It then enters North Salt Lake and Davis County for a short distance before reaching I-15 northwest of the city center.

From here, the freeway travels southeast along the Salt Lake Valley's east bench with three lanes in each direction.

The freeway enters Murray as an interchange serving westbound motorists connects to 280 East and State Street (U.S. Route 89, or US-89).

The route enters West Valley City and encounters 3500 South (SR-171), where its eastbound lanes have a grade-separated ramp to northbound I-215.

The road turns northeast and enters an industrial area of western Salt Lake City.

Past 2100 North, the freeway enters rural Davis County, and the road curves to the northwest.

The proposed route would have bisected the primarily residential Holladay suburb, as well as the southern portion of Murray.

After more than two years of hearings and widespread opposition from residents, the Highway Department released their proposed routing in June 1960, which placed the southeast quadrant where it runs today.

[9][10] This portion of road was extended east to I-15 in North Salt Lake and upgraded to freeway standards by 1969.

[11] Construction of the southeast quadrant from I-80 (at the time replacing US-40) at Parley's Canyon to 4600 South in Holladay began in mid-1965.

Land acquisition was also taking place for the rest of the southeastern quadrant between 300 East in Murray and 4600 South in Holladay.

However, a citizens' group named Cottonwood Inc. halted right-of-way acquirements due to the lack of an environmental impact statement (EIS).

[5] After 1976, gaps in the belt route were present from 2100 North near the airport to SR-201 and from State Street in Murray to 4600 South in Holladay.

The first step in completing the gap was taken in June 1979, when construction of the Interstate from State Street to 700 East began.

[18] The western quadrant of the freeway was completed in October 1988, closing the gap between SR-201 and I-80 (however, the California Avenue interchange wasn't opened until mid-1989).

[25] As part of the original proposal of a belt route through Salt Lake City, the southeastern quadrant received the designation of I-415.