The Bonneville Salt Flats are a densely packed salt pan in

Tooele County Tooele County ( ) is a county in the U.S. state of Utah. As of the 2010 United States Census, the population was 58,218. Its county seat and largest city is Tooele. The county was created in 1850 and organized the following year. Tooele County ...

in northwestern Utah. A remnant of the Pleistocene Lake Bonneville, it is the largest of many salt flats west of the

Great Salt Lake The Great Salt Lake is the largest saltwater lake in the Western Hemisphere and the eighth-largest terminal lake in the world. It lies in the northern part of the U.S. state of Utah and has a substantial impact upon the local climate, particula ...

. It is public land managed by the

Bureau of Land Management The Bureau of Land Management (BLM) is an agency within the United States Department of the Interior responsible for administering federal lands. Headquartered in Washington DC, and with oversight over , it governs one eighth of the country's la ...

and is known for land speed records at the Bonneville Speedway. Access to the Flats is open to the public. The Flats are about 12 miles (19 km) long and 5 miles (8 km) wide, with a crust almost 5 ft (1.5m) thick at the center and less than one inch (2.5 cm) towards the edges. It is estimated to hold 147 million tons of salt, approximately 90% of which is common table salt.

History

Geologist

Grove Karl Gilbert Grove Karl Gilbert (May 6, 1843 – May 1, 1918), known by the abbreviated name G. K. Gilbert in academic literature, was an American geologist. Biography Gilbert was born in Rochester, New York and graduated from the University of Rochester. D ...

named the area after

Benjamin Bonneville Benjamin Louis Eulalie de Bonneville (April 14, 1796 – June 12, 1878) was an American officer in the United States Army, fur trade, fur trapper, and explorer in the American West. He is noted for his expeditions to the Oregon Country and the Gre ...

, a U.S. Army officer who explored the Intermountain West in the 1830s. In 1907, Bill Rishel and two local businessmen tested the suitability of the salt for driving by taking a Pierce-Arrow onto its surface. A railway line across the Flats was completed in 1910, marking the first permanent crossing. The first land speed record was set there in 1914 by Teddy Tetzlaff. Entertainment filmed at the Flats include portions of ''

Walking with Dinosaurs Special - The Ballad of Big Al ''The Ballad of Big Al'', marketed as ''Allosaurus'' in North America, is a 2000 special episode of the nature documentary television series ''Walking with Dinosaurs''. ''The Ballad of Big Al'' is set in the Late Jurassic, 145 million years ago, a ...

'', '' Knight Rider'', '' Warlock'', ''

Independence Day An independence day is an annual event commemorating the anniversary of a nation's independence or statehood, usually after ceasing to be a group or part of another nation or state, or more rarely after the end of a military occupation. Man ...

'' (1996) and its sequel, ''

SLC Punk ''SLCPunk!'' is a 1998 American comedy-drama film written and directed by James Merendino. The film centers around Steven "Stevo" Levy, a college graduate and punk living in Salt Lake City during the mid-1980s. ''SLCPunk!'' was chosen as the open ...

'', ''Cremaster 2'' from '' Cremaster Cycle'', '' The Brown Bunny'', '' The World's Fastest Indian'', ''

Gerry Gerry is both a surname and a masculine or feminine given name. As a given name, it is often a short form (hypocorism) of Gerard, Gerald or Geraldine. Notable people with the name include: Surname *Elbridge Gerry (1744–1814), fifth US vice presi ...

'', '' The Tree of Life'', '' Top Gear'' and '' Pirates of the Caribbean: At World's End''. Furthermore, the Pontiac Bonneville (former flagship sedan of the Pontiac motor division), the Triumph Bonneville motorcycle, and the Bonneville International media company are all named for the Flats. The Bonneville Salt Flats hosts the annual US Flight Archery Championships. The goal of

flight archery Modern competitive archery involves shooting arrows at a target for accuracy and precision from a set distance or distances. This is the most popular form of competitive archery worldwide and is called target archery. A form particularly popula ...

is to shoot arrows from bows at the greatest distance possible without regard to hitting a target, and so the vast flat plane of the flats serves as an ideal location to measure the linear distance traveled by arrows without geographic interference. Both the 1977 (archer Don Brown) and 1982 (archer Alan Webster) world records were set there; while the current world record, achieved in 1987 (archer Don Brown), was set at the salt flats near Smith Creek, Nevada.

Environmental concerns

Bonneville Salt Flats aerial photo D Ramey Logan

The thickness of salt crust is a critical factor in racing use of the salt flats. The

(BLM) has undertaken multiple studies on the topic; while a 2007 study determined that there was little change in the crust's thickness from 1988 to 2003, more recent studies have shown a reduction in thickness, especially in the northwest area where racing occurs. The flats' overall area has contracted significantly over the past several decades. The cause or causes of this remain unclear, but many believe adjacent evaporative potash mining is the primary factor. Collaboration between racing organizations, the potash mine, and the BLM led to a pilot program begun in 1998 to release excess brine onto the salt flats during winter. Plans to increase the volume of brine returned to the salt flats are hoped to halt loss of crust thickness, or possibly restore it where it has become too thin to sustain human use.

Land speed events

Motorcar racing has taken place at the salt flats since 1914. Racing takes place at part of the Bonneville Salt Flats known as the Bonneville Speedway. There are five major land speed events that take place at the Bonneville Salt Flats. Bonneville "Speed Week" takes place mid-August followed by "World of Speed" in September and the "World Finals" take place early October. These three events welcome cars, trucks, and motorcycles. The "Bub Motorcycle Speed Trials" are for motorcycles only. World records are contested at the Mike Cook ShootOut in September. The Southern California Timing Association and the Utah Salt Flats Racing Association organizes and plans the multi-vehicle events, but all event promoters contribute to prepping and maintaining the salt. "Speed Week" events in August were canceled in 2015 and 2022, due to the poor condition of the salt in certain parts of the flats. The salt flats had been swamped by heavy rains earlier in the year, as usual, but this year the rains also triggered mudslides from surrounding mountains onto a section of the flats used for the land-speed racing courses.

''Stardust''

In 2004, the ''Stardust'' spacecraft released its sample-return capsule for a landing in the Bonneville Salt Flats after its flybys of asteroid

5535 Annefrank 5535 Annefrank (), provisional designation , is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter. It was used as a target to practice the flyby technique that the Stard ...

in 2002 and comet

Wild 2 Comet 81P/Wild, also known as Wild 2 (pronounced "vilt two") ( ), is a comet named after Swiss astronomer Paul Wild, who discovered it on January 6, 1978, using a 40-cm Schmidt telescope at Zimmerwald, Switzerland. For most of its 4.5 billion- ...

in 2004.

References

External links

Bonneville Salt Flats Special Recreation Management Area
-