The images below show how dramatic the drop can look at the lake in just one year. According to NASA Earth Observatory these images were snapped on July 21, 2014, and June 16, 2013, by the Operational Land Imager on the Landsat 8 satellite. Both images show the lake at its south end, near Hoover Dam. Differences in water color could be a difference in the amount of suspended sediment or a result of slightly different lighting. Shorelines retreated over the year, and islands in the middle of the lake continue to grow as water recedes."