Eh I doubt Colorado would block water rights to CA. AZ and UT are kind of the wild cats. I would expect them all to just let it keep flowing because someone up stream of them could do the same. It’s kind of like having nukes and having alliances.
But is the same sort of thoughts when I lived in the Great Lakes area. It was thought to be a good area for dirty bombs and to pollute the hell out of it because it feeds the rest of the country’s water.
Was always told The Perry nuclear power plant was a target because of that