The Utah segment of US 89A was first commissioned as part of State Route 11. This highway ran from Nephi to the Arizona state line near Kanab. This route is still drivable as the modern US 89A, US 89, and SR-132. With the establishment of the United States highway system in 1926, most of SR-11 was used for the routing of US 89 through southern Utah; the internal designation used by state agencies remained SR-11. In 1969, as part of a series of changes to state routes, the portion north of Sevier Junction (I-70 and US 89 near Joseph) was transferred to other routes, removing the only part of State Route 11 that was signed with the state designation. It is also during this time that a new alignment for US 89 was constructed to serve the Glen Canyon Dam, with SR-11 being now signed as US 89A south of Kanab and US 89 to the north. As part of the 1977 Utah state route renumbering to conform signage and legislative definitions, SR-11 was truncated to what is now signed US 89A. The route was signed SR-11, with "TO US 89A" at the northern terminus in Kanab and a "TO US 89" at the Arizona state line. In 2008, however, SR-11 was deleted after a bill in the Utah legislature was passed to restore U.S. Route 89A in Utah.