SAN FRANCISCO — Residents returning to homes damaged by flooding should be prepared to flee again as yet another powerful Pacific storm takes aim at Northern California, officials warned Sunday.

The San Joaquin River was reaching flood stage, and residents of Manteca were told to be ready to leave in case it hit dangerous levels. Meanwhile, the water level was decreasing at Lake Oroville dam, where a damaged spillway had raised major flood concerns.

Water was also receding in the farm community of Maxwell, where dozens of people sought higher ground after creeks topped their banks and inundated houses on Friday, said Colusa County Assistant Sheriff Jim Saso.

Nobody was hurt as crews used boats to rescue residents from a low-lying neighborhood.

‘‘We’re telling those people to keep a bag close by and get ready to leave again,’’ Saso said. ‘‘If the water comes back up, it’s going to be those areas affected.’’

Another round of heavy rain was expected to move in later Sunday and forecasters said several inches were expected along the central California coast, the National Weather Service said.

Associated Press