List of Interstate Highways in Utah
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. There are of Interstates within the state. The longest is Interstate 15 (I-15) at and the shortest is I-215 at . 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.
U.S. Route 730
US 730 runs in Oregon and Washington and is listed as part of the National Highway System, a system of roads crucial to the nation's economy, defense and mobility, from its western terminus at I-84 east of Boardman to the end of its concurrency with US 395 in Umatilla. As a state highway in both states, the roadway is maintained by the Oregon Department of Transportation (ODOT) and Washington State Department of Transportation (WSDOT). US 730 has the highest designation of any United States Numbered Highway, or U.S. route, and is the shortest highway in the system. The highway is defined by the Washington State Legislature as SR 730, part of the Revised Code of Washington as §47.17.821.