On Lake Powell Utah
The lake, which lies partly in Arizona and mostly in Utah, is more than 500 feet deep in places. While Utah has the lion's share of Powell's crystal clear water, Arizona lays claim to the most important part—the dam. It took 17 years, from march 13, 1963 to June 22, 1980, to fill to the planned level of 3,700 feet above sea level. Lake levels fluctuate depending on the spring runoff from the mountains and the releases needed to produce electricity from the dam's eight generators.