Detectives were called to the site in Buckhurst Hill, Essex by a member of the public.
Officers have confirmed that the incident is being treated as suspicious and the lake has been taped off.

Grisly find: A lake in Buckhurst Hill, Essex, has been taped off after a man's arm was discovered by a member of the public
The grisly find was made at 2.50pm yesterday afternoon and the Kent and Essex Serious Crime Directorate are investigating.
An Essex Police spokeswoman said: 'This is being treated as suspicious and I can confirm that the severed arm is from a man.
'Police would like to appeal for anyone with information to contact the Harlow Major investigation Team on 0300 333 4444.'
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