A motorcyclist has died after he was thrown from his bike into the Brisbane River on Saturday night.

The rider, 31, was on Ann Street in the city when he lost control around the bend leading to the on ramp towards Coronation Drive about 10.20pm.

The motorcyclist was thrown from his bike into the Brisbane River.

The motorcycle crashed into the side barrier, throwing the Gold Coast man over the edge and into the Brisbane River.

Water police searched the area and found the rider near the Queen Street Ferry Terminal.