MARITIME Safety Queensland has confirmed Gladstone Harbour will be closed to all shipping, commercial and recreation vessels today.
Gladstone regional harbour master Mike Lutze said poor weather conditions caused by a low tropical front stretching across the coast was responsible for the closure.
"It's too dangerous to operate in these conditions," Mr Lutze said.
"We will look at the task involved and continue to monitor the Bureau of Meteorology website to see if we can resume operations.
"At this stage it looks unlikely that we will be opening the ports today."
Mr Lutze said no incidents had been reported on the harbour this morning.
He urged boaters to take caution if travelling in surrounding waters.
Curtis Island employees have been sent home.
Bechtel general manager Kevin Berg said the company had been monitoring the weather for days in advance of the rain, so preparations had been made to ensure workers were safe.
"Both yesterday and today employees were sent home for the day," Mr Berg said.
"We are continuing to monitor the situation closely and expect to be back to normal following the long weekend on Tuesday."