List of Interstate and U.S. Highways in Utah - Interstate Highways

Interstate Highways

Route number Length Western / southern terminus Eastern / northern terminus Counties Description Map Ref.
015 ! I-15 400.592 !400.592 miles (644.690 km) I-15 at the Arizona state line towards Littlefield I-15 at the Idaho state line towards Malad City Washington, Iron, Beaver, Millard, Juab, Utah, Salt Lake, Davis, Weber, Box Elder Interstate 15 crosses through the entire state, starting in the south from Saint George, up through the middle of the state where it intersects I-70, and into the Salt Lake Valley to meet with I-215 and I-80. After leaving the valley, I-15 continues north, where it becomes concurrent with I-84 until the split in Tremonton, where I-15 heads north into Idaho.
070 ! I-70 231.673 !231.673 miles (372.842 km) I-15 near Cove Fort, UT I-70 / US 6 / US 50 at the Colorado state line towards Grand Junction Millard, Sevier, Emery, Grand Interstate 70 begins in Utah near Cove Fort, not passing through any major metropolitan areas of Utah, and serves as a long-haul route to Denver and the east coast. A stretch of 110 miles (180 km) exists on the highway without any services available.
080 ! I-80 196.680 !196.680 miles (316.526 km) I-80 at the Nevada state line in Wendover I-80 / US 189 at the Wyoming state line towards Evanston Tooele, Salt Lake, Summit Interstate 80 enters from Wendover and crosses the Bonneville Salt Flats before entering the Salt Lake Valley, briefly becoming concurrent with I-15 before leaving the valley through Parley's Canyon, meeting the end of I-84 and enters Wyoming.
084 ! I-84 119.773 !119.773 miles (192.756 km) I-84 at the Idaho state line towards Burley I-80 near Echo Box Elder. Weber, Davis, Morgan, Summit I-84 enters in Snowville and soon becomes concurrent with I-15 until it splits off in Roy, and enters Weber Canyon before ending at I-80 in Echo
215 ! I-215 028.946 !28.946 miles (46.584 km) I-80 at Parley's Canyon I-15 in North Salt Lake Salt Lake, Davis 270 degree belt route around Salt Lake City

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