From there, the highway runs due east along Union Lane, a two-lane road which passes through agricultural areas.

After about 3 miles (4.8 km), 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 0.25 miles (0.40 km) to an intersection with Cottonwood Drive at the main entrance to NAS Fallon.

[1][2] The alignment of present-day Union Lane appears on maps as early as 1937, although it formerly extended further east prior to the creation of NAS Fallon.

[3] By 1957, the roadway existed in its current form albeit without a recognized state highway number,[4] and was fully paved by 1969.