Bonneville Speedway

Salduro is a ghost town located on the south boundary of Bonneville Speedway, next to the Western Pacific Railroad. Salt Lake City newspapers ran an advertisement in 1914 for a special train to Salduro where the "fastest machines in the world will compete for the world's record on the famous salt beds, which afford the finest races in America. No dust." Salt Lake City mayor Samuel C. Park and Utah Governor William Spry attended.[4] A rest area on Interstate 80 was built on the former settlement, and a plaque there commemorates the land speed records.

Historically, the speedway was marked out by the Utah Department of Transportation at the start of each summer. Originally, two tracks were prepared; a 10-mile (16 km) long straightaway for speed trials and an oval or circular track for distance runs, which was typically between 10 and 12 miles (16 and 19 km) long depending on the condition of the salt surface.

Since at least the 1990s, track preparations have been the responsibility of the event organizers. Days or weeks in advance, the track preparers identify an area best suited for their track layouts and begin grading the tracks. Surveyors are brought in to survey the timing trap distances. A day before racing begins, the track markers are added.

Originally, the straightaway was marked with a broad black line down its center. This was eventually changed to lines down either side, as the center line wore out too quickly. As the costs for painting the lines has gone up, organizations have switched to flags and cones as track markers. The last event to use black lines was Speed Week, August 2009.[5]

The number of tracks and the timed sections for each track are set according to what is most beneficial for each event. Large public meets such as Speed Week run as many as four tracks with several timed miles, usually starting with the second mile and running to the fifth mile. Smaller meets that typically only run world record attempts will utilize a single track, with one timed mile and one timed kilometer in the middle of the track. Additional marks and cones indicate the end of the track and the position of timing equipment.

BLM interpretive sign at the Bonneville Salt Flats Rest Area on westbound Interstate 80, September 2015

The annual Speed Week was cancelled in both 2014 and 2015, as were many land-speed racing events, due to deteriorating track conditions.[2][3] Heavy rains caused a layer of mud from surrounding mountains to flow onto the flats, covering approximately 6 mi (9.7 km) of the track. Although another section of the flats would normally be used, nearby salt mining operations had reduced the size of the alternative track.[3]

The depth of the salt crust at Bonneville has also been decreasing, possibly leaching into a saltwater aquifer. Measured at as much at 3 ft (0.91 m) in the 1940s and 50s, it has been reduced to just 0.17 ft (0.052 m) in 2015.

Though recent studies have been made (since 1960), the causes of this deterioration are not clear, although the evidence points toward both local climatic changes and salt mining. Some strategies were devised to revert the decreasing salt surface, such as pumping back salt, though this had no effect.[3]

In August, the Southern California Timing Association[6] and Bonneville Nationals Inc.[7] organize Speed Week, the largest meet of the year, which attracts several hundred drivers who compete to set highest speed in a range of categories.

In late August, the Bonneville Motorcycle Speed Trials are held.[8]

In September each year is the World of Speed, (similar to Speed Week) organized by the Utah Salt Flats Racing Association.[9] The USFRA also meet on the first Wednesday of each month throughout the summer.

In October, the Southern California Timing Association puts on World Finals, a scaled-down version of Speed Week.

Each year, there are usually a few private meets that are not publicized scattered among the larger public meets.

Numerous land speed records in various vehicle categories and classes have been set on the Bonneville speed way. In 1960, Mickey Thompson became the first American to break the 400 miles per hour (640 km/h) barrier, hitting 406.60 miles per hour (654.36 km/h) and surpassing John Cobb's 1947 one-way Land speed record of 403 miles per hour (649 km/h). Other notable examples of Bonneville speed records include:

Gabelich's Blue Flame, December 2004

Dick Beith's Pepco Supercharged VW Lakester, August 1963

A Suzuki Hayabusa at Bonneville Speedway, September 2009

Several motor-paced racing speed records have been attempted at Bonneville.

In 1985, British cyclist John Howard set a then world record of 244 km/h (152 mph).

On 15 October 1995, Dutch cyclist Fred Rompelberg achieved 268.831 km/h (167.044 mph), using a special bicycle behind a dragster with a large shield.[13]

In 2016, Denise Mueller-Korenek claimed a women's bicycle land speed record at 147 mph (237 km/h). She was coached by Howard. It is not clear which authority was supervising the record attempt.[14]

In 2018, Mueller-Korenek broke her own women's record and the men's record at a speed of 183.9 miles per hour (296.0 km/h).[15]

In the series finale episode of Mad Men, Donald Draper drives a 1970 Chevrolet Chevelle SS muscle car in the races at Bonneville Speedway.[16] In the film The World's Fastest Indian Burt Munro and his highly modified Indian Scout motorcycle sets a world record.

• Bonneville Motorcycle Speed Trials (BMST)
• Black Rock Desert
• Land speed record
• List of vehicle speed records
• The World's Fastest Indian - a biographical sports drama film involving the Bonneville Salt Flats.
• National Register of Historic Places listings in Tooele County, Utah

• Utah Salt FlatsRacing Association
• Southern California Timing Association/Bonneville Nationals, Inc.
• "One Out Of Three Smashes Up." Popular Mechanics, August 1954, pp. 65–70/240, see page 70.

Wikimedia Commons has media related to Bonneville Speedway.

• Speed Record Club
• Speed Week Travel Guide