A body, believed to be that of a 50-year-old man fear drowned, has been located by police and emergency service members in Tennant Creek this morning.

Witnesses told police that the man was swimming in floodwaters at the Seven Mile Bridge north of Tennant Creek when he was swept away by floodwaters around 3:45pm yesterday.

Police and Emergency Service personnel conducted a land search of the area on foot and utilising motorbikes where accessible, up until last light.

The body of a man was located some distance down the river.

Police investigations are ongoing.