It's believed to be the body of a 25 year old man
Police were called to the yacht club area of Witham Bank West in Boston shortly after 1am on Sunday morning.
They'd received a report that a 25 year-old man had fallen from a boat and was missing in the water.
A police underwater search unit attended the scene and a man's body was recovered from the river at 8.45am.
The Coroner has been informed and a post mortem examination will take place in due course. In the meantime, his death will be treated as unexplained.