Interstate 15 in Utah partially coincident with U.S. Route 89 in Utah
Interstate 15 (I-15) runs north–south in the U.S. state of Utah through the southwestern and central portions of the state, passing through most of the state's population centers, including St. George and those comprising the Wasatch Front: Provo–Orem, Salt Lake City, and Ogden–Clearfield. It is Utah's primary and only north–south interstate highway, as the vast majority of the state's population lives along its corridor; the Logan metropolitan area is the state's only Metropolitan Statistical Area through which I-15 does not pass. In 1998, the Utah State Legislature designated Utah's entire portion of the road as the Veterans Memorial Highway.Ogden area
After entering Davis County, the city of North Salt Lake, and the Ogden–Clearfield metropolitan area, I-15 has the southbound on- and offramps for the Beck Street (US 89) interchange. Next is the junction between I-15 and I-215 (Belt Route), which only provides a southbound offramp from I-15 to I-215 and a northbound onramp from I-215 to I-15. Just after this is another partial interchange that only includes a southbound offramp to West Center Street. The freeway then heads northwest to the 2600 South (SR-93) interchange, which is centered on the border of North Salt Lake and Woods Cross. Continuing north once again, the Interstate reaches its next interchange, which is with 500 South (SR-68). Parts of this interchange are spread over three cities, with Woods Cross on the south, a panhandle of Bountiful in the middle, and West Bountiful on the north. Continuing north, it comes to another partial interchange with 400 North, which only includes a northbound offramp and a southbound onramp. After a slight jog to the east comes the junction with US 89 (500 West). This junction straddles the north–south border between West Bountiful and Bountiful. It is also a partial interchange in that it has only a southbound offramp and a northbound onramp. It also is the beginning of the second 1-15 / US 89 overlap.
Continuing north, it leaves West Bountiful and enters Centerville before reaching the Parish Lane (400 North / SR-105) interchange. About a mile (1.6 km) north, I-15 begins a stretch where the Legacy Parkway (SR-67) parallels the Interstate on the west, with little more than train tracks in between. About another mile (1.6 km) north, the freeway leaves Centerville and enters Farmington. Next comes the partial interchange with 200 West (SR-227), which only includes a northbound offramp and a southbound onramp. Heading north-northeast, it reaches the I-15 / Legacy Highway / US 89 / Park Lane (SR-225) interchange. This sprawling interchange provides a northbound offramp and southbound onramp for US 89, a southbound offramp and a northbound onramp for Legacy Parkway, as well connection with Park Lane. The interchange is just west of the Lagoon amusement park and is the end of the second I-15 / US 89 overlap. From this interchange, it heads northwest before leaving Farmington and entering Kaysville.
Just inside Kaysville are two former rest areas. While the ramps and parking areas are still intact, there are no signage or facilities remaining. Further on is the Kaysville (200 North / SR-273) interchange. Continuing northwest, I-15 leaves Kaysville and enters Layton, along with its three interchanges. The first interchange is with Layton Parkway and just north of it, the express lanes end, leaving just three lanes in each direction. The next two interchanges are with Hill Field Road (SR-232) and then Antelope Drive (2000 North / SR-108). After leaving Layton, the Interstate enters Clearfield and reaches the 700 South (SR-193) interchange. From this interchange, north I-15 runs along the western edge of Hill Air Force Base. The next interchange is with 650 North, which also provides direct access to the west part of the airforce base. Just after this interchange, the freeway leaves Clearfield, turns north, and enters Sunset, but has no further interchanges before leaving that city and Davis County.
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