Monida Pass is a high mountain pass in the northern Rocky Mountains of the western United States, at an elevation of 6,870 feet (2,094 m) above sea level on Interstate 15, and 6,820 feet (2,079 m) on the Union Pacific Railroad. 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.