SR-28 begins at an intersection with US-89 in central Gunnison and heads north and northwest to Fayette. It continues northwest past the Sevier Bridge Reservoir and northeast past the Skinner Peaks and Horse Heaven Mountain to Levan. SR-28 then continues north through Levan to Nephi, where it intersects I-15 at the south end of town and continues north along the I-15 Business Loop through Nephi, ending at an intersection with I-15 north of town. The portion of SR-28 between US-89 and the I-15 interchange south of Nephi is part of the National Highway System.
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History
The Utah State Legislature added the road from US-89 in Gunnison north to US-91 in Levan to the state highway system in 1925 and numbered it SR-28 in 1927. For the next 40 years, SR-28 served as a connector between Utah's two major north-south US highways. However, perhaps in preparation for the eventual replacement of US-91, which was being quickly superseded by the new Interstate 15 freeway, in 1968, the legislature redesignated several portions of US-91 with new numbers: SR-163 from the point where US 91 diverged from I-15 at a proposed interchange west of Levan eastward to that town, an extension of SR-28 from Levan northward along old US 91 to a proposed interchange with I-15 two miles south of Sheep Lane, and State Route 41 from another interchange one-half mile south of Sheep Lane through Nephi to the north end of the bypass. These changes left a section of old US 91 between the two interchanges approximately in length which would become a local road. The portion of I-15 west of Levan and south of Levan was one of the last two sections of the freeway to be completed in Utah. Well into the mid 1980s, traffic between Mills Junction and the south Nephi interchange was routed on old US 91, along the routes today designated as SR-78 and SR-28 with the route being marked on maps as Temporary 15. When I-15 was finally built around Levan and Nephi in the 1980s, it was built further to the west than originally planned and without any intermediate interchanges. The freeway crossed old US-91 between the two communities. Because only one interchange was constructed south of Nephi instead of the two which were originally envisioned, the two different highways which were supposed to have endpoints at the two interchanges, both had endpoints at the same interchange. This meant that the north end of SR-28 and south end of SR-41 were in the same place. This was changed in 2006, when SR-28 was extended north to absorb all of SR-41.
