Drivers were warned to expect delays in the area due to the closure.
The northbound lanes from Imperial Highway to Atlantic Boulevard were expected to remain closed until 5 a.m. Tuesday.
Traffic in both directions will be using southbound lanes with a speed limit of 45 mph.
The $65 million project to improve the busy Long Beach Freeway had left the northbound lanes closed for eight weekends straight, but they had typically been reopened in time for the Monday morning commute
Officials said pavement put down over the past weekend is about a foot thick, and it did not solidify in time.
"The contractor discovered after excavating at about five feet that some of the material under the pavement was just not suitable to pave over, so they had to spend a lot of time excavating before they could lay the payment," said Judy Gish of Caltrans.
Drivers were advised to take alternate routes, such as the 110 Freeway, 605 Freeway or Atlantic Boulevard.
The closure has inevitably turned to a source of frustration for drivers.
"We're trying to get to work around here and get home around here," said Lynwood resident. "When you come home it takes us 30, 40 extra minutes to get home from the freeway because it gets crowded all around here."
