 Utah State Route 1, ran through Spanish Fork, being designated as early as 1910, and was later known as U.S. Route 91.Its original alignment entered Spanish Fork from the south along Main Street, travelling north through the city until turning east on 800 North, then leaving the city northeasterly along Childs Road.In 1962, as Interstate 15 was being constructed east and north of the city, the Utah state legislature wanted to have an adequate connection from the interstate to the city, and so they designated State Route 156 as running from SR-1/US-91 north along Main Street to the north Spanish Fork interchange, a distance of .