Interstate 15 in Utah partially coincident with U.S. Route 6 in Utah
Northern Utah
Salt Lake area
As the freeway enters Utah County, it also enters Utah Valley, the Wasatch Front, and the Provo–Orem metropolitan area. Turning northeast, it enters the town of Santaquin, where US 6 begins its overlap with I-15 at the interchange with East Main Street / US 6 / SR-198. Exiting Santaquin, the Interstate turns north to pass by the western edge of Spring Lake before entering Payson, turning northeast, and reaching the 800 South (SR-178) interchange. Continuing northeast, the freeway reaches the interchange with North Main Street (SR-115 / 3200 West) in north Payson. Maintaining its course to the northeast, it passes the eastern edge of Benjamin, with an interchange with SR-164 (8000 South), and enters Spanish Fork and gains one lane in each direction. On the north side of Spanish Fork is an interchange with North Main Street (US 6 and SR-156), after which I-15 turns north and gains one more lane in each direction. This interchange also marks the northern end of the overlap with US 6. (The section between Spanish Fork and Lehi was rebuilt in 2010–2012 as part of the I-15 CORE project.)
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