The overall footprint has shrunk to about half of its peak size in 1994. It's thinned by roughly one-third in the last 60 years. As nearby groundwater replaces the mineral-rich brine, evaporation yields less salt than historic cycles of flooding and evaporation left on the landscape. Research has time and again shown that the briny water in the aquifer below the flats is depleting faster than nature can replenish it. The glistening white terrain of the Bonneville Salt Flats, a remnant of a prehistoric lakebed that is one of the American West's many other-worldly landscapes, serves as a racetrack for land speed world records and backdrop for movies like 'Independence Day' and 'The World's Fastest Indian.'īut it's growing thinner and thinner as those who cherish it clamor for changes to save it. It's so flat that on certain days, visitors swear they can see the curvature of the earth. In the Utah desert, a treeless expanse of pristine white salt crystals has long lured daredevil speed racers, filmmakers and social media-obsessed tourists. Jeremiah Bernau The race to save Bonneville Salt Flats.

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