Highway markers for Interstate Highways | |
 Interstate Highways highlighted in red | |
| Highway names | |
|---|---|
| Interstates | Interstate nn (I-nn) |
| System links | |
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The Interstate Highways in Utah are maintained by the Utah Department of Transportation (UDOT). The Interstate Highway System is a nationwide system with only a small portion of these routes entering Utah. Originally, the State Road Commission of Utah, created on March 23, 1909 was responsible for maintenance, but these duties were rolled into the new UDOT in 1975.[1] There are 977.664 miles (1,573.398 km) of Interstates within the state. 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]
- ^ "Utah State Archives Catalog". Utah State Archives. Retrieved July 29, 2008.
- ^ "SR-215 History" (PDF). State Road Commission of Utah. October 14, 1968. Retrieved July 29, 2008.