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
Former state routes in Arizona 69 never extended south or east beyond the southern end of the Black Canyon Freeway, and T-69 never linked to Route 69. State Route 81 was a state highway in eastern Arizona that served Lyman Lake State Park from 1962–2003, traversing from its start at U.S. Route 180 / U.S. Route 191 between St. Johns and Springerville to Lyman Lake. The Arizona Department of Transportation turned the road over to the Arizona State Parks Department in June 2003 as it was contained within a state park. SR 81 was the shortest state highway in Arizona before State Route 280 was