Setting Records on the Bonneville Salt Flats. ca. 1937, Utah, USA, 968. BONNEVILLE SALT FLATS-WORLD'S FASTEST SPEEDWAY-NEAR GREAT SALE LAKE, UTAH. SIR MALCOLM CAMPBELL IN THE 'BLUEBIRD' DOING OVER 301 MILES PER HOUR. The Bonneville Salt Flats is a salt deposit left by the receding of ancient Lake Bonneville which at one time covered about 20,000 sq. miles. This Salt Deposit covers about 159 sq. miles that extend about 9 miles along Western Pacific R. R. Salduro Station lies at about the center.