160 km.

U.S. Route 160 (US 160) is a 1,465-mile-long (2,358 km) east–west United States Numbered Highway in the Midwestern and Western United States. The western terminus of the route is at US 89 five miles (8.0 km) west of Tuba City, Arizona. The eastern terminus is at US 67 and Missouri 158 southwest of Poplar Bluff, Missouri.
Its route, if not its number, was made famous in song in 1975, as the road from Wolf Creek Pass to Pagosa Springs, Colorado in C.W. McCall's country music song "Wolf Creek Pass".

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