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 1932 running through the Petrified Forest National Park east of Winslow between then U.S. Route 66 and U.S. Route 260. The road was decertified in 1951 and is now maintained by the National Park Service. SR 63 then appeared again on a state map in 1961 along a route from U.S. Route 66 in Sanders northwest 15 miles. In 1970, it extended north to then U.S. 164. The route disappeared on maps on May 11, 1981 when the route became U.S. Route 191 and US 164 became U.S. Route 160. State Route 65 was a state highway in northern Arizona