<P> A 2014 study used tree rings collected in the watershed of the Great Salt Lake to create a 576 - year record of lake level reconstruction . The lake level change is strongly modulated by Pacific Ocean coupled ocean / atmospheric oscillations at low frequency, and therefore reflects the decadal - scale wet / dry cycles that characterize the region . By capturing these climate oscillations as well as utilizing the tree - ring reconstruction of lake level change, researchers were able to predict the lake level fluctuation onward for as long as 5--8 years . </P> <P> The Great Salt Lake differs in elevation between the south and north parts . The causeway for the Lucin Cutoff divides the lake into two parts . The water - surface elevation of the south part of the lake is usually 0.5 to 2 feet (15--61 cm) higher than that of the north part because most of the inflow to the lake occurs from the south . </P> <P> Most of the salts dissolved in the lake and deposited in the desert flats around it reflect the concentration of solutes by evaporation; Lake Bonneville itself was fresh enough to support populations of fish . More salt is added yearly via rivers and streams, though the amount is much less than the relict salt from Bonneville . </P> <P> The salinity of the lake's main basin, Gilbert Bay, is highly variable and depends on the lake's level; it ranges from 5 to 27% (50 to 270 parts per thousand). For comparison, the average salinity of the world ocean is 3.5% (35 parts per thousand) and 33.7% in the Dead Sea . The ionic composition is similar to seawater, much more so than the Dead Sea's water; compared to the ocean, Great Salt Lake's waters are slightly enriched in potassium and depleted in calcium . </P>

Where does the salt come from in the great salt lake
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