Lake Powell, perhaps the most monitored body of water in the United States, recently reached a three-year water-level high. In July, the maximum elevation recorded was about 3,587 feet, which is a marked lift from when it dipped dangerously in April 2023, falling below 3,520 feet. Lake Powell needs to be at 3,490 feet above sea level for the Glen Canyon Dam to produce hydroelectric power for millions of people in the Southwest.