Interstate 15 in Utah

This article is about the section of this freeway in Utah. For the entire length of the freeway, see Interstate 15.

Interstate 15
Route information
Defined by Utah Code §72-4-107
Maintained by UDOT
Length:	400.592 mi (644.690 km)
Major junctions
South end:	I-15 towards Littlefield, Arizona
	I-70 near Cove Fort US-50 near Holden and Scipio US-6 in Santaquin and Spanish Fork US-89 in Lehi, Draper, Bountiful, and Farmington I-215 in Murray and North Salt Lake I-80 in South Salt Lake and Salt Lake City I-84 in Riverdale and Tremonton US-91 in Brigham City
North end:	I-15 towards Malad City, Idaho
Highway system
Interstate Highway System Main Auxiliary Suffixed Business State highways in Utah Interstate • US State (Minor • Parks) Scenic ← SR-14 SR-16 →

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 many of the population centers of the state, including St. George, Provo, Salt Lake City, and Ogden, the latter three being part of the urban area known as the Wasatch Front. It is the primary north–south highway in Utah, as the majority of the state's population lives along its corridor. The only Metropolitan Statistical Area in Utah not connected by I-15 is the Logan Utah-Idaho Metropolitan Statistical Area. The entire length of I-15 within Utah (and south into Arizona) is designated as the Veterans Memorial Highway.

Route description

The interstate passes through the fast-growing Dixie region, which includes St. George, Cedar City, and eventually most of the major cities and suburbs along the Wasatch Front, including Provo, Orem, Sandy, West Jordan, Salt Lake City, Layton, and Ogden. Around Cove Fort, Interstate 70 begins its journey eastward across the country. The interstate merges with I-80 for about 3 miles (4.8 km) from South Salt Lake to just west of Downtown Salt Lake City and merges with Interstate 84 from Ogden to Tremonton. Along nearly its entire length through the state, I-15 winds its way along the western edge of a nearly continuous range of mountains (including the Wasatch Range in the northern half of the state). The only exceptions are when it passes through the mountains south of Cedar City and again north of Cove Fort.

Southern Utah

I-15 near New Harmony, south of Cedar City, looking north

From Las Vegas, Nevada, I-15 winds and slightly inclines through the Virgin River Gorge in northwest Arizona, then in Utah it crosses the border in Washington County. Heading north-northeast it continues with two lanes in each direction and maintaining this two-lane configuration until it reaches the Wasatch Front in the north central part of the state. Just past the border there is a port of entry on each side of the freeway. These ports of entry (weigh stations) are jointly operated by the states of Utah and Arizona and are the first northbound exit and last southbound exit on I-15 in Utah. The route turns north as it passes the Bloomington area of city of St. George and an interchange with Southern Parkway (SR-7) before it crosses the Virgin River. (SR-7 provides access to the new St. George Regional Airport.) Immediately north of the Virgin River, and partially spanning the Santa Clara River, is the new Dixie Drive interchange. After the interchange with Bluff Street (SR-18) I-15 turns northeast again and passes the eastern side of downtown St. George, with an interchange with St. George Boulevard (SR-34). These two interchanges are the southern and northern ends of the St. George I-15 Business Loop. From this point north I-15 generally follows the route of the Old US-91 to the northern border of Utah. (The route of Old US-91, in turn, followed the older Arrowhead Trail highway to Salt Lake City.)

After leaving St. George, I-15 continues northeast and passes through the northern part of the city of Washington, with interchanges at Green Springs Drive, Washington Parkway, and State Street (SR-9). Northeast of Washington I-15 passes through the northwestern side of the town of Leeds, with one-way interchanges on the southwest and northeast ends of town. After passing through the northwestern part of Toquerville, and an interchange with SR-17 (at Anderson Junction), I-15 resumes a more north-northeastern course as it ascends about 1,000 feet (300 m) higher on the Colorado Plateau. Along the way it passes through the areas of Browse and Pintura, with interchanges at both, as well as two more ranch exits further northeast. After its ascent, it passes by the east of side of Ash Creek Reservoir and then by the northwest corner of Zion National Park, with an interchange providing access to the Kolob Canyon area of the park. Next is an interchange that provides access to New Harmony (several miles west) and Kanarraville (several miles to the northeast). This interchange is also at the border of Washington County and Iron County.

Just after entering Iron County, I-15 reaches the southern most rest areas along its route within the state (with one each, northbound and southbound). After passing about a mile west of Kanarraville it reaches an interchange in Hamilton Fort. The freeway then briefly turns nearly east before turning north again to pass through the west side of Cedar City. The first interchange is at the southern end of SR-130 (Main Street) and the Cedar City I-15 Business Loop. Just north is the 200 South (SR-56) interchange, which provides access to downtown Cedar City as well as the Cedar City Regional Airport. After this interchange, the freeway turns northeast before the final Cedar City interchange with SR-130 (once again). This interchange is also the northern end of the Cedar City I-15 Business Loop, although no longer indicated as such by signage. The freeway then passes by the eastern edge of Enoch, but without an interchange within that city. After an interchange within the area of Summit I-15 heads east-northeast before passing by the northwest edge of Parowan, with interchanges on the west (200 South/SR-143) and north (Main Street/SR-274) sides of town. After Parowan, the freeway curves back to a northeast course as it passes about a mile west of Paragonah and reaches an interchange on the north side of that city (SR-271). Continuing northeast it reaches the next pair of rest areas before an interchange with SR-20 and then a ranch exit (exit 100) before leaving Iron County.

Central Utah

An 80 mph speed limit sign in one of the test zones

As I-15 enters Beaver County the interstate turns northwest and winds its way through the mountain pass before heading north again to pass along the western edge of the city of Beaver. Both the southern and northern interchanges in Beaver include the I-15 Business Loop and SR-160—the city streets are South Main Street on the south and 1400 North on the north. Off the 1400 North interchange there is an official rest stop courtesy of the Utah Department of Transportation UDOT and the local Texaco Station. The freeway then heads slightly west until it passes by the west side of the community of Manderfield and curving back to a north-northeast course. After several miles there is an interchange with Manderfield Road before I-15 winds through another mountain pass and reaches the Sulphurdale interchange. After passing west of the ghost town of Sulphurdale it reaches the interchange with the western end of I-70. This interchange is on the border of Beaver and Millard counties.

Extinct volcano cone near Fillmore, Utah off I-15

North of the I-15/I-70 interchange, I-70 heads east to Richfield and on though Denver, Colorado, while I-15 continues north to pass by Cove Fort on the east and reach the Cove Fort (SR-161/Black Rock Road) interchange. Off the Black Rock Road interchange there is an official rest stop courtesy of UDOT and the local Chevron Station. Continuing on, I-15 meanders to the north-northeast before straightening out to the northeast southwest of Kanosh. The freeway passes by the northwest side of both Meadow, having an interchange with North Main Street (SR-133). It then passes through the western side of Fillmore. SR-99 follows the length of the I-15 Business Loop through Fillmore, connecting at 850 South on the southwest part of town and North Main Street/Cedar Mountain Road on the northern city limits. Off the North Main Street interchange there is an official rest stop courtesy of UDOT and the local Chevron Station. Continuing north-northwest it has an interchange with 5400 North/Maple Hollow Road (SR-64) before passing by the southeast edge of Holden. Several miles northeast of Holden, US-50 merges with I-15 as it continues northeast and eventually heading through a low mountain pass just after another ranch exit. The US-50 overlap then ends as I-15 passes through the northwest corner of Scipio. Off the Scipio interchange is an official rest stop courtesy of UDOT and Flying J. (US-50 eastbound serves as a connector to I-70 for southbound I-15 motorists.)

Several miles north of Scipio, I-15 leaves Millard County and enters Juab County before turning northeast once again. After an interchange with the Yuba Lake Road is another interchange at Mills Junction/SR-78 just southeast of Chicken Creek Reservoir. The freeway then continues roughly north-northeast until it turns northeast to pass through the southern part of Nephi and an interchange with South Main Street (SR-28). The freeway then turns north to pass through the eastern side of Nephi, with an interchange with 100 North (SR-132). It then curves to the north-northwest before reach the interchange with the northern end of SR-28 about a mile north of town. The interstate then turns north and passes by the eastern side of Mona and has an interchange with SR-52 (300 North). Continuing north it passes by the eastern edge of Rocky Ridge before promptly leaving Juab County and entering Utah County.

Northern Utah

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 north east, and reaching the 800 South (SR-178) interchange. (Although not yet complete, construction began in late the spring of 2013 to add an additional lane of travel on both sides of I-15 from this interchange north to Spanish Fork.) 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-168 (8000 South), and enters Spanish Fork and gains one lane in each direction (the first time the interstate widens in the state). 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 2010-12 as part of the I-15 CORE project.)

View north along I-15 at the southern junction with I-80 and SR-201 in Salt Lake County

Continuing north with four lanes, it gains an additional Express Lane in both directions. It then passes through the far west side of Springville, with interchanges at 400 South (SR-77) and 1400 North (SR-75). Off the 1400 North interchange is an official rest stop courtesy of UDOT and Flying J. Curving northwest it passes the eastern edge of the Provo Bay of Utah Lake before reaching Provo. Upon entering Provo, it intersects with South University Avenue (the southern terminus of US-189). The interstate then continues northwest, bisecting the west side of Provo, with an interchange with Center Street (SR-114) before leaving Provo and entering Orem. After an interchange with West University Parkway (SR-265), immediately southwest of Utah Valley University, the freeway heads north along the western side of Orem. After interchanges with Center Street, and then 800 North (SR-52) the interstate curves northwest and immediately reaches the interchange with SR-241 (1600 North/600 South). This interchange on the border of Orem and Lindon.

Continuing northwest I-15 passes through the western side of Lindon before passing by the southwest edge of Pleasant Grove, with an interchange at Pleasant Grove Boulevard. Next the freeway enters American Fork with interchanges with at 500 East (SR-180) on the south end of town and West Main Street/Pioneer Crossing (SR-145) on the west end of town. After American Fork, the freeway enters Lehi with it first interchange at East Main Street (SR-73). At this point the interstate narrows to just three lanes (plus an Express Lane) in each direction (however, UDOT anticipates beginning construction on additional lanes in this area in the spring of 2014). The next interchange in Lehi is with 2100 North/1200 West (US-89/SR-85). This also begins the first of two I-15/US-89 overlaps. The final interchange in Lehi with Timpanogos Highway/Clubhouse Drive (SR-92), which is just east of Thanksgiving Point. Past Lehi, the interstate exits the Provo metropolitan area and Utah County to enter the Salt Lake City metropolitan area as it passes through the Point of the Mountain.

I-15 in Salt Lake City

As the route enters the Salt Lake Valley from only one of three other points connecting Salt Lake County and Utah County (the others being SR-68 and Traverse Ridge Road), it turns northeast to pass by the eastern edge of Bluffdale. It then enters Draper and heads north to pass through the western part of that city, with four interchanges along the way. The first is with Highland Drive/14600 South (SR-140). The next interchange is with Bangerter Highway (SR-154), after which the freeway widens to a total of four lanes (plus an Express Lane) in each direction. The third interchange in Draper is with 12300 South (US-89/SR-71). This interchange is also where US-89 ends its first overlap with the interstate and where I-15 curves slightly to the west. The final interchange in town is on the northern city limits at 11400 South (SR-175). This interchange is on the southern border of Sandy, and is the first of three within that city. The next interchange is with 10600 South (SR-151), after which the interstate gains an additional lane in each direction. The final interchange in Sandy is with 9000 South (SR-209).

Shortly after the last interchange in Sandy it leaves that city and enters Midvale, with the only interchange in that city being with 7200 South (SR-48). After leaving Midvale, I-15 enters Murray and immediately reaches the junction with I-215, a beltway running through many of Salt Lake City's suburbs. Past this interchange, there are two more interchanges in Murray. The first is at 5400 South (SR-173) and the second is with 4500 South/Taylorsville Expressway (SR-266). After this interchange the freeway leave Murray and passes through the western end of Millcreek (an unincorporated suburb of Salt Lake City) before entering South Salt Lake. After an interchange with 3300 South (SR-171) the interstate reaches the Spaghetti Bowl, which is an interchange with I-80 and SR-201 (21st South Freeway). The southern overlap of I-80 begins at this point as well as the collector roads. The collectors, but not the main I-15 travel lanes, have interchanges with 2100 South and 1300 South, as well as West Temple Street (SR-270) for northbound traffic only. (The West Temple Street off ramps are signed as 900 South.) The Spaghetti Bowl is also where the freeway leaves South Salt Lake enters Salt Lake City.

After entering Salt Lake City, the interstate jogs to the west for the next three interchanges. The first is with SR-269 and includes the off ramps from northbound I-15/I-80 to eastbound 600 South and the on ramps from westbound 500 South to southbound I-15/I-80. The next two interchanges are overlain and include I-80 (the northern end of the I-80 overlap) and 400 South (West University Boulevard). (The later interchange only permits HOV or toll use of the northbound off ramp and the southbound on ramp from and to the respective Express Lanes of I-15/I-80.) North of the ramps with I-80, I-15 loses one lane, leaving three lanes, plus the Express Lane, in both directions. the next interchange is with 600 North (SR-268), following which the freeway jogs to the west for the next two interchanges. After the 900 West interchange (which does not include a northbound off ramp) is the Warm Springs Road (northbound) and 2300 North (southbound) interchange. The freeway then returns to is northern course, but before leaving Salt Lake City and Salt Lake County, it has northbound on and off ramps for the Beck Street (US-89) interchange.

Northbound along I-15/84 in Ogden

After entering Davis County, the city of North Salt Lake, and the Ogden-Clearfield metropolitan area, I-15 has the southbound on and off ramps for the Beck Street (US-89) interchange. This point is also where the Express Lanes end, leaving just the four lanes in each direction. Next is the junction between I-15 and I-215 (Belt Route), which only provides a southbound off ramp from I-15 to I-215 and a northbound on ramp from I-215 to I-15. Just after this another partial interchange that only includes a southbound off ramp 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 off ramp and a southbound on ramp. 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 off ramp and a northbound on ramp. 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 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 north the freeway leaves Centerville and enters Farmington and then gain and Express Lane once again in both directions. Next comes the partial interchange with 200 West (SR-227), which only includes a northbound off ramp and a southbound on ramp. Heading north-northeast it reaches the I-15/Legacy Highway/US-89/Park Lane (SR-225) interchange. This sprawling interchange provides a northbound off ramp and southbound on ramp for US-89, a southbound off ramp and a northbound on ramp 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 once again, leaving just three lanes in each direction. (However, construction on an additional lane each way began in the summer of 2012.) 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 air force 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.

Just prior to the next interchange I-15 enters Weber County and the city of Roy. After curving slightly to the east the freeway reaches the 5600 South (Utah State Route 97) interchange, which provides access to the north end of the air force base, including the Hill Aerospace Museum that located immediately north of the base. The next interchange is with Riverdale Road (SR-26). As a partial interchange, there is only a northbound off ramp to east bound SR-26 and a southbound on ramp from westbound SR-26. (Eastbound SR-26 provides the only access to eastbound I-84.) At this interchange the interstate also transitions from Roy to Riverdale. Heading northwest, I-15 then merges with I-84, but there is no northbound access to I-84, nor westbound access from I-84 to I-15. This also begins the I-15/I-84 overlap. Immediately northwest of this interchange is the Ogden-Hinckley Airport, however since the airport is on hill slightly above, it is not visible from the freeway. An additional lanes are also added north of this junction for a total of four in each direction. Just after leaving Riverdale, the interstate enters Ogden and reaches the 31st Street (3100 South/SR-79) interchange. Curving back to the northwest, the freeway comes to the 24th South (SR-53) interchange. Although the signage specifies “24th Street”, this partial interchange (which only provides a northbound off ramp and a southbound on ramp) is actually with Pennsylvania Avenue (also SR-53) which promptly connects with 24th Street (2400 South) northeast of the interchange.

As it leaves Ogden and enters West Haven, I-15 curves to the north-northwest before coming to the 21st Street (2100 South/SR-104) interchange. The freeway then leaves West Haven and enters Marriott-Slaterville and immediately crosses the Weber River. The next interchange is with 12th Street (1200 South/SR-39, at which point the freeway losses one lane in each direction. Continuing on with three lanes in each direction the interstate reaches the 400 North interchange. Similar to the 24th Street interchange, although signage indicates “400 North”, this interchanges actually connects with Pioneer Road, which promptly connects with 400 North just east of the interchange. North of this interchange, I-15 heads directly north to leave Marriott-Slaterville and enter Farr West. Continuing north it reaches the 2700 North (SR-134) before it curves to the north-northwest and leaves Farr West and Weber County. At the 2700 North interchange, the freeway also reduces to two lanes of travel in each direction and remains so for the remainder of its route in Utah.

I-15 warning sign for potentially drowsy drivers

Upon entering the final county (Box Elder) along its route in Utah, I-15 also enters the area of South Willard and then reaches the Willard (2000 West/SR-126) interchange. (SR-126 connects with US-89 just west of the interchange.) Before leaving the South Willard area and entering the city of Willard, I-15 begins about a two-mile stretch that runs along the western shore of the Willard Bay of the Great Salt Lake. Its next interchange is with 750 North SR-315. Straddling the northern border between Willard and Perry ports of entry for both directions of traffic. Continuing north through Perry it passes a rest area for northbound traffic before it reaches the next interchange, which is with 1100 South (US-91). This interchange straddles the northern border of Perry and the southern border of Brigham City. (US-91 continues northeast to Logan and points northward.) Curving slight to the west, the interstate reaches the Forrest Street interchange followed by the 900 North (SR-13) interchange. Immediately north of 900 North the freeway passes immediately to the west of the Brigham City Airport. West of the airport there is also a rest area for southbound traffic. At the north end of the airport, the freeway leaves Brigham City and before continuing on a slight more westerly, northern course.

After about a mile in unincorporated Box Elder County, I-15 enters Honeyville and then reaches the Honeyville/Bear River (6900 North/SR-240) interchange. Continuing northwest the interstate leaves Honeyville and immediately crosses the Bear River. It then enters the town of Elwood and reaches the Tremonton/Garland (5200 West/SR-13) interchange. The freeway then leaves Elwood and enters Tremonton shortly thereafter. Just inside Tremonton, is the I-15/I-84/SR-30 junction. From this junction, I-84 and SR-30 head northwest to Snowville and on to Burley and Boise, Idaho, while I-15 continues north through Tremonton. This interchange is also the northern end of the I-15/I-84 overlap and the southern end of the I-15/SR-30 overlap. Straddling the northern city limits of Tremonton is another interchange signed as “Tremonton/Garland”. This second interchange of the same name is with 1000 North. Curving slightly to the east, it passes by the western edge of Garland before coming to the Riverside (15200 North/SR-30) interchange, which is just southwest of that city and is the northern end of the I-15/SR-30 overlap. Continuing a slightly winding course north, the interstate reaches the Plymouth (20800 North/SR-13) interchange, which is just northwest of that town. Heading north, and then to the north east the freeway reaches the Portage (25800 North/Center Street), which is the last interchange in the state and is just east of that town. About a mile north of the last interchange is the Utah-Idaho border, where I-15 leaves the Ogden-Clearfield metropolitan area. From there I-15 continues north to Malad City and on to Pocatello.

History

See also: U.S. Route 91

The southwest-north alignment followed by I-15 was a major transportation corridor in the early 20th century, followed by auto trails such as the Arrowhead Trail (south from Salt Lake City), Evergreen National Highway (entire length), and Banff-Grand Canyon Road (north from Nephi). In 1926, when the numbered system of U.S. highways was created, this route was signed U.S. Route 91

The route of I-15 from St. George to Brigham City was built along the corridor of what was U.S. Route 91 from 1926-1974. In 1974 I-15 was reasonably intact and US-91 was deleted, with the unfinished segments signed as Temporary I-15. The route north of Brigham City was built along the corridor of an old route of U.S. Route 191. This highway was also deleted once I-15 was reasonably intact. However, a different route in Utah was re-designated US-191 in 1982. Also, by the time it completed the section, UDOT recalibrated the mileposts and renumbered the exits, reducing the overall distance by approximately three miles.

Prior to 1977 the route of I-15 (and US-91 before) was also designated State Route 1 by the state of Utah, but no portion of the route was signed with this number.

In January 2009, the speed limit on two sections of I-15 together totaling 34 miles (55 km) was raised to 80 miles per hour (130 km/h) as a "test," making Utah the second state to currently have speed limits greater than 75 miles per hour (121 km/h). In September 2013, with a few brief exceptions, the speed limit north of Leeds (other than the Wasatch Front, between Santaquin and Brigham City) was raised to 80 miles per hour (130 km/h).

The UDOT Utah County I-15 Corridor Expansion was a design-build project that reconstructed 24 miles (39 km) of I-15 in Utah County, Utah. The $1.725 billion project was the fastest billion-dollar public highway project ever completed in the United States. The project was completed on December 15, 2012—35 months from the original notice to proceed—and finished $260 million under budget (coming in at $1.465 billion total). I-15 CORE widened the freeway by two lanes in each direction and replaced the original asphalt with new 40-year concrete pavement; rebuilt 63 bridges; reconstructed 10 freeway interchanges; and extended the Express Lane (high occupancy/toll) from Orem to Spanish Fork. (Prior to I-15 CORE, Express Lane had already been installed from Lehi to Orem.)

Exit list

County	Location	mi	km	Old exit	New exit	Destinations	Notes
Washington	​	0.000	0.000	Arizona–Utah state line I-15 south continues into Arizona
	St. George	0.462	0.744	1		Ports of Entry
		2.135	3.436	2	2	SR-7 east (Southern Parkway)
		4.641	7.469	4	4	Brigham Road
		5.619	9.043		5	Dixie Drive
		6.309	10.153	6	6	I-15 Bus. north / SR-18 north (Bluff Street)
		8.652	13.924	8	8	I-15 Bus. south / SR-34 west (St. George Boulevard)
	Washington	10.910	17.558	10	10	SR-212 east (Green Springs Drive)
		13.386	21.543	13	13	Washington Parkway
	Washington–Hurricane line	15.888	25.569	16	16	SR-9 east (State Street)
	Leeds	22.579	36.337	22	22	SR-228 north (Main Street)	Northbound exit and southbound entrance
		23.703	38.146	23	23	SR-228 (Silver Reef Road)	Southbound exit and northbound entrance
	Toquerville	27.470	44.209	27	27	SR-17 south – Toquerville, Hurricane
	​	30.682	49.378	30	30	Browse
	​	31.861	51.275	31	31	Pintura
	​	33.435	53.808	33	33	Snowfield
	​	36.763	59.164	36	36	Black Ridge
	​	40.253	64.781	40	40	Kolob Canyons
	​	42.159	67.848	42	42	New Harmony, Kanarraville	Former SR-58 (north-northwest) & former SR-144 (west)
Iron	​	44.132	71.024			Rest Areas	Northbound and southbound rest areas
	​	51.149	82.316	51	51	Hamilton Fort, Kanarraville	Former SR-58 (south)
	Cedar City	56.787	91.390	57	57	I-15 Bus. north / SR-130 (South Main Street) to SR-14 east
		58.837	94.689	59	59	SR-56 (200 North)
		62.497	100.579	62	62	I-15 Bus. south (North Main Street) / SR-130 to SR-14 east
	​	70.263	113.077	71	71	Summit, Enoch	Former SR-38
	Parowan	75.183	120.995	75	75	I-15 Bus. north / SR-143
		77.801	125.209	78	78	I-15 Bus. south to SR-143 (Main Street) – Paragonah (SR 274)
	​	82.253	132.373	82	82	SR-271 south (Main Street) – Paragonah
	​	87.418	140.686			Rest Areas	Northbound and southbound rest areas
	​	94.453	152.007	95	95	SR-20 to US-89 – Panguitch, Circleville, Kanab
	​	99.690	160.436	100	100	Ranch exit (Fremont Road)
Beaver	Beaver	108.745	175.008	109	109	I-15 Bus. north to SR-21 – Beaver, Milford
		111.780	179.892	112	112	I-15 Bus. to SR-21 – Manderfield, Milford
	​	120.126	193.324	120	120	Manderfield
	​			125	125	Ranch exit	Exit closed and removed
	​	129.438	208.310	129	129	Sulphurdale
Millard	​	132.170	212.707	132	132	I-70 east – Richfield, Denver	Western end of I-70
	​	134.875	217.060	135	135	SR-161 south (Historic Cove Fort)
	​	138.073	222.207	138	138	Ranch exit
	​	146.493	235.758	146	146	Kanosh	Former SR-133
	Meadow	158.265	254.703	158	158	SR-133 south – Kanosh
	Fillmore	163.370	262.919	163	163	I-15 Bus. north – Fillmore, (SR 99)
		166.723	268.315	167	167	I-15 Bus. south, (SR 99)
	​	173.507	279.232	174	174	To US-50 – Delta, Holden, (SR 64)
	​	178.330	286.994	178	178	US-50 west – Delta, Holden	South end of US-50 overlap
	​	183.638	295.537	184	184	Ranch exit
	Scipio	188.439	303.263	188	188	US-50 east – Scipio	North end of US-50 overlap
Juab	​	202.189	325.392	202	202	Yuba State Park
	​	206.553	332.415	207	207	Mills, Levan ( SR-78
	Nephi	222.812	358.581	222	222	I-15 Bus. north (South Main Street) / SR-28
		225.248	362.502	225	225	SR-132 (100 North)
	​	228.065	367.035	228	228	I-15 Bus. south / SR-28 – Nephi
	​	233.161	375.236	233	233	SR-54 – Mona
Utah	Santaquin	242.447	390.181	245	242	South Santaquin
		244.788	393.948	248	244	US-6 west (East Main Street)	South end of US-6 overlap
	Payson	248.829	400.451	252	248	Salem, (SR 178)
		250.923	403.821	254	250	SR-115 (North Main Street) – Benjamin
	​	253.557	408.060	256	253	SR-164 (8000 South) – Spanish Fork, Benjamin
	Spanish Fork	257.246	413.997	260	257A	SR-156 south (North Main Street)
		257.666	414.673		257B	US-6 east – Price	North end of US-6 overlap
		257.636	414.625	261	258	US-6 east	Exit reconfigured as Exit 257B
	Springville	259.963	418.370	263	260	SR-77 (400 South)
		261.781	421.296	265	261	SR-75 east (1400 North)
	Provo	263.358	423.834	266	263	US-189 north (University Avenue)
		265.364	427.062	268	265	SR-114 (Center Street)
	Orem	269.072	433.029	272	269	SR-265 (University Parkway)
		270.660	435.585	274	271	Center Street
		271.670	437.210	275	272	SR-52 (800 North) to US-189
	Orem–Lindon line	272.767	438.976	276	273	SR-241 (1600 North)
	Pleasant Grove	275.279	443.019	278	275	Pleasant Grove Boulevard
	American Fork	276.436	444.881	279	276	SR-180 north (500 East)
		278.493	448.191	281	278	SR-145 (Main Street)
	Lehi	279.701	450.135	282	279	SR-73 (Main Street)
		282.311	454.336	285	282	US-89 south (2100 North) / SR-85 west	South end of US-89 overlap; US-89 signed southbound
		283.985	457.030	287	284	SR-92 (Timpanogos Highway) – Highland, Alpine
Salt Lake	Draper	288.272	463.929	291	288	SR-140 west (14600 South)
		289.832	466.439	293	289	SR-154 (Bangerter Highway)
		291.358	468.895	294	291	SR-71 (12300 South)	North end of US-89 overlap
						US-89 north (State Street) – Sandy	Former north end of US-89 overlap
	Draper–Sandy– South Jordan tripoint	292.612	470.913		292	SR-175 (11400 South)	Opened late 2010
	Sandy–South Jordan line	293.634	472.558	297	293	SR-151 (10600 South)
		295.616	475.748	298	295	SR-209 (9000 South)
	Midvale	297.920	479.456	301	297	SR-48 (7200 South)
	Murray	299.005	481.202	302	298	I-215 (Belt Route)	I-215 exit 12.
		300.300	483.286	303	300	SR-173 (5300 South)
		301.653	485.463	304	301	SR-266 (4500 South)
	South Salt Lake	303.414	488.298	306	303	SR-171 (3300 South)
		304.691	490.353	307	304	I-80 east – Cheyenne	South end of I-80 overlap, west exit 123B; part of the "Spaghetti Bowl" interchange.
		305.231	491.222	308A	305A	SR-201 west (21st South Freeway) / 900 West – West Valley	I-80 west exit 123A; part of the "Spaghetti Bowl" interchange.
		305.198	491.169	308B	305B	2100 South (SR 201 east)
	Salt Lake City	306.315	492.966	309A	305C	1300 South
		306.607	493.436	309B	305D	900 South (SR 270)	Northbound exit and southbound entrance
		307.500	494.873	310	306	600 South (SR 269)	Northbound exit and southbound entrance
		307.740	495.260	310	307	400 South	Northbound exit and southbound entrance are HOV-only
		308.079	495.805	311	308	I-80 west – Salt Lake City International Airport, Reno	North end of I-80 overlap, east exit 120.
		309.333	497.823	312	309	SR-268 east (600 North)
		310.239	499.281	313	310	1000 North	No northbound exit
		311.792	501.781	314	311	2300 North
		311.947	502.030	315	312	US-89 north (Beck Street)	Northbound exit and entrance
Davis	North Salt Lake	313.128	503.931	315	312	US-89 south (Beck Street)	Southbound exit
		313.275	504.167	316	313	I-215 west (Belt Route) – Salt Lake City International Airport	Southbound exit and northbound entrance
		314.301	505.818	317	314	Center Street	Southbound exit only
	North Salt Lake–Woods Cross line	315.243	507.334	318	315	2600 South (SR 93)
	Woods Cross–Bountiful– West Bountiful tripoint	316.870	509.953	320	316	SR-68 (500 South)
	West Bountiful	317.557	511.058	321	317	400 North (SR 106)	Northbound exit and southbound entrance
	West Bountiful–Bountiful line	318.024	511.810	321	317	US-89 south (500 West)	South end of US-89 overlap; southbound left exit and northbound entrance
	Centerville	319.512	514.205	322	319	SR-105 (Parrish Lane)
	Farmington	322.916	519.683	325	322	SR-227 north (200 West)	Northbound exit and southbound entrance
		324.026	521.469	326	324	US-89 north to I-84 east – South Ogden	North end of US-89 overlap; northbound exit and southbound entrance
		324.243	521.819		324	Legacy Parkway	Southbound exit and northbound entrance
		324.741	522.620	327	325	SR-225 (Park Lane)	Northbound exit is via Exit 324
	Kaysville	328.640	528.895	331	328	SR-273 (200 North)
	Layton			332	330	I-15 Bus. (Main Street) / SR-126 north	Northbound exit and southbound entrance Exit closed upon completion of Layton Parkway interchange (same exit number, but further north) Business loop eliminated upon move
		330.019	531.114	332	330	SR-126 north (Layton Parkway)
		331.589	533.641	334	331	SR-232 (Hill Field Road)
		332.883	535.723	335	332	SR-108 (Antelope Drive)
	Clearfield	334.066	537.627	336	334	SR-193 (700 South)
		335.800	540.418	338	335	SR-103 (650 North)
Weber	Roy	338.447	544.678	341	338	SR-97 (5600 South)
	Riverdale	339.133	545.782	342	339	SR-26 (Riverdale Road) to I-84 east	Northbound exit and southbound entrance, both to eastbound SR-26 only
		340.227	547.542	343	340	I-84 east – Cheyenne	South end of I-84 overlap; northbound access to I-84 is via Exit 339
	Ogden	341.948	550.312	344	341	SR-79 (31st Street)
		343.067	552.113	345	342	SR-53 (24th Street)	Northbound exit and southbound entrance
	West Haven	343.852	553.376	346	343	SR-104 (21st Street)
	Marriott-Slaterville	344.968	555.172	347	344	SR-39 (12th Street)
		346.726	558.001	349	346	400 North
	Farr West	349.361	562.242	352	349	SR-134 (2700 North)
Box Elder	​	351.853	566.253	354	351	SR-126 (2000 West) to US-89 – Willard, Pleasant View
	Willard	357.554	575.427	360	357	SR-315 (750 North)
		358.566	577.056	361		Ports of Entry
	Perry	360.542	580.236	363		Rest Area	Northbound rest area only
	Brigham City	362.020	582.615	364	362	US-91 (1100 South) to US-89
		363.738	585.380	366	363	Forest Street
		365.508	588.228	368	365	SR-13 (900 North Street)
	​	366.558	589.918			Rest Area	Southbound rest area only
	Honeyville	372.734	599.857	375	372	SR-240 to SR-13 – Honeyville, Bear River
	Tremonton	376.532	605.970	379	376	I-15 Bus. / SR-13 – Garland, Bear River
		379.334	610.479	382	379	I-84 west – Boise	North end of I-84 overlap
		381.037	613.220	383	381	I-15 Bus. south – Garland
	​	385.266	620.026	387	385	SR-30 east – Riverside, Logan
	​	392.387	631.486	394	392	SR-13 south – Plymouth
	​	398.817	641.834	402	398	Portage	Former SR-90
	​	400.592	644.690	Idaho–Utah state line I-15 north continues into Idaho
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Closed/former       Concurrency terminus       Incomplete access

External links

• Media related to at Wikimedia Commons

Interstate 15
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