Question: What mountains range does the high mountain pass through at an elevation of 6820 ft that has part of the Interstate Highway System that runs from San Diego, California, to Sweetgrass, Montana ?
Sentence (from "Monida Pass"): Monida Pass is a high mountain pass in the Rocky Mountains of the northwestern United States, at an elevation of 6820 ft (2079 m) above sea level on the Union Pacific Railroad and 6870 ft (2094 m) on adjacent Interstate 15.
Relevant evidence: Yes