Lake Powell (IMAGE) University of Washington Caption This is Lake Powell and Glen Canyon Dam in July 2004, when the high-water mark was about 120 feet above the water's surface. This year, Lake Powell and Lake Mead are heading toward their lowest levels since 1968. Credit Bradley Udall, Univ. of Colorado Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.