Please note the photo that accompanies this article . That shocking white watermark on the Canyon walls tells the true tale of these manmade lakes . They are drying up no getting around that fact there is simply not enough H2O for this pipeline there is barely enough for today's demands . Until California invest in massive desalination plants along the Pacific coast these watermarks will get bigger until , there is No water left in Mead or Powell . A real inconvenient truth concerning the water crisis in America's southwest . Asking to draw more water is not going to help this crisis , at all in any way .