"I'd seen this big, white belly and I thought it was a dead Murray Cod and I gave it a poke with the paddle," he said.
"It went under the log and then the current took it.
"I'd seen the legs, so I went for a closer look and then I saw the tail and lifted it out of the water."
Mr Lodge said it looked like it had been there for a while, but has no idea how it got there.
"It looks like it's had it's skin taken off it, and it had a hook in it's mouth but there's no line attached to the hook."
Mr Lodge posted photos and videos to his Instagram account to prove his mates wrong.
"I went past a few friends of mine in a boat. No one believed me."
He said the discovery raised concerns over the activities of people in the region, but he believed the River is still safe.
"I don't think people should be concerned that there's crocs in the Murray though," he said.
"I think it's been dumped there, but I can't really say."
Mr Lodge made contact with state Fisheries.
"I've tried to find NSW Fisheries on Instagram. I've sent an image to the Victorian Fisheries."
Director of Fisheries Management at the Victorian Fisheries Authority Dallas DeSilva said the crocodile is most likely not from Victoria.
"This sort of this hasn't happened before as far as I can remember," he said.
"Crocodiles don't live in the Murray and it's likely to have been brought down from further North.
"NSW Parks and Wildlife Service are currently investigating the matter and they'll be able to provide a more detailed report in the near future."