Visited Hoover Dam. It is a beautiful and impressive piece of engineering. Hoover Dam and others on the Colorado are a big contributor to the prosperity of California and the Southwest. We forget how much is really man-made. Large water works are what makes possible the large populations, industry and productive agriculture. There is no such thing as a natural resource, only natural potential.
Lake Mead is low because of the drought. The high water mark was in 1983. But there is not enough water to go around, even when the lake is full. Water has been over-allocated. More than 100% of the water has been promised to farms and cities. Worse, the allocation are based on “normal” years. Normal years are rare.