About U.S. Highway 160
U.S. Highway 160 runs 1,465 miles through Arizona, a small bit of New Mexico, Colorado, Kansas and Missouri. It's western terminus is at the junction with U.S. Highway 89, a few miles west of Tuba City, Arizona. The eastern terminus is at a with junction of U.S. Highway 67 and Missouri Route 158, near Poplar Bluff, Missouri.
Originally, Highway 160 ran from Springfield, Missouri to Trinidad, Colorado. The endpoints were moved a few times. In 1939, all of U.S. Highway 450, which ran from Cortez, Colorado to Crescent Junction, Utah was added to it. In 1970, that portion was dropped, and it was given its present route to Tuba City.
In Arizona, Highway 160 passes through the desert terrain of the Navajo Nation Indian Reservation. It passes right by the Four Corners Monument, and through a one-mile stretch through New Mexico. Then it crosses into Colorado, where it crosses the San Juan River. It traverses all of Colorado and Kansas, staying close to their southern borders. It ends near the southern border of Missouri.