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 289 ran west from US 89 to the Coronado National Forest boundary. The next year, the route was extended westward to Peña Blanca Dam. By 1971, US 89 at SR 289's eastern terminus was replaced by I-19. Arizona State Route 289 State Route 289 (SR 289) is a highway in Santa Cruz County, Arizona that runs from its junction with Interstate 19 (old ) to the north of Nogales, to Peña Blanca Lake. It is an east–west route. SR 289 is a highway that serves Peña Blanca Lake, passing through sparsely inhabited territory. It does not pass through any cities or