The man's body was found just before 2:30 p.m. Sunday in the river between Hutchinson and South Hutchinson.
County investigators say the body appeared to have been in the water for some time.
It is possible the body is 40-year old Shawn Burditt who disappeared November 13th. The search for Burditt near the Arkansas River in South Hutchinson proved unsuccessful last November.
The autopsy Monday should give authorities a positive identification.