Why it matters: It’s the fourth such discovery in the nation’s largest reservoir by volume since May, as a mega-drought plunges Lake Mead’s water level to its lowest level since 1937, per AP. Details: “National Park Service rangers received an emergency call reporting the discovery of human skeletal remains at Swim Beach in Lake Mead National Recreation Area, Nevada, on Saturday morning, according to a statement from the NPS.

Rangers worked to recover the remains with the Las Vegas Metropolitan Police Department’s dive team, the NPS said. The Clark County Coroner is investigating the cause of death.

News lead: The Southwest is in the grip of a major drought lasting more than two decades, and studies show it’s more severe than any in the last 1,200 years, which is driven in large part by climate change, notes Andrew Freedman of Axios. The Big Picture: Lake Mead straddles Nevada and Arizona and is part of the vast Colorado River basin that supplies water for agriculture and human consumption to seven states, while also generating electricity at the massive Hoover Dam. Go deeper: Discovery of new Colorado River drought shows how bad things can get