"It's gone nuts," he said. "It's unbelievable."
Mr Dawson had warned of the falls' safety after multiple rescues took place, but the official closure had been to no avail.
On one recent day he had stopped three carloads of people from entering, telling the occupants that they were entering private land.
"The word is out there," he said. "It's a beauty spot and it's no problem to find. But it's just dangerous. Very dangerous."
Late last year, traveller Ailis O'Neill discovered Omanawa Falls through a website about North Island waterfalls. He said that he had to hang on to tree roots while climbing down to the falls.
"For me it probably was one of the most dangerous things I've ever done. The way down is pretty much vertical."
For years the Tauranga City Council, which owns the underground power station and its access down from Omanawa Rd, has unsuccessfully tried to stop people reaching the falls.
Gates and fences erected by the council were no barrier to determined visitors.
Last October a 32-year-old French man was rescued when he fell 10m down the cliff, catching a tree which prevented him from falling 40m further to the rocks below.