Riverside

Riverside International Raceway stood in Moreno Valley, California, in Riverside County. The complex opened in 1957 and operated until 1989. It had several layouts, including road courses and ovals, as well as a dragstrip. James E. Peterson designed several of the layouts. The first races were held on 21 and 22 September 1957.

The track was altered a number of times over the years. In 1962 a shorter version was created, with a straight that bypassed the seventh corner. In 1967 the first corner was widened by around 21 metres. In 1969 the ninth corner was rebuilt: it received a left-hand kink leading into a wider, banked right-hander. Permanent grandstands and a move of the control tower to the second corner were also announced. In its final form the track had nine corners.

Riverside hosted Formula One only once. On 20 November 1960 the United States Grand Prix was run here as a round of the World Championship, and Stirling Moss won in a Lotus. In 1961 the Grand Prix moved to Watkins Glen. A Formula One race announced for 1967 was swapped for a USAC event, and the United States Grand Prix West planned for 1972 never took place.

Riverside also staged NASCAR races, the Los Angeles Times Grand Prix for sports cars and off-road racing. From 1963 to 1988 there was at least one NASCAR race every year. The last major events took place in 1988, and operations ended in 1989. Much of the site is now occupied by a shopping district with the Moreno Valley Mall, which opened in 1992.