Could floating solar panels on a reservoir help the Colorado River?

Water + salt = corrosion

you forgot to add in ,zero land costs, and a certainty that the solar coridor will intersect transmission lines.also it is a fact that agriculture is now useing water at non sustainable rates, so every drop saved is significant, and I would not be surprised if they are evaluating, "curtaining" the remaining air gaps and attempting to elliminate evaporative loses. As far as "complexity" goes, I take that you mean in comparison to perfectly flat level ground, that is cheap, and located next to transmission lines, and markets, in an area with easy permiting requirements.Here's the rub though, any large scale mega project is a beast to spool up, but once it get's moving it becomes routine and if the quality of engineering and management is up to it, then efficencys of scale will tend to zero out minor quirks.