A comparison of water levels in Lake Mead in 2000 and 2015
NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey
<a rel="nofollow" class="external free" href="https://earthobservatory.nasa.gov/images/86426/losses-in-lake-mead">https://earthobservatory.nasa.gov/images/86426/losses-in-lake-mead</a>