Gladstone Mayor Gail Sellers says having wet weather again so soon after flooding in central Queensland last month is frightening.
A severe weather warning is in place for central Queensland, with some areas receiving more than 200 millimetres.
Water levels at the Awoonga Dam are rising to the minor flood level and spilling over the dam into the Boyne River.
Councillor Sellers says some creeks in the Boyne Valley, south-west of the city, have broken their banks.
She says it is still very raw for many who are still recovering.
"I'd be very concerned for people who were unable to get out of their properties during that last [flood], and also the ones that were totally inundated by the rain," she said.
"We still have a lot of those people who are not yet back in their homes.
"This is just going to add to their concerns and add to their problems."
Goovigen grazier Will Baker, west of Gladstone, says he has had more than 200 millimetres of rain in the past three days and his cattle are running out of high ground to stand on.
"The storms are very violent with a lot of bolts of lightning," he said.
"The lightning is the frightening thing - it's bang, bang, bang, bang, bang.
"It's real close and I'm a bit concerned about lightning strikes on my cattle because they've been bunching in the rain.
"With so much water on the ground you could soon see a fair mob get struck by lightning."
In the town of Buliyan, south of Gladstone, local resident Laura Holmes says some areas are isolated.
"They're pretty wild, they're gushing, there's no way we'll be able to get through for a while."
© ABC 2013