Crews worked through the night to replace the ruptured pipe and repair the undermined roadway in East Rutherford.
The main broke early Monday morning near MetLife Stadium, forcing authorities to close Route 3's eastbound lanes.
All traffic was being diverted to the Route 3 service road, the New Jersey Turnpike and Route 120.
The roadway, a major access to the Lincoln Tunnel, was shut down throughout much of the day.
Get Eyewitness News Delivered