US-26 West/BL-15 South (Yellowstone Highway) at US-91. Turn right on Sunnyside Road to continue west on US-26, BL-15 South, and for I-15. Continue straight on Yellowstone Highway for US-91. This is the beginning of US-91 southbound.
End US-91 North at US-26/BL-15
Northern end of US-91 north at US-26 and BL-15. US-91 was recently extended, when US-26 was rerouted to the new Exit 116 interchange on I-15.