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Ancient Native Americans
Some of the oldest ghosts are said to be those of Native Americans who once lived on the Colorado River in this area. Allegedly, they still roam the land to keep it protected and are sometimes angry because their culture was destroyed and their land was taken over. Campers have reported hearing wailing voices carried by desert winds.
In March 2017, Lake Mead was named the deadliest park in America by Outside magazine. Pulling records from January 2006 to September 2016, the magazine determined that Lake Mead had more deaths than any other National Park. At that time, Lake Mead had than 1,000 deaths, excluding suicides. The number one cause of death was drowning, with motor vehicle crashes and falls following. The park also had the most homicides of any national park. Some of these souls probably continue to haunt the park.
https://www.legendsofamerica.com/lake-mead-ghosts/