More than 8,500 years ago, a group of people used a rock shelter at the confluence of the Palouse and Snake Rivers as a base camp. When rediscovered in the early 1950s, the shelter amazed scientists, including Washington State University archeologist Richard Daugherty, with its wealth of artifacts—and the age of its human remains. Named after the property owner at the time, the Marmes Rockshelter was soon inundated by waters from the recently closed Lower Monumental Dam on the Snake. Although a levee had been built by the Army Corps of Engineers to keep the shelter dry, the Corps neglected to take into account the layer of permeable gravel beneath the site. Within three days, it was all under water. » More …