Interstate 15 in Utah

Interstate 15
Route information
Defined by Utah Code §72-4-107
Maintained by UDOT
Length: 400.592 mi[1] (644.690 km)
Major junctions
South end: I-15 towards Littlefield, AZ
  I-70 near Cove Fort
US-6 in Santaquin
I-80 in Salt Lake City
I-84 in Riverdale
North end: I-15 towards Malad, ID
Highway system

Main route of the Interstate Highway System
Main • Auxiliary • Business

State highways in Utah
Interstate • US • State (Parks) • Scenic

← SR-14 SR-16 →

In the U.S. state of Utah, Interstate 15 runs north–south through the southwestern and central portions of the state, passing through many of the population centers of that 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 via I-15 is the Logan Utah-Idaho Metropolitan Statistical Area.

Contents

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 (5 km) from South Salt Lake to just west of Downtown Salt Lake City and also 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 (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.

I-15 begins at the Arizona/Utah border and heads northeast, continuing with two lanes in each direction. Right past the border, there is a port of entry on each side, making the first exit on the interstate in Utah going northbound. The route turns north past Bloomington before turning northeast again after the interchange with SR-18 to pass the eastern side of St. George. The highway continues northeast after exiting St. George and turns north-northeast north of Toquerville. South of Cedar City, the route turns east and north to pass through the west side of Cedar City and turns northeast again. Past a ranch exit (exit 100), the interstate turns northwest and then north to enter the western side of Beaver, with two interchanges serving that town. The road continues in a general north-northeast direction before intersecting with the western terminus of I-70. Past I-70, the route meanders to the north and northeast before straightening out to the northeast southwest of Kanosh. The highway passes the east side of both Meadow and Fillmore and the west side of Holden. The route turns north briefly after bypassing Scipio to the east before turning northeast. Past the interchange with SR-28 (which serves as a connector to I-70 for southbound I-15 motorists), the road passes the eastern side of Nephi. The interstate then turns northwest and north, bypassing Mona to the east.

The highway enters the Wasatch Front and the Provo-Orem metropolitan area as it turns northeast and enters the town of Santaquin, where US-6 begins its overlap with I-15. Exiting Santaquin, the highway turns north and then northeast again to enter Payson. Continuing northeast, the route enters Spanish Fork and intersects with US-6 on the north side of town, where it turns north and gains one lane in each direction, the first time the interstate widens in the state. This interchange also marks the northern end end of the overlap with US-6. The route passes the west side of Springville and turns northwest south of Provo. The highway enters Provo and intersects with the southern terminus of US-189. Past this point, the interstate widens to four lanes in each direction. The route continues northwest, bisecting the west side of Provo. Past SR-114, the road loses one lane in each direction. Past SR-265, the highway once again widens to four lanes in each direction and gains an HOV lane begins. The lane gain is temporary and when the route turns north, the fourth lane is lost. At this point, the highway exits Provo and enters Orem. Right before the interchange at SR-241, the route turns northwest, entering Lindon. The route then exits Lindon and enters the south side American Fork, meandering between the west-northwest and northwest. The route straightens out the northwest and enters Lehi. In Lehi, US-89 begins an overlap with I-15. Past Lehi, the interstate exits the Provo metropolitan area and Utah County to enter the Salt Lake City metropolitan area.

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. Past SR-140, the highway widens to four lanes in each direction (not including the HOV lane) and turns north. The route enters Draper and turns north-northwest past SR-71, where US-89 ends its overlap with the interstate. As it enters Sandy, the interstate widens to five lanes past SR-151. The route straightens out to the north. The route turns north-northwest past SR-209 and soon after enters Midvale. The route intersects I-215, a beltway running through many of Salt Lake City's suburbs, in Murray. Past this interchange, the route heads north and enters Murray. The route exits Murray and enters South Salt Lake, where an interchange with I-80 and SR-201 is located, colloquially known as the "Spaghetti Bowl". The southern overlap of I-80 begins at this point. Also at this point, the highway enters Salt Lake City and a collector/distributor road begins at either side of the interstate, providing an exit to SR-201, 1300 South, and SR-270. After the collector-distributor ends, the route turns northwest to bypass downtown Salt Lake City. The route turns north after SR-269 and the northern end of the I-80 overlap. Past this point, the HOV lane ends and the highway loses one lane in each direction. Past the single-point urban interchange at SR-268, the interstate turns northwest and loses another lane. Before US-89, the road turns northeast briefly before turning north and entering Davis County.

The road enters North Salt Lake and I-215 defaults onto I-15 northbound. The route then gains two lanes in each direction and turns northeast. Past 2600 South, the highway turns north and enters Woods Cross to the west and Bountiful to the east. In West Bountiful, US-89 begins another overlap with I-15. The highway continues north and enters Centerville. The route exits Centerville and enters Farmington and turns northwest, US-89 exiting on its own separate freeway at an interchange (where the Legacy Parkway terminates). The route passes through Kaysville, Layton, and Clearfield before turning north, passing the west side of Hill Air Force Base. The road continues north through Sunset before turning northeast through Roy. The interstate exits Davis County and enters Weber County. In Roy, I-84 defaults onto I-15 northbound and an overlap begins. The highway enters Ogden and the Ogden-Hinckley Airport is located on the west side of the highway. Past the airport, the route turns northwest before exiting Ogden and entering Marriott-Slaterville, where it straightens out to the north. Past Farr West, the highway turns northwest briefly before turning north and exiting Weber County, the Ogden-Clearfield metropolitan area, and the Wasatch Front.

The interstate continues north through Box Elder County. Brigham City, the county seat, is bypassed to the west by the freeway. Past US-91 (which continues to Logan and points northward), the route turns northwest to Tremonton, where I-84 separates, continuing northwest, and I-15 turns north. The freeway continues in this general direction until the Idaho border. The last exit northbound is located at exit 398, 25800 North, which provides a connection to the town of Portage.[2]

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[3]

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.[3] 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. [4]

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 was raised to 80 mph as a "test," making Utah the second state to currently have speed limits greater than 75 mph.


Exit list

County Location Mile[1] Old exit[5] New exit Destinations Notes
Washington St. George 2.135 2 SR-7 (Southern Parkway)
4.641 4 Brigham Road
6.311 6 SR-18 / I-15 Bus. north (Bluff Street)
8.662 8 I-15 Bus. south (St. George Boulevard, SR-34) to SR-18 – St. George, Santa Clara
Washington 10.901 10 Washington City (SR-212)
13.378 13 Washington Parkway
15.908 16 SR-9 – Hurricane, Zion National Park
Leeds 22.579 22 Leeds, Silver Reef (SR-228) Northbound exit and southbound entrance
23.703 23 Leeds, Silver Reef (SR-228) Southbound exit and northbound entrance
Toquerville 27.470 27 SR-17 – Toquerville, Hurricane
30.682 30 Browse
31.861 31 Pintura
33.435 33 Ranch exit
36.763 36 Ranch exit
40.253 40 Kolob Canyons (Zion National Park)
42.159 42 New Harmony, Kanarraville Former SR-58
Iron 51.149 51 Hamilton Fort, Kanarraville Former SR-58
Cedar City 56.804 57 I-15 Bus. north (SR-130) to SR-14 – Cedar City
58.837 59 SR-56 – Cedar City
62.497 62 SR-130 (I-15 Bus. south) – Cedar City, Enoch, Minersville
70.263 71 Summit, Enoch Former SR-38
Parowan 75.205 75 I-15 Bus. north / SR-143 – Parowan
77.801 78 I-15 Bus. south (SR-274) to SR-143 – Parowan, Paragonah
82.253 82 SR-271 – Paragonah
94.453 95 SR-20 to US-89 – Panguitch, Kanab, Circleville
99.690 100 Ranch exit
Beaver 108.745 109 I-15 Bus. north (SR-160) to SR-21 – Beaver, Milford
Beaver 111.780 112 I-15 Bus. south (SR-160) to SR-21 – Beaver, Milford, Manderfield
120.126 120 Manderfield
125 Ranch exit Closed
129.443 129 Sulphurdale
Millard 132.183 132 I-70 east – Richfield, Denver
134.875 135 Historic Cove Fort (SR-161)
138.073 138 Ranch exit
146.493 146 Kanosh Former SR-133
Meadow 158.265 158 SR-133 – Meadow, Kanosh
Fillmore 163.370 163 I-15 Bus. north (SR-99) – Fillmore
166.723 167 I-15 Bus. south (SR-99) – Fillmore
173.507 174 To US-50 west (via SR-64) – Holden, Delta
178.330 178 US-50 west – Holden, Delta South end of US-50 overlap
183.638 184 Ranch exit
188.439 188 US-50 east – Scipio North end of US-50 overlap
Juab 202.189 202 Yuba Lake
206.553 207 Mills, Levan (SR-78)
Nephi 222.812 222 I-15 Bus. north / SR-28 to I-70 – Nephi, Salina, Richfield
225.266 225 SR-132 – Nephi, Manti
228.091 228 I-15 Bus. south (SR-28) – Nephi, Delta
233.161 236 233 SR-54 – Mona
Utah Santaquin 242.447 245 242 South Santaquin
244.809 248 244 US-6 west – Santaquin, Delta South end of US-6 overlap
Payson 248.845 252 248 Payson, Salem (SR-178)
250.923 254 250 SR-115 – Payson, Benjamin
253.557 256 253 SR-164 – Spanish Fork, Benjamin
Spanish Fork 257.264 260 257 SR-156 – Spanish Fork
257.636 261 258 US-6 east to US-89 – Price, Manti North end of US-6 overlap; northbound exit is via exit 257
Springville 259.976 263 260 SR-77 – Springville
261.821 265 261 SR-75 – Springville, Provo
Provo 263.373 266 263 US-189 north (University Avenue) / 1860 South
265.589 268 265 SR-114 (Center Street) – Provo, Provo Municipal Airport Signed as exits 265A (east) and 265B (west) northbound
Orem 269.072 272 269 SR-265 (University Parkway)
270.660 274 271 Center Street – Orem
271.670 275 272 SR-52 (800 North) to US-189
Lindon 272.767 276 273 1600 North (SR-241) – Lindon
Pleasant Grove 275.328 278 275 Pleasant Grove, Lindon Near the Sam White Bridge
American Fork 276.501 279 276 500 East (SR-180) – American Fork, Pleasant Grove
278.586 281 278 Main Street (SR-145) – American Fork
Lehi 279.701 282 279 SR-73 west (Main Street) – Lehi
282.311 285 282 US-89 south / 1200 West – Lehi South end of US-89 overlap
283.985 287 284 SR-92 – Highland, Alpine
Salt Lake Draper 288.272 291 288 SR-140 (14600 South)
289.832 293 289 SR-154 (Bangerter Highway)
291.358 294 291 SR-71 (12300 South, US-89 north) North end of US-89 overlap
Sandy 292.612 292 SR-175 (11400 South) Opened late 2010
293.634 297 293 SR-151 (10600 South)
295.616 298 295 SR-209 (9000 South)
Midvale 297.920 301 297 SR-48 (7200 South)
Murray 299.005 302 298 I-215 (Belt Route)
300.300 303 300 SR-173 (5300 South)
301.653 304 301 SR-266 (4500 South)
South Salt Lake 303.414 306 303 SR-171 (3300 South)
304.691 307 304 I-80 east – Cheyenne South end of I-80 overlap
305.231 308A 305A SR-201 west – West Valley
305.198 308B 305B 2100 South (SR-201)
Salt Lake City 306.315 309A 305C 1300 South
306.607 309B 305D 900 South (SR-270) Northbound exit and southbound entrance
307.500 310 306 600 South (SR-269) Northbound exit and southbound entrance
307.740 310 307 400 South Northbound exit and southbound entrance are HOV-only
308.079 311 308 I-80 west – Salt Lake International Airport, Reno North end of I-80 overlap
309.333 312 309 600 North (SR-268)
310.239 313 310 1000 North No northbound exit
311.792 314 311 2300 North – Warm Springs Road
311.947 315 312 US-89 south (Beck Street) Southbound exit and northbound entrance
Davis North Salt Lake 313.128 315 312 US-89 north Northbound exit and southbound entrance
313.275 316 313 I-215 south (Belt Route) – Salt Lake Airport Southbound exit and northbound entrance
314.301 317 314 Center Street Southbound exit only
315.243 318 315 2600 South (SR-93)
Woods Cross
316.870 320 316 SR-68 (500 South)
Bountiful
West Bountiful
317.557 321 317 400 North (SR-106) Northbound exit and southbound entrance
318.024 321 317 US-89 south South end of US-89 overlap; southbound exit and northbound entrance
Bountiful
Centerville 319.512 322 319 Centerville (SR-105)
Farmington 322.916 325 322 SR-227 / Lagoon Drive – Farmington Northbound exit and southbound entrance
324.026 326 324 US-89 north to I-84 east – South Ogden North end of US-89 overlap; northbound exit and southbound entrance
324.243 Legacy Parkway Southbound exit and northbound entrance
324.741 327 325 SR-225 / Lagoon Drive – Farmington Northbound exit is via exit 324
Kaysville 328.640 331 328 SR-273 – Kaysville
Layton 330.019 332 330 I-15 Bus. north / SR-126 – Layton Northbound exit and southbound entrance
331.589 334 331 SR-232 (Hill Field Road) – Layton
332.883 335 332 SR-108 (Antelope Drive)– Antelope Island
Clearfield 334.066 336 334 SR-193 (700 South)
335.800 338 335 SR-103 (650 North)
Weber Roy 338.447 341 338 SR-97 (5600 South)
Riverdale 339.133 342 339 SR-26 (Riverdale Road) to I-84 east Northbound exit and southbound entrance
340.227 343 340 I-84 east – Riverdale, Cheyenne South end of I-84 overlap; northbound exit is via exit 339
Ogden 341.948 344 341 SR-79 (31st Street)
343.067 345 342 SR-53 (24th Street) Northbound exit and southbound entrance
West Haven 343.852 346 343 SR-104 (21st Street, Wilson Lane) – Ogden City Center
Marriott-Slaterville 344.968 347 344 SR-39 (12th Street)
346.726 349 346 400 North
Farr West 349.361 352 349 SR-134 (2700 North)
Box Elder 351.853 354 351 SR-126 to US-89 – Willard, Pleasant View
Willard 357.554 360 357 SR-315 – Willard, Perry
358.566 361 Port of Entry
360.542 363 Rest Area Northbound exit and entrance
362.020 364 362 US-91 (1100 South Street, I-15 Bus. north, I-84 Bus. west) to US-89
Brigham City 363.738 366 363 Forest Street
365.508 368 365 SR-13 (900 North Street, I-15 Bus. south, I-84 Bus. east)
Honeyville 372.734 375 372 SR-240 to SR-13 – Honeyville, Bear River
Tremonton 376.532 379 376 SR-13 (I-15 Bus. north, I-84 Bus. west) – Tremonton, Garland, Bear River
379.334 382 379 I-84 west (SR-30 west) – Tremonton, Boise North end of I-84 overlap; south end of SR-30 overlap
Tremonton 381.037 383 381 I-15 Bus. south – Tremonton, Garland
385.266 387 385 SR-30 east – Riverside, Logan North end of SR-30 overlap
392.387 394 392 SR-13 south – Plymouth
398.817 402 398 Portage Former SR-90
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

  1. ^ a b Utah Department of Transportation, Highway Reference Information, accessed May 2008 and December 2009
  2. ^ "Google Maps". Google. http://maps.google.com. 
  3. ^ a b Rand McNally Auto Road Atlas, 1926, accessed via the Broer Map Library
  4. ^ Utah Highways by Dan Stober (personal website, last accessed 08-08-2007)
  5. ^ Utah Department of Transportation, Milepost Project
Major highways in the Salt Lake City area
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