I'm sympathetic to this proposal, but just a head's up that UTAH would violate the Constitution if it tried to do this. One of the most important cases in US history -- McCulloch v. Maryland concerned an effort by Maryland do to something very similar in order to kick out a federal agency they didn't want. Chief Justice John Marshall and the Supreme Court said that no, that states can't do that, way back in 1819. It's a nice try but the issue has been tried and settled.
They don’t want to kick out a federal agency. They just want to cut off its water supply. McCulloch v. Maryland doesn’t apply.
Utah just needs the water for something else. Irrigation maybe. They have a good case and can win in court.
Nothing will stop the federal government from doing whatever they want anyway.