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 180A at a junction with SR 61 near the community of Concho. SR 180A now serves as a bypass route for eastbound traffic wishing to avoid St. Johns. SR 180A has no junctions with any highways aside from its endpoints. The route was established by the Arizona Department of Transportation in 1974. Since then, the route remains as defined. Arizona State Route 180A State Route 180A (SR 180A) is a highway in Apache County, Arizona, that runs from its junction with US 180 to SR 61 west of St. Johns. It is an east–west route for the entirety of its length,