Up to 1,500 homes in the northern Victoria town of Kerang could be affected if the Lodden River rises any further.

The State Emergency Services (SES) said the Kerang levee has been breached in many places and the townspeople should head for a relief centre on higher ground.

"You should ensure you have left your property immediately," the SES said in text message alerts sent about 5:20 a.m. to the town's 2,500 residents.

Walls of water kilometers wide are surging across northern and western Victoria in the wake of record rainfall last week.

Floodwaters have already left 1,000 households in Victoria's northwest without power, and thousands more homes are under threat of cuts as substations and low-lying power lines are submerged.

AP