WATCH: 40m piece of concrete pier causes havoc in Brisbane River

Bit of concrete piers, including one measuring some 40m, have been set adrift in the Brisbane River by rising floodwaters, with one striking a boat.

Queensland Police say a 40m piece of concrete pier that broke away and was floating down the Brisbane River has now been secured.

The large piece of concrete, which was first spotted in waters off Hamilton, is believed to have broken off from a rowing club pier near Sandgate and Breakfast Creek roads.

Some boats have already been dragged downstream by the current after being hit by loose pontoons.

It’s understood two concrete pontoons were floating downstream when one hit a boat and cut its anchor.

Boats being rescued after being set adrift by loose pontoons in the Brisbane River.

The pontoon was secured by rescue teams on the side of the river while the other is believed to have continued floating downstream.

Two boats were dragged down the strong current as good Samaritans in tow boats and tinnies worked hard to pull them to shore.

People on board the boat appeared panicked as ropes were attached and tinnies were used as tug boats.

The boats were brought to safety at Rivergate Marina with one missing both it’s engine and anchor.

Brisbane Lord Mayor Adrian Adrian Schrinner earlier announced all CityCat and ferry services would be suspended due to the dangerous conditions.

“Please avoid ferry terminals and do not walk or drive through flood water,” Cr Schrinner said.