The water level in Lake Powell has dropped to the lowest level since the U.S. government started filling the enormous reservoir on the Colorado River in the 1960s — another sign of the ravages of the Western drought. … The water level has plunged as the American West experiences what scientists are calling a “megadrought.” Too little water is coming into the lake, and too much is being sent downriver to maintain levels in Lake Mead, which is also at historically low levels. 

Related articles: 

• LA Times Today: Lake Mead drops to a record low amid drought
• Fox 5 Las Vegas: Did this week’s rain help Lake Mead’s levels? Short answer: no 
• Arizona Republic: Lake Powell water levels hit a record low and continue to decline
• The National News: A river runs dry: farms and ranches along Colorado River in jeopardy