State Route 720 begins at a junction with
U.S. Route 95 (US 95) approximately south of downtown Fallon. From there, the highway runs due east along Union Lane, a two-lane road which passes through agricultural areas. After about , Union Lane ends at an intersection with Pasture Road adjacent to Naval Air Station Fallon. SR 720 turns to follow the two-lane Pasture Road north another to an intersection with Cottonwood Drive at the main entrance to NAS Fallon. ==History==