The only way you're going to stop the evaporation in that climate is by moving the lake underground. Another comment mentioned fixing the Colorado River - how

The only way you're going to stop the evaporation in that climate is by moving the lake underground. Another comment mentioned fixing the Colorado River - how about expanding that to include restoration of the entire natural river system throughout the Western US? In my mind, that's close to the economic scale of what would be required to keep this artificial sea in the desert from becoming a toxic brine pit. For context -- total domestic production of salt in 2015 was 48M tons; there's ~128M tons of salt in a cubic mile of seawater; and about 1.8 cubic miles of water in the Salton.