Police were called at 3pm on Friday, May 28 to Ulley Reservoir in Rotherham after receiving calls that a teenage boy had got in to difficulty in the water.
Specialist search teams were sent to find him and people were urged to avoid the area.
At about 7pm, South Yorkshire Police confirmed that the underwater search team had found a body
No formal identification has yet taken place.
The boy’s parents have been informed and are being supported by specialist officers.