Continental Divide Raceways
2.66 Mile Road Course
Castle Rock, Colorado
All races USAC sanctioned
| Race # | Date | Race | Miles | Winner |
| 1 | 7/7/1968 | Rocky Mountain 150 | 151.62 | A. J. Foyt |
| 2 | 7/6/1969 | Rocky Mountain 150 | 151.62 | Gordon Johncock |
| 3 | 6/28/1970 | Rocky Mountain 150 | 151.62 | Mario Andretti |