Elaine Marie Robertson, 24, left San Luis Obispo in spring 1979 for a Memorial Day weekend trip to Washington in her 1968 Volkswagen camper van with her dog. The last confirmed sighting was May 27, 1979, when a rainy evening found her at Sunshine Point campground on Mount Rainier. She appeared wet, cold and not entirely coherent; campers gave her a tent. The next morning Elaine and her dog were gone and all her belongings remained at the site.

Search teams of about 100 people, a helicopter and canine units combed the rugged terrain but found no sign of her or the dog. Her van, described as white or beige with California plate 752NRV, was later located — reports place it either within a mile of the campground or up to 40 miles away in Elk Plain on the Mountain Highway. Sunshine Point was washed away by flooding in November 2006, removing a key location in the timeline. Investigators have weighed exposure, accidental fall and foul play among possible explanations, but no confirmed resolution has been announced.

Does anyone have memories or information about the Mount Rainier area, Sunshine Point, or travel on Mountain Highway around late May 1979 that could help this cold case?