Lake Mead, the largest reservoir in the United States, has plummeted to its lowest water level since it was filled some 90 years ago, another sign of the crisis plaguing the Colorado River system. Water levels at Lake Mead hit 1,040.4 feet (317.1 meters) above sea level on Friday, according to federal data. It comes a week after federal officials announced a short-term proposal to stave off a crisis in the beleaguered waterway. Together, the two bodies of Colorado River water are the lowest they’ve been in nearly seven decades. The post Largest U.S. reservoir plummets to lowest level since it was filled some 90 years ago as water crisis deepens for western states appeared first on Fortune.