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. On the Continental Divide in the Bitterroot Range, it marks the transition between the Beaverhead Mountains and the Centennial Mountains. Its name is derived from the states that it separates, "Mon" from Montana and "-ida" from Idaho.