[6][citation needed] A new alignment around Tremonton and Garland was defined in 1935, with the old route becoming SR-82.

When SR-154 was removed from the state highway system in 1969, SR-84 was extended farther east over part of it to SR-69 (now SR-38) near Collinston.

[8] By 1982, proposed I-15 had been moved west to its current alignment north of Tremonton, and a new SR-129 was created to connect it with Riverside along present SR-30.

SR-13 was extended north from Riverside to I-15 at exit 392 near Plymouth in 1988, replacing what had been maintained as temporary I-15.

Media related to Utah State Route 13 at Wikimedia Commons