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LAS VEGAS (AP) - Federal forecasters say the surface of Lake Mead could rise by about 15 feet or drop to a level not seen since 1937 within the next year.

Whether the reservoir gets more water will depend on Lake Powell. The U.S. Bureau of Reclamation says it soon might contain enough water to allow for surplus deliveries to Lake Mead next year.

Officials say there's a 50 percent chance of that happening. But if Lake Powell fails to reach the necessary level, Lake Mead will get no extra water and its decline will continue.