A concerned resident contacted Cr Cassidy on Wednesday when they noticed people launching themselves from the red caps on the top of the iconic Wollaston Bridge into the Merri River in the city's north.

"It is so dangerous. They could end up killing themselves if they keep doing it," she said.

"To jump off that very, very high top, it's absolutely crazy.

"We're just warning kids not to do it.

"You could wind up a paraplegic or anything."

Cr Cassidy said young people had been scaling the guide ropes to the top of the red caps and jumping from there.

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There are signs at the bridge which warn of the dangers of diving and jumping off.

But Cr Cassidy said young people were ignoring them.

Cr Cassidy said it was not the first time young people had been spotted jumping off Wollaston Bridge but it was the first time the concerned resident had seen them that high on the red caps.

"They normally just jump off the bridge, which is bad enough, but to go that much higher is crazy," she said.

Cr Cassidy said she wanted to get the message out, especially in the lead-up to summer, that if members of the community were driving past and noticed the behaviour to call police, or pull over and ask those jumping off to stop.

"It's trying to get community awareness out there that it is dangerous and they are going to hurt themselves, we definitely don't want that," she said.

"Someone will get really badly hurt if they do continue."

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