Spanning just 1.38 miles (2.22 km), it connects the city of Spanish Fork, via Main Street, with Interstate 15 on the north side of town.

[1] From there, the route travels north along Main Street through the center of town for 1.3 miles (2.1 km) until ending at an interchange with I-15 / US-6.

[2] In doing so, the southern terminus of SR-56 was moved south 1 mile (1.6 km) to its current location, which at the time was an intersection with US-6.

What was the original portion of the route was now a spur to connect the interstate, while the main alignment now turned east on 800 North to follow the former SR-1 along US-91.

[2] In 1992, because of safety problems at "Maggie's Bend", where SR-156 turned from 800 North onto Childs Road in eastern Spanish Fork, caused in part by superelevation of the curve, 800 North was given to the city and the state took over Childs Road, with the original northern end of the route that had served as a spur returned to the mainline, and the portion along Childs Road to Springville became a new state route, SR-51.