The Multnomah County Sheriff's Office is investigating a body discovered Sunday morning along the side of the Historic Columbia River Highway.

The name of the deceased, described as an adult male, was not immediately released. There are no obvious signs of foul play. The body has been turned over to the Multnomah County Medical Examiner's Office.

According to the sheriff's office, at approximately 8:00 a.m. on Aug. 10, deputies responded to a report of a body seen along the side of the Historic Columbia River Highway by a passerby just east of the Oneonta Gorge tunnel. When deputies arrived, they located the body of a deceased adult male about 50 yards east of the tunnel, which is near milepost 34.3.

MCSO detectives and the medical examiner were notified. The highway was closed in both directions for approximately two hours just east of the tunnel while the investigation was conducted.