Queenstown's Harbourmaster has criticised youngsters seen jumping off the new Kawarau Falls Bridge.
Marty Black called the activity ''ridiculous'' after being contacted by a local father, who was concerned about his son and a group of youths jumping into the river.
''In the strongest terms it's ridiculous how dangerous it is.
''They need to grow up and get some brains,'' Mr Black said.
As well as the obvious dangers of jumping from that height (about 10m), the number of boat users on the river meant the potential for serious injury or death ''doesn't bear thinking about'', he said.