From KOLD.com (Erin Jordan):
Above Lake Powell, upstream of Lake Mead, the average snowpack for the Colorado River watershed is 112% of average. As the snow melts, it’s expected to raise water levels in Lake Powell, which will then allow an increased release of water downstream into Lake Mead. The Bureau of Reclamation forecasts a 97 percent probability that more than 2.5 million acre-feet (more than 850 billion gallons) of additional river water will be released from Lake Powell into Lake Mead this year. The above average release from Lake Powell will raise water levels in Lake Mead about 25 feet.