I-70 Speedway was a racetrack near Interstate 70 east of Odessa, Missouri, USA. The track opened in 1969 and was open every year until it closed in 2008. It was built and owned by Bill Roberts who, along with partners, had previously built and owned KCIR Dragstrip on Noland Road in Kansas City, Missouri.
The Inyokern Airport Dragstrip opened in 1954, and was the second oldest continuously operating dragstrip in the United States, behind Thornhill Dragstrip in Kenton, KY which opened in 1953. The drag strip closed during the 2005 season due to new Federal Aviation Administration regulations.
The track hosted NASCAR Craftsman Truck Series races from 1995 to 1999. In 2006, a new 3/8 dirt track was built on the site. The asphalt track is a long 1/2 mile (0.54 mi) with high 30-degree banking in the turns. The back stretch has a small dog-leg. It is regarded as one of the fastest and highest banked short tracks in the nation.
When the track was being built, in the late sixties, a crane was used to pave the turns from outside the retaining wall because nothing was capable of paving embankments that high at the time. It was also one of the first tracks to feature a very early version of the soft-wall.
During a World Cup race in the early 1990s huge styrofoam blocks were placed high along the retaining wall in all the turns. All-Pro Series driver, and former NASCAR Rookie of the Year, Jody Ridley hit one of the blocks which sent him airborne over the wall in turn four upside down.
Ridley walked away from the wreck, but that style of soft wall was only used in a few more races at I-70. I-70 is also one of the few race tracks that offers individual bucket seating for fans instead of bleachers. This unique style of race track seating was designed by Bill Roberts and his good friend Louis Noland.