Incident #76 Sighting Report — Salmon Dam, Idaho, 13 August 1947

This document details Incident #76, which occurred on August 13, 1947, near Salmon Dam, Idaho. Two civilian witnesses reported hearing a sound described as the echo of a motor and subsequently observed two circular objects at a great distance. The witnesses estimated the altitude of these objects to be between 4,000 and 6,000 feet and noted they were traveling at a great speed. The report includes a check-list and summary notes from the Air Materiel Command, which evaluated the sighting as part of Project Grudge. The official opinion provided by the Air Materiel Command is that there is no evidence to refute the assumption that the witnesses observed two ordinary aircraft, but that the distance was too great to discern any specific details. The document also notes that while this sighting occurred on the same day as Incident #75, the descriptions of the two events are significantly different and show little to no similarity. The report includes an incident index referencing various other sightings evaluated by Dr. Hynek, categorizing them by their likelihood of being astronomical or non-astronomical in nature.