Dennis Eugene Johnson, an 8-year-old from Inyokern, California, vanished on July 12, 1966, during a family camping trip in Yellowstone National Park. The family stopped for a picnic at Cascade Picnic Area, about a quarter of a mile north of Canyon Junction. When Dennis’s 7-year-old sister wandered off, Dennis and his father separated to look for her; the father found the sister but Dennis never returned.

An extensive, two-week search using helicopters, bloodhounds and volunteers covered a large area of the park but turned up no trace of Dennis, not even footprints. He had some wilderness experience from previous hunting trips with his father, yet the park’s vast terrain and hazards complicated the search. Authorities have classified the case as lost/injured and considered possibilities that he became lost, was injured, or was picked up by a passing motorist. No additional clues have surfaced.

If anyone has memories of that day at Cascade Picnic Area or information about Dennis’s disappearance, please share what is known.