 Just before reaching former SR-181, SR-171 becomes much steeper than at any point to the west (other than when it ducks under the Union Pacific-"FrontRunner" right-of-way), and from there it continues to climb the East Bench foothills until its terminus at I-215 in Millcreek.The entire route is included as part of the National Highway System.3300 South/3500 South was added to the state highway system west of State Street on April 24, 1916, along with 8400 West north to 2100 South (which was already a state highway); on November 13 of that year, East 3300 South to a connection with the old Territorial Road in Parley's Canyon (also already part of the system) became a state highway.