 The state legislature created State Route 186 in 1935.Its original route began at US-89/US-91 (now solely US-89) at the corner of State Street and 400 South, and followed the present route east to the University of Utah, but then it turned north with a gap through the university grounds, west on 200 South, and south on 1300 East to end at 2100 South, then US-40.Legislatively designated as SR-186 by the state, this was signed and treated as US-40 Alternate (US-40A) otherwise.