Lake Powell is a major reservoir on the Colorado River. According to the U.S. Bureau of Reclamation Lake Powell is currently only at 42 percent of capacity as of May 20. The below images of Lake Powell were captured by a NASA satellite on May 12, 2014.
NASA Earth Observatory says "The low water levels are evident in these images, which were acquired by the Landsat 8 satellite on May 13, 2014. White bleached rock show where Lake Powell's shore is when the reservoir is at capacity. In the top image, which shows the northern section of Lake Powell, a muddy Colorado River flows through a largely empty lake bed.