It's always amazed me how they decided to build such huge cities in the dessert so far away from any significant fresh water. Seems like someone could make a fortune laying a water pipe along the coast to get water from the sacremento river, or columbia river or several smaller rivers or something. They could lay an undersea water pipe down the coast to LA just like they do oil pipes and if it leaks big freaking deal, patch it up and no mess to clean up! Take the pressure off LA using that water and Vegas and Phoenix would be free to use the colorado without worrying about running it dry (for a while) and let those fake lakes fill back up.