The 18-year-old, named in local media as Lee de Paauw, suffered extensive injuries to his left arm after he was attacked in Johnstone River on Australia's northeastern coast today, the Queensland Ambulance Service (QAS) said.
He had jumped into the river as a dare while "revelling with friends," QAS Cairns senior operations supervisor Neil Noble told reporters.
"He's very fortunate that he survived this incident and was able to be rescued... (he's) due to undergo surgery for extensive injuries to his arm," Noble said.
De Paauw's friends' efforts to get him out of the water quickly helped him survive, Noble added.
Crocodiles are common in Australia's north where numbers have increased since the introduction of protection laws in 1971.
Crocodiles kill an average of two people each year in Australia.
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