Circuit Type Seasons Total Races Bridgehampton Circuit Road course 1966-1969 4 Caesars Palace Street circuit 1981-1982 2 Charlotte Motor Speedway Oval 1978-1979 2 Dallas Street Circuit Street circuit 1984 1 Donnybrooke International Road course 1970-1972, 1979-1980, 1984 6 Edmonton International Road course 1968-1973, 1981 7 Green Valley Raceway Road course 1984 1 Laguna Seca Raceway Road course 1966-1973, 1977-1982 14 Lime Rock Park Road course 1983-1985 4 Michigan International Oval 1969 1 Mid-Ohio Sports Car Course Road course 1969-1974, 1977-1978 12 Mont-Tremblant Circuit Road course 1966, 1969-1971, 6 Mosport Park Road course 1966-'67, 1969-'74, 1977-'86 24 Riverside International Road course 1966-'73, 1977-'82, 1984 15 Road America Road course 1967-1974, 1977-1983 15 Road Atlanta Road course 1970-'74, '78-'80, '82, '84 10 Sears Point Raceway Road course 1977, 1980, 1983-1984 4 Stardust International Road course 1966-1968 3 St. Louis Raceway Park Road course 1985-1986 2 St. Petersburg street circuit Street circuit 1985 1 Summit Point Motorsports Road course 1986 1 Texas World Speedway Oval 1969 1 Trois-Rivières Street Circuit Street circuit 1977-1984 8 Watkins Glen International Road course 1969-1974, 1977-1981 11 just sayin'