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You are correct. The amount of weight necessary to dive the Great Salt Lake is about twice what is necessary in the ocean. However, the salinity of the lake various much depending on how high the water is, which will change its density, and how much weigh might be necessary. Generally it is not dived unless someone loses something in it. Also, Willard Bay, part of the Lake is fresh water.I would never dive the Great Salt Lake. It doesn't seem fun. I met someone that did a boat recovery in it and had to wear over 50 lbs of weights. It's also an average of 14 feet deep. My favorite is Fish Lake. It's cold and high altitude diving, but has great visibility and lots of fish.
Back in the early 1990's, we used to float the "A" Section of the Green River below Flaming Gorge Dam in scuba gear. Floating the river involved having a support raft with some extra air tanks along for the trip. Basically, we'd float with inflated BCDs and snorkel until we saw something we wanted to submerge to look at. Water clarity was amazing. Of course back in those days, I could tolerate the extremely cold water in a 7mil wetsuit. The sizes and numbers of trout were amazing.