Interstate 86 (I-86) is an intrastate Interstate Highway, located entirely within the state of Idaho. It runs 63 miles (101.4 kilometers) from an intersection with Interstate 84 located approximately 7 miles (11.3 kilometers) east of Declo in rural Cassia County, to an intersection with Interstate 15 at Pocatello. Interstate 86 connects the major eastern Idaho cities of Pocatello and Idaho Falls with the Twin Falls area and other cities in the state's Magic Valley region. Prior to the designation of Interstate 2 on May 30, 2013, Interstate 86 in Idaho was the shortest east-west route in the Interstate Highway System which is not a special route.