He said they realised it was a vehicle in the water and raised the alarm.
"The guy had attempted to drive across it and got swept down the river. He ended up in a big pool.
"Luckily the car got wedged on a rock in the middle of the river."
With the water still rising, the stricken driver took to the only part of the vehicle that was not underwater, Flewellyn said.
"The guy managed to climb out of the window and was sitting on the roof of his ute."
Firefighters threw a rope and a lifejacket to the man, who was wet and cold.
"And then we threw another rope across to him and then got him to jump in the water and pulled him to safety."
Flewellyn said when the man got out of the water he was thankful but extremely cold.
"We gave him some warm clothes to put on. He was pretty wet and cold but otherwise fine."
He said given the conditions the man was fortunate so much went in his favour this morning.
"He was really lucky the car stayed upright and didn't flip and lucky he could get out onto the roof. He was also lucky the vehicle ended up stopped on a rock."