As a part of I-15's reconstruction and then-Salt Lake City Mayor Deedee Corradini's project that included The Gateway, the viaducts were drastically shortened.

As part of I-15's construction in the 1960s, planners felt that two one-way streets with many lanes leading to and from the freeway would be better utilized.

The one-way streets continue (as non-state highways) east of US-89 to the block west of Trolley Square before becoming two-way and then intersecting SR-71.

[4] The entirety of SR-269, as well as the city-maintained portions of 500 and 600 South between State Street and 700 East/SR-71, is included in the National Highway System.

As I-15 was being constructed through the Wasatch Front, the State Road Commission designated three routes—SR-268, SR-269, and SR-270—in 1960 as direct connections into Salt Lake City's downtown.

Since the final design included a bridge over SR-176 on 600 South, the eastbound direction was extended one block to 200 West[7] in 1963.

Mayor Corradini wanted to revitalize an industrial portion of Salt Lake City with her Gateway project.

Mitigation for the removal of the lines was nevertheless necessary; most notably, the Salt Lake City Intermodal Hub was built at 600 West to replace the functions of the Rio Grande and Union Pacific stations, both of which are now isolated from the former mainlines that connected to them from the south by traffic streaming to and from I-15 on SR-269 (as part of The Gateway development, the lines from the north were cut too).