Do you know how much water is in that river? It isn't all that large. Do you know how much of the water is already spoken for by various canals and city water treatment plants? Do you know whether any of the water in that river is actually available?
Same thing with the lake. The lake is the only supply of water to the river. You can't just pump a bunch of water out of the lake without cutting out the people downstream who need the water from the river.
This is Utah. It's a desert. Water's not a real plentiful commodity out here. It's precious and scarce. Most of the easy answers don't work. (If they did, somebody else would already be using the water from that source.)
You can keep pretending that if this bill were to pass it would be a huge problem for the NSA and the feds, but the idea that the Utah government would be able to hold the facility hostage is a ridiculous pipe-dream.
https://www.google.com/maps/place/NSA+Utah+Data+Center/@40.4...
Tell me again why this would be such a problem for the Federal Government in the unlikely event that Utah actually signed this into law and it remained in force in 2021. I'm pretty sure that water access was something taken into account when they selected the location from the data center in the first place, along with the possibility of the water supply being interrupted by sabotage in the event of war.