List of Interstate and U.S. Highways in Utah

List Of Interstate And U.S. Highways In Utah

Three numbered highway systems are present in the U.S. state of Utah: the Interstate Highway System, the United States Numbered Highways system (more commonly known as "U.S. Routes") and the state route system. Both the Interstate and U.S. Highway system are nationwide systems with only a small portion of these routes entering Utah. The Utah Department of Transportation is responsible for maintaining all of the Interstate, U.S. Routes and state highways in the state. Originally, the State Road Commission of Utah, created on March 23, 1909 was responsible for maintenance, but these duties were rolled into the new Department of Transportation in 1975.

There are 3,039.643 miles (4,891.831 km). of Interstates and U.S. Routes in Utah, comprising 977.664 miles (1,573.398 km) of Interstate highways and 2,061.979 miles (3,318.434 km) of U.S. Routes. The longest Interstate is Interstate 15 at 400.592 miles (644.690 km) and the shortest being Interstate 215 at 28.946 miles (46.584 km). The longest U.S. Route is U.S. Route 89 at 502.577 miles (808.819 km) and the shortest being U.S. Route 89A at 2.94 miles (4.73 km).

Five former U.S. Routes exist in the state of Utah, as well as two former interstate highways, all which have been replaced by current interstate and U.S. Routes, with the most recent change being U.S. Route 666 changing to U.S. Route 491 in 2003. One unique former route would be 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.

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