Fears have been raised about young people drinking alcohol and then jumping into Holme Lock near to the National Watersports Centre.
Hard-hitting signs have been plastered across the site of 12-year-old Owen Jenkins who drowned saving two girls in Beeston Weir.
The signs read: 'Don't let the next memorial be yours. Stay safe around open water' and display the site where Owen Jenkins lost his life in July 2017.
The Canal and River Trust are worried about the next few days when temperatures are expected to soar across Nottinghamshire.
It is known that young people are attracted to open water, but many are unaware of the hidden dangers waiting for them.
Owen's mum Nicola Jenkins, 44, who has endorsed the new signs, said: "I am absolutely petrified about this weekend.
"I always say '10 minutes of fun is not worth a lifetime of memories taken from your family. That's what we live with now.
"We live with the knowledge that Owen is not coming back."
She said the new signs will be placed at Holme Lock, Beeston Weir and Sawley Weir in Long Eaton.
She said 'the hard-hitting' message will hopefully make people think twice about the dangers, with plans to have more printed and distributed across the area.
The Canal and River Trust, which holds the guardianship of 2,000 miles of canals and rivers, said it is having "a lot of problems at Holme Lock, next to the National Watersports Centre, where "people have been drinking and jumping in."
They said lock keepers have been speaking to people regularly and extra signs has been put up but some have been pulled down.
The trust said it is now working with local partners including Nottinghamshire Police and Nottinghamshire Fire and Rescue Service who will be increasing their presence on site.
They also hope the new Owen Jenkins signs will "hit home with people thinking of jumping in."
With temperatures set to soar this week to up to 30C, the trust fears people will ignore safety in favour of a cooling dip.
They said people are also known to jump into the water from bridges, lock sides or even waterside buildings without knowing how deep the water is.
Phil Mulligan, regional director for the Canal and River Trust in the East Midlands, said: "Since lockdown we’ve seen a big increase in people reaping the health benefits of spending time by water, which is fantastic, but with temperatures set to rocket we’re urging everyone to please stay out of the water.
"We understand that people want to enjoy themselves but with less of us heading abroad this summer we’ve already seen examples of people getting carried away with a bit of sun and putting themselves in danger.
"We’re particularly concerned about reports of people drinking or taking drugs and then jumping into the water to impress their friends.
"It’s a recipe for disaster and people, particularly youngsters and their parents, need to understand that the dangers of what they’re doing are very real - tragically we see cases each year of people getting into difficulty and drowning on our waterways.
"Please do head to your local waterway this summer, they’re incredible places at this time of year, but be sensible, stay out of the water and make sure you go home safely at the end of the day."
