
In pre-historic, pre-human, and pre-Bonneville Speed Week times, there was a body of water in western Utah known as Lake Bonneville.
You can’t blame everything on potash mining.
Today, however, the salt on the flats is a fraction of the thickness it was at its peak, as factors including nearby potash mining have threatened its viability. For close to a hundred years, racers have used the concrete-hard flats for land speed record runs, its miles and miles of expanse allowing for vehicles to reach upwards of 600 mph.
Thousands of years ago, a giant body of salty water called Lake Bonneville covered much of the state of Utah, the remnants of which make up the Great Salt Lake as well as the Bonneville Salt Flats.