History
The state legislature defined State Route 73 in 1933, running from SR-68 (created in 1931) west of Lehi southwest via Cedar Fort, Fairfield and Topliff to SR-36. Up until Fivemile Pass, beyond Fairfield, this followed the present route of SR-73, but at Fivemile Pass the route curved southwesterly, generally following the former Fairfield Branch of the Union Pacific Railroad. Two years later, the portion west of Fairfield was dropped, in favor of a routing south from Fairfield to SR-26 (now US-6) near Eureka. State Route 180 was also created in 1935, beginning at SR-36 south of Stockton and heading east through Ophir Canyon to Ophir and southeast through the Oquirrh Mountains to Mercur. State Route 202 was defined in 1939 as an eastern approach to Mercur, splitting off SR-73 north of Fairfield and climbing Manning Canyon, and in 1941 the portion of SR-180 between Ophir and Mercur was removed from the state highway system, with an extension of SR-202 west down Mercur Canyon to SR-180 replacing it.
SR-73 was realigned again in 1945, turning southwest between Cedar Fort and Fairfield, absorbing the beginning of SR-202, and continuing southwest to a point between Fairfield and Fivemile Pass. The remainder of the route followed its present alignment to SR-36, replacing the portions of SR-202 and SR-180 that lay outside the canyons in the Rush Valley. The part of former SR-73 from Fairfield north to the junction south of Cedar Fort became State Route 191, while the part south of Fairfield was given to the county. SR-202 was cut back to only the portion in Mercur Canyon, with the Manning Canyon piece dropped. Finally, a connection from the Deseret Chemical Depot north to SR-73 near its west end, constructed with federal aid in 1942, was numbered State Route 198. In short, SR-73 now connected SR-36 to SR-68, with four spurs from west to east: SR-198 to the chemical depot, SR-180 to Ophir, SR-202 to Mercur, and SR-191 to Fairfield.
Over the next two decades, all four spurs disappeared. The first two to go were SR-191 and SR-202, both eliminated in 1953. This completely removed Mercur from the state highway system, but Fairfield was kept by moving SR-73 to its current alignment through that community. SR-180 was eliminated in 1961, and SR-198 was deleted in 1969. Due to a southerly extension of SR-68 in 1960, splitting at the SR-73 intersection, the portion of SR-68 into Lehi was renumbered as an extension of SR-73, which gained its current length at that time.
Read more about this topic: Utah State Route 73
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