Someone traveling on I-82 noticed the man's body Wednesday around 2:12 p.m. near the highway between milepost 83 and 84, and deputies estimate the body was at that location for approximately four days.
Investigators found the body at the south side of a barbed wire fence, and believe the man was trying to climb the fence. No signs of injury were apparent.
The deceased has not been identified. He is described as a white man, possibly 55 to 70 year old, and balding with a long beard, according to Benton County Sheriff's Office reports.
Deputies said the man was wearing new looking shoes, jeans, a dark green colored light jacket and a black colored beanie type cap when his body was found. Detectives did not find any identification on the deceased.