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By the late 1970s, the Utah portion of I-80—except for a gap on the western edge of Salt Lake City—was largely complete. A 4.5-mile-long (7.2 km) section between Redwood Road and Salt Lake City International Airport is the final link of the transcontinental freeway to be completed. [47]
The longest is Interstate 15 (I-15) at 400.592 miles (644.690 km) and the shortest is I-215 at 28.946 miles (46.584 km). One unique former route is Interstate 415, which was never signed as such, and was only used as a temporary designation for the eastern portion of what is now the Interstate 215 belt loop around Salt Lake City. [2]
Corner of 300 West and North Temple st in Salt Lake City: South Salt Lake — — Routed along 300 West in Salt Lake City. Co-signed US 91 ALT US 89A — — North Salt Lake: Farmington: c. 1930 — Former US 89/91, Modern SR 106: US 91 Alt. — — Corner of 300 West and North Temple St in Salt Lake City: South Salt Lake — — Cosigned US 89 ...
In March 2022, the Utah Department of Transportation initiated an Environmental Impact Statement (EIS) for the Interstate 15 (I-15) Farmington to Salt Lake City Project. A 2019-2050 Regional Transportation Plan includes two projects that identify improvements to I-15 in Davis and Salt Lake Counties:
The terminus of I-215 at I-80, to the east of Salt Lake City. I-215 begins at an interchange at the mouth of Parley's Canyon in Millcreek near the southeast corner of Salt Lake City that connects I-80, Foothill Drive (State Route 186, or SR-186) and Parleys Way. At this point, I-215 splits into three legs, connecting I-80 toward Salt Lake City ...
State Route 201 (SR-201) is an east–west expressway and freeway located in Salt Lake County in the U.S. state of Utah.Colloquially known by some as the 21st South Freeway, [2] the route serves as an alternative to Interstate 80 (I-80) through Salt Lake City.
In Provo, US-89 meets US-189, its only branch, which heads northeast through Provo Canyon to Heber City, connecting to I-80 and bypassing Salt Lake City. North of Lehi, US-89 merges with I-15 (at exit 282), which has been built on or near the old road through a gap in the Traverse Mountains (elevation 4800 feet/1500 m) into the Salt Lake Valley .
The "Spaghetti Bowl"Two major interstate highways, Interstate 15 and Interstate 80, intersect just west of downtown.I-15 comes in from the north end of the state, through Davis County, and heads straight south through the Salt Lake Valley and on through Utah County to leave the state on its southwest corner.