Photo: Mt. Evans Scenic Byway in Colorado, the highest paved road in North America. (CBS Denver)
In California, 70 percent of the water is in the northern half of the state and 70 percent of the people live in the southern half.
In Colorado, 80 percent of the water is west of the Continental Divide and 80 percent of the people live on the eastern side.
Both states built massive engineering projects decades ago to move the water where it was needed. Today, both states face opposition to plans to improve their water storage capacity and conveyance systems.