The results showed that only ten percent of all swimmers observed at Lake Mead NRA wore a traditional lifejacket. Visitors who don't wear lifejackets can unexpectedly find themselves in life threatening situations while swimming in the lakes. In 2012 and 2013, 100 percent of drowning victims were not wearing a lifejacket. Earlier this year, two women using pool toys at Boulder Beach were swept away by the wind and unable to swim back to shore.