Garden Street side of the highway.
Veolia Water said around 4 p.m. that the main was isolated and service was restored.
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One building was still being impacted as repairs continued.
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