Where does Arizona get most of its water?
Where does Arizona get most of its water? Central Arizona's water supply comes from three main sources — the Colorado River, the Salt and Verde River systems, and groundwater.
What happens if the Colorado River dries up?
If the water levels dip much lower, the Colorado's northernmost reservoir won't have enough in the tank to both fill Lake Mead downstream and generate any hydropower, which would have devastating effects on the electricity grid in the western US.