How crazy would it be to (Mostly to help the American Southwest, though if it worked, it could be used anywhere that uses river basins as a major source of fres

How crazy would it be to (Mostly to help the American Southwest, though if it worked, it could be used anywhere that uses river basins as a major source of freshwater for extremely large areas) create a large pipeline to feed an inland desal plant that's located along the shortest, lowest, least populated path to the headwaters of multiple major freshwater sources, like the Colorado and Rio Grande and the pump desal water into the existing water distribution network? While it's a major geoengineering project (musk-scale!), it would allow for usage of current legal and physical water distribution to be reused. Also, while CA desal cites briny outflow disposal as a major impediment to desal, why not pump the outflow to existing salt flats? (Edited for clarity)