State Route 78 (Arizona–New Mexico) State Route 78 (Arizona–New Mexico) Arizona State Route 78 (SR 78) and New Mexico State Road 78 (NM 78) are a pair of adjoining state highways located in eastern Arizona and western New Mexico linking U.S. Route 191 (US 191) and Arizona State Route 75 near Greenlee County Airport to US 180 northwest of Cliff, New Mexico. It is also known in its Arizona stretch as Mule Creek Road. The western terminus of SR 78 is located at a junction with US 191 and SR 75 at Three Way, Arizona near Greenlee County Airport. The highway heads northeast from this
Arizona State Route 71 1936. Prior to 1934, the SR 71 designation was given to a road from US 180 near Safford to US 60 in Eagar. This previous incarnation of SR 71 had existed since 1927 and was part of the original state highway system introduced by the Arizona State Highway Commission on 9 September 1927. SR 71 was absorbed into SR 81 in 1934 and subsequently SR 81 became an extension of US 666 (now US 191). Arizona State Route 71 State Route 71 (or SR 71) is a state highway in central Arizona that stretches between its northeast terminus at its