The route was formed in 1977 and has preserved its initial state since then.

From that point, the route heads northwest as a two-lane undivided highway, running almost parallel to I-15 in the west and Chicken Creek Reservoir in the east.

[2] The east–west portion of SR-78 between Levan and Elevator Road is a part of the National Highway System.

[3] In 1975, as Interstate 15 was being constructed in the area, State Route 163 was designated along the old alignment of US-91 from I-15 at Mills Junction to SR-28 in Levan.

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