These routes were re-aligned or truncated after the Interstate Highway System was constructed through this part of Utah.

From its western terminus at Interstate 15 in Santaquin, the route heads north-northeast until reaching Payson, where it straightens out to the north.

The highway veers northeast and eventually to the north-northeast until Spanish Fork, where it runs north again.

[8] With the construction of I-15 in the area, SR-1 was moved to the new Interstate in 1964, and the old route from Santaquin to Spanish Fork became an extension of SR-26, which was continued east to Moark Junction, replacing SR-105.

The Utah Transportation Commission submitted a request for a realignment to the American Association of State Highway Officials (AASHTO) in 1994, moving US-6 onto I-15 and SR-214 in order to follow AASHTO policies for following the "shortest routes and the best roads".