High Quality Content by WIKIPEDIA articles! State Road 597 (NM 597) is a 0.447-mile (719 m) long state highway located entirely in the Navajo Nation, which is located in San Juan County, New Mexico, United States. The highway serves to link the U.S. Route 160 (US 160) to the Four Corners Monument. The highway is the second shortest highway in New Mexico, with the shortest being NM 446 measuring 0.250 miles (402 m).