 In 1919, when the state legislature redefined the state road system to include only a short list given in the law and any federal aid projects, West 3300 South remained as part of the Lincoln Highway, and became part of SR-4 and US-40 in the 1920s, but East 3300 South was given back to the county until 1935.That year, the legislature created State Route 171, occupying that street from State Street (by then designated SR-1 and US-91) east to Wasatch Boulevard (just east of present I-215).SR-210 was created in 1941, beginning at SR-4 (now I-80) at the mouth of Parley's Canyon and running south on Wasatch Boulevard to Little Cottonwood Canyon; that route was truncated in 1945, and the portion on Wasatch Boulevard between SR-171 and SR-4 became an extension of SR-171.