60, US 93, and State Route 89 between Prescott and Flagstaff via Williams. In addition, there was another US 89A in Arizona between Prescott and Flagstaff via Sedona on which is now State Route 89A. In central Arizona, the need for a north–south U.S. Highway was largely superseded by the completion of I-17, which now carries the bulk of the traffic and all of the heavy trucks along this north–south corridor. I-17 connects I-40 in Flagstaff with I-10 in Phoenix, Arizona, along a very hilly route that also passes through the Verde Valley. US 89 in central Utah was discontinuous for most of 1983 due to a landslide that destroyed the town of Thistle and closed the highway for about eight months. From early 2013 to mid 2015, US 89 was closed approximately south of Page, due to a geological event that caused the roadway to buckle and subside. Traffic was being re-routed via of secondary and tertiary roads on the Navajo Nation. US 89T opened on August 29, 2013, a paved portion of a Navajo route to serve as a long-term bypass of the closed section. Major intersections Southern segment Arizona in Flagstaff west-southwest of Tuba City Utah north-northeast of Sevier. The highways travel concurrently to Salina. in Salina. US 50/US 89 travels concurrently through Salina. east-northeast of Thistle. The highways travel concurrently to Spanish Fork. in Provo in Lehi. The highways travel concurrently to Draper. in Murray in South Salt Lake in Salt Lake City in North Salt Lake on the West Bountiful–Bountiful city line. The highways travel concurrently to Farmington. south-southeast of Uintah in Brigham City. The highways travel concurrently to Logan. Idaho in Montpelier. The highways travel concurrently through Montpelier. Wyoming on the Alpine Northwest–Alpine Northeast line. The highways travel concurrently to Moran. in Hoback Junction. US 89/US 189 travels concurrently to Jackson. US 89/US 191 travels concurrently to the southern entrance to Yellowstone National Park north-northwest of Colter Bay Village. in Moran. US 89/US 287 travels concurrently to the southern entrance to Yellowstone National Park north-northwest of Colter Bay Village. Yellowstone National Park segment (unofficial designation) travels concurrently from the park's southern entrance to north-northwest of West Thumb. in West Thumb. The highways travel concurrently to north-northwest of West Thumb. in West Thumb. Northern segment Montana The northern entrance to Yellowstone National Park south of Gardiner in Livingston. The highways travel concurrently to northeast of