From here it travels north approximately 2.5 miles (4.0 km) north to its terminus at the south boundary of Cedar Breaks National Monument.

[1] While the route ends here, continuing north along the road into the park leads to Utah's Patchwork Parkway/Brian Head-Lake Panguitch Scenic Byway (SR-143).

[2][4] State Route 55 was designated by the Utah State Legislature in 1927, connecting SR-14 at Cedar Breaks Junction with the southern boundary of Cedar Breaks National Monument.

[5] In 1985, the southern portion of SR-143 between SR-14 and the southern Cedar Breaks National Monument boundary was re-designated State Route 148, with no further changes to this highway.

[6] The entire route is in rural Iron County.