>>215964665 (OP)
No. The Great Salt Lake is different than the Aral Sea. If the California Water Project / theft were to be stopped, the GSL's water level would not rise. This is because the water is salty and totally unusable for agriculture so it is not drained away as the Colorado River / Colorado's water is. This is 100% a climate change problem. The world is getting hotter and Utah's desert is getting slightly hotter every year. There is simply not enough rain to refill the lake and, as lake levels decrease, the salt concentration increases. It is the same process that killed all the fish in the dead sea.
Affecting this is another problem: The Great Salt Lake is very polluted from the nearby copper smelter. The heavy minerals sank to the bottom of the lake where they have mixed with the radioactive nuclear fallout from nearby nuclear bomb testing. Because of this the lake is more acidic than normal and slightly radioactive, and both rise as the water level decreases. Eventually, by 2030 enough of the lakebed will be exposed whereby the wind will kick up the fallout/heavy metal mix back up into the air in very nasty shredded metal radioactive dust storms. We have been warned about this for decades but half the state doesn't believe in ecology or geology or chemistry because god will provide. God will completely destroy the LDS's real estate business once this happens.
This doesn't concern the national government because if the lake goes away, only ranchers get fucked and not the copper smelter, railroad or supercomputer all of which will continue operating (mostly) normally.