William Luke Ross was reported missing on June 18. His family said Ross had been living in a homeless camp along the river.
Investigators found an ID on the man's body, but will send it to a lab for confirmation. However, family members said the the ID belonged to Ross.
Search and rescue crews are on the scene with the fisherman who found the body. They said the body was found near Springhill Park in Barling, which is near Lock & Dam 13.
Crews were called to the area just before 9 a.m.
The story is developing, and more details will be added as information is released.