Eugene McCommon was 35 when he disappeared on December 5, 1991, while preparing his boat to pass through the locks near Chickamauga Dam on the Tennessee River in Chattanooga. Eyewitnesses reported seeing him fall overboard on the lower side of the dam, go under the surface, and never resurface. Immediate search efforts were conducted in the river, but his body was never recovered.

At the time he was described as 5 feet 9 inches tall, about 135 pounds, with brown hair and brown eyes. He was last seen wearing a white pullover t-shirt, blue jeans, and tennis shoes, and had a tattoo of an unknown design on his left arm; he was known to sometimes grow a beard. Authorities have long considered drowning the likely cause, and the Chattanooga Police Department classifies the case as Lost/Injured Missing and maintains the file.

The case rests on eyewitness accounts of the fall and the lack of any evidence suggesting another explanation. If anyone witnessed that day near Chickamauga Dam or has information about Eugene McCommon, please come forward.