A Search and Rescue team used lines to get down the bank, but it took crews almost seven hours to reach him because of poor weather.
A police spokeswoman said LandSAR began to clear an area for the stretcher around 10.20pm, but the patient wasn't transported to hospital until around midnight.
She said an access route down to the river had to be made by cutting back bush with chainsaws and slashers. They had to use ropes to get the stretcher the man was on up about 100m from the river to the road.