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Interstate 15 in California

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Subject: List of state highways in California, Interstate 8, Interstate 15, Interstate 40 in California, Spaghetti Bowl (Salt Lake City)
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Interstate 15 in California

Interstate 15 markerState Route 15 marker

Interstate 15 and State Route 15
Route information
Defined by Streets and Highways Code § 315
Maintained by Caltrans
Length: 293.64 mi[1][1] (472.57 km)
Existed: 1957 – present
  • SR 15 from Harbor Drive to I-8 junction
  • I‑15 north of I-8 junction to Nevada state line
Major junctions
South end: I‑5 in San Diego
  I‑805 in San Diego
I‑8 in San Diego
I‑215 in Murrieta
I‑10 in Ontario
SR 210 in Rancho Cucamonga
I‑215 in San Bernardino
SR 58 in Barstow
I‑40 in Barstow
North end: I‑15 at Nevada state line
Highway system
SR 14 SR 16

Route 15, consisting of the contiguous segments of State Route 15 (SR 15) joined by Interstate 15 (I-15), is a major north–south state highway in the U.S. state of California, connecting San Bernardino, Riverside, and San Diego Counties. The route consists of the southernmost 287.26 miles (462.30 km)[2] of I-15, a major Interstate Highway that extends north through Nevada, Arizona, Utah, Idaho, and Montana to the Canadian border. It is a major thoroughfare for traffic between San Diego and the Inland Empire, as well as between Southern California, Las Vegas, Nevada, and points beyond.

South of its junction at Interstate 8 in San Diego, the highway becomes SR 15, extending 5.59 miles (9.00 km)[1] to Interstate 5, about 12 miles (19 km) from the Mexican border. This segment was initially signed as a state route instead of an Interstate, but it is being upgraded to Interstate standards so it would become part of I-15 in the future. Including this segment, the entire length of Route 15 is 293.64 miles (472.57 km).[1]

Interstate 15 has portions designated as the Escondido Freeway, Avocado Highway, Temecula Valley Freeway, Ontario Freeway, Barstow Freeway, CHP Officer Larry L. Wetterling and San Bernardino County Sheriff's Lieutenant Alfred E. Stewart Memorial Highway, or Mojave Freeway.

Route description

Looking south from the University Avenue overpass

SR 15 is part of the [5] The route interchanges with Interstate 805; however, one can only continue in the same direction that they were going at this interchange, since this is the interchange of two north–south freeways, resulting in the overall shape of an "X." Between the Polk Avenue and Orange Avenue overpasses, the freeway goes under a city park that was built on top of the freeway during construction in 2001. Pedestrian bridges were also built at Monroe Avenue and Landis Street to reduce the effects of the freeway geographically dividing the community.[6] Between I-8 and I-805, SR 15 follows the former alignment of 40th Street, which was its former routing as a city street.[4] It continues seamlessly into the southern terminus of I-15 at I-8 in San Diego. On the northbound conversion to I-15 at I-8, there is no "End SR 15" sign.[7]

Interstate 15 is part of the California Freeway and Expressway System,[3] and it is eligible for designation as a state highway within the State Scenic Highway System;[8] however the state transportation authority, Caltrans, has not done so.[9] There are various local names for the highway, such as the Escondido Freeway between San Diego and Escondido. I-15 between SR 163 and Pomerado Road/Miramar Road is known as the Semper Fi Highway in recognition of the nearby Marine Corps Air Station Miramar.[10] North of the Escondido city limits it is known as the Avocado Highway, whose designation ends upon entering Temecula. There are other local names as noted below.

Heading northward, I-15 currently begins at Interstate 8, at the same place that its continuation, State Route 15, begins its southward journey. I-15 goes through Mission Valley and intersects with State Route 52, before merging with State Route 163. After traversing the Marine Corps Air Station Miramar, I-15 comes into Rancho Peñasquitos, where it intersects with the end of State Route 56. Northward, the route crosses Lake Hodges inside the upper San Diego city limits. I-15 continues north into Escondido, where it interchanges with State Route 78.

Cat Dune sand ramp, Cronese Mountains, southwest of Baker, California.

North of Escondido, I-15 goes through hilly terrain and farmland, descending to the town of Fallbrook and intersecting State Route 76 (SR 76), before it crosses the county line into Riverside County and descends to the Inland Empire. In Riverside County, SR 79 joins I-15 and runs concurrently with the route for a 3.2-mile (5 km) portion in Temecula, before it splits away running north to Hemet. Then, I-15 intersects with the southern end of Interstate 215, which continues the designation of the Escondido Freeway. Interstate 15 continues north as the Temecula Valley Freeway.[11]

West of Baker, the freeway jogs north to pass Cave Mountain.

In Murrieta, I-15 splits from its first and only spur route in California, Interstate 215, which runs through the two largest cities in the Inland Empire, San Bernardino and Riverside. I-15 runs along the eastern edge of the Santa Ana Mountains, passing the city of Lake Elsinore. It continues through the suburban areas in the western Inland Empire, passing Corona and Ontario, California. The highway is then rejoined by I-215, before heading northwards and upward through the Cajon Pass, an important mountain pass that is the primary route between Southern California and points eastwards and northeastwards.

Intersection of I-10 and I-15.

The portion of I-15 that is located between its northern and southern junctions with I-215 is also used by many local residents as the major north–south route for the western portions of the San Bernardino-Riverside-Ontario metropolitan area. (I-215 serves a similar function in the eastern portion of the metropolitan area. These two highways are the only continuous north–south freeways in the area.)

North of Limonite Avenue (south of SR 60), I-15 is known as the Ontario Freeway. I-15 intersects State Route 60, Interstate 10, and State Route 210 in rapid succession as it proceeds through Mira Loma, Ontario, and Rancho Cucamonga. As it approaches Devore, I-15 merges with Interstate 215, where it is called the Barstow Freeway or the Mojave Freeway. A short section between SR 138 and Oak Hill Road is also designated as the CHP Officer Larry L. Wetterling and San Bernardino County Sheriff’s Lieutenant Alfred E. Stewart Memorial Highway, named after two officers killed in the line of duty.[12]

Exit to Zzyzx.

North of the Cajon Pass, I-15 traverses the Mojave Desert towns of Hesperia and Victorville. I-15 passes through desert for 30 miles (48 km) before reaching Barstow, then continues past Zzyzx Road, before reaching the town of Baker. The sign for Zzyzx Road — alphabetically the last place name in the world — is a landmark of sorts on the drive between Los Angeles and Las Vegas. I-15 enters Nevada near the casino town of Primm, formerly known as Stateline, Nevada.

Southbound I-15 inspection station
Westbound coming down into Shadow Valley. Halloran Summit is on the skyline, about 8 miles (13 km) away.

I-15 continues thereafter to Las Vegas, Salt Lake City, and on into Idaho and Montana, before ending at the Canadian border, where Alberta Highway 4 continues the ribbon of asphalt into Canada. Because it joins with the western end of I-70 in Southwestern Utah, I-15 also forms part of a major east–west corridor connecting Southern California with Denver, St. Louis, and points east.

The Mojave Freeway is fairly busy on weekdays, since it connects the rapidly growing exurbs of the Victor Valley with the Los Angeles area. On weekends and holidays, however, it can sometimes be jammed with Californians driving to Las Vegas for short vacations.[2]

Construction is currently underway to rehabilitate the pavement on I-15 and to add truck lanes to separate autos from truck traffic.

Express lanes

There are high-occupancy toll lanes in the center of I-15 from State Route 163 to State Route 78; solo drivers are required to pay a toll using a FasTrak transponder.[13]


I-15 replaced US 395 between San Diego and Temecula. The highway replaced US 66 between San Bernardino and Barstow. The route north of Barstow replaced US 91.

I-15 was initially planned to run from I-10 in San Bernardino along the current I-215 alignment then up through the Cajon Pass and on to Las Vegas, with a distance of 186.24 miles (299.72 km) within the state. California successfully argued the addition south to San Diego, suggesting that the freeway would connect the major military bases, the former March AFB (now March ARB) and the former NAS Miramar (now MCAS Miramar). US 395 was then signed TEMP-15 and the "old" I-15 between Devore and San Bernardino became I-215.

On January 24, 1957, the State Highway Commission defined the Escondido Freeway as what are now Routes 15 and 215 from Route 805 to Route 91. This entire segment was previously U.S. Route-395 when it was named. Since then, the definition was extended on Route 15 south to Route 8 by Assembly Concurrent Resolution 34, Chapter 67 in 1979.[14] Meanwhile, the segment of Route 15 from the San Diego County Line to the I-15/I-215 interchange was named the Temecula Valley Freeway in 1990.[15]

The original definition for the Corona Freeway, as named by the State Highway Commission on July 23, 1958, stated that it was "Routes 71, 91, and 15 from Route 10 West of Pomona to Route 215".[16]

This legal definition has been amended twice: First in 1990, the California Assembly passed Concurrent Resolution 125, Chapter 78, renaming I-15 between the San Diego County Line (which is further south from Interstate 215) and Bundy Canyon Road near Lake Elsinore as the Temecula Valley Freeway.[15]

Then in 1993, the California Assembly passed legislation officially designating State Route 71 as a part of the Chino Valley Freeway.[17] However, the name "Corona Freeway" is, confusingly, sometimes still applied to this portion of State Route 71; thus, despite the official change, guide signs on I-10 eastbound and SR 57 southbound at the Kellogg Interchange in Pomona still refer to SR 71 as the "Corona Freeway".

Present SR 15 was signed after the creation of I-15 in 1968. Since I-15's terminus was at I-8, SR 15 was signed mostly along 40th Street and Wabash Boulevard in San Diego to its merge with I-5. The portion between Adams Avenue and Interstate 805 remained a city street for a long time, and this portion was not completed until January 2000. For this reason, the freeway is often referred to as the 40th Street Freeway.[10]

Before the completion of the freeway, from 1968 to 1992, the neighborhood was known for prostitution, drugs, drive-by shootings, and gangs. The indirect cause of all this was due to Caltrans' plans to build a freeway in this area on land where houses were. Because families did not want to live in these houses since they would be soon torn down, they rented them to those who were only going to be in the area on a temporary basis; many of these people were involved in illegal activities. Even though the freeway was officially added to the Caltrans proposals as early as 1968, it was not until March 1992 that construction began. Many in the city opposed the building of this freeway, although some petitioned for the freeway to be built because of the poor conditions in the neighborhood.[18]

State Route 31

In 1933, Interstate 15 was defined as Legislative Route 193, running from pre-1964 Legislative Route 43 (present State Route 91) in Corona to pre-1964 Legislative Route 9 (now State Route 66, and was extended north to pre-1964 Legislative Route 31 (present I-15 and I-215) in 1935.[19] The piece south of U.S. Route 60 (Mission Boulevard), running along North Main Street, Hamner Avenue and Milliken Avenue, was state-maintained by 1955, but was not assigned a signed number.[20] This was still the only existing piece in 1963, and had a planned freeway replacement to the east.[21]

In the 1964 renumbering, the route was assigned as State Route 31. It was added to the Interstate Highway System in February 1972 as a realignment of Interstate 15 (the former alignment became Interstate 15E).[22] Legislative changes were made in 1974, eliminating SR 31 (along with State Route 71 south of Corona) in favor of I-15.[23] However, SR 31 continued to be signed — as temporary Interstate 15 - until present I-15 was finished. (A 1986 map shows state maintenance continuing north past SR 60 to Jurupa Street, where it turned east to I-15.[24])


The segment signed as California State Route 15 from Interstate 5 to Interstate 8 in San Diego will be re-designated as part of I-15 once this segment is completely upgraded to Interstate standards.

Most of Interstate 15 is undergoing major improvements from Devore to the Nevada State Line, beginning in 2002 and costing $349 million. This project will improve traffic flow on the heavily traveled highway for those going to and from Las Vegas. Most of the construction was completed by winter 2009.[25] Projects include adding 39 miles (63 km) of truck lanes on hills at various locations, repaving 76 miles (122 km) of I-15 at various locations, adding exit numbers, renovating and rehabilitating the rest area between Baker and the Nevada State Line (Valley Wells Rest Area), reconstructing bridges in Baker, and moving the agriculture inspection station from Yermo to the Nevada State Line and including a truck weigh station.

As of March 2008, construction is underway to add a northbound truck descending lane and to repave lanes between Bailey Road and Yates Well Road.

Redesignation of SR-15 as I-15 will eventually occur when the freeway's [5]

Exit list

|- |}

See also


  1. ^ Millage is the entire route, including both SR 15 and I-15
  2. ^ The highway was featured on the television program Dangerous Drives (Speed), which illustrated the difficulties of patrolling the highway due to excessive speed and congestion. The 45-minute episode "Dangerous Drives: Highway Patrol" originally aired in January 2010.



  1. ^ a b c
  2. ^
  3. ^ a b
  4. ^ a b
  5. ^ a b
  6. ^ Caltrans District 11 Fact Sheet for SR-15 Project
  7. ^
  8. ^
  9. ^
  10. ^ a b
  11. ^
  12. ^
  13. ^
  14. ^ Caltrans 2009, p. 60
  15. ^ a b Caltrans 2009, p. 63
  16. ^ Caltrans 2009, p. 69
  17. ^ Caltrans 2009, p. 67
  18. ^
  19. ^
  20. ^
  21. ^
  22. ^
  23. ^
  24. ^
  25. ^
  26. ^

Works cited

External links

San Diego San Diego 0.00 0.00 Harbor Drive Southbound exit and northbound entrance; south end of SR 15
1A Main Street Southbound exit and northbound entrance
1 I‑5 (Montgomery Freeway) – National City, Chula Vista Southbound exit and northbound entrance; signed as exits 1B (north) and 1C (south); I-5 exit 13A
0.60 0.97 1D Ocean View Boulevard, Imperial Avenue Signed as exit 1 northbound
1.85 2.98 2A Market Street
2.23 3.59 2 SR 94 (M. L. King Jr. Freeway) / Home Avenue Signed as exits 2B (east) and 2C (west) northbound; southbound exit to SR 94 east is via exit 3; SR 94 east exits 2A and 2C, west exit 2
3.37 5.42 3 I‑805 north (Jacob Dekema Freeway) – Los Angeles Northbound exit and southbound entrance; I-805 south exit 14
I‑805 south (Jacob Dekema Freeway) to SR 94 east Southbound exit and northbound entrance; I-805 north exit 14
4.66 7.50 5A University Avenue – City Heights Transit Plaza
5.07 8.16 5B El Cajon Boulevard – Boulevard Transit Plaza Former I-8 Bus.
5.64 9.08 6A Adams Avenue
6.13 9.87 6B I‑8 / Camino del Rio South – Beaches, El Centro North end of SR 15; south end of I-15; I-8 exits 7A-B
6.82 10.98 7 Friars Road – Qualcomm Stadium Signed as exits 7A (east) and 7B (west) northbound
8.37 13.47 8 Aero Drive
9.24 14.87 9 Balboa Avenue, Tierrasanta Boulevard Former SR 274 west
10.00 16.09 10 Clairemont Mesa Boulevard Southbound exit is part of exit 11
10.58 17.03 11 SR 52 SR 52 exit 7
  I-15 Express Lanes South end of Express Lanes
  SR 163 south Southbound exit and northbound entrance for Express Lanes only
12.12 19.51 12 SR 163 south (Cabrillo Freeway) Southbound exit and northbound entrance; former US 395 south
13.33 21.45 13 Miramar Way Serves Marine Corps Air Station Miramar
14.29 23.00 14 Miramar Road, Pomerado Road
15.00 24.14 15 Carroll Canyon Road
  Hillery Drive – Mira Mesa Express Lanes access only
15.92 25.62 16 Mira Mesa Boulevard
17.31 27.86 17 Mercy Road, Scripps Poway Parkway
18.18 29.26 18 Poway Road (CR S4), Rancho Peñasquitos Boulevard
  SR 56 west / Ted Williams Parkway Northbound exit and southbound entrance for Express Lanes only
  Sabre Springs-Peñasquitos Transit Station Express Lanes access only
19.47 31.33 19 SR 56 west (Ted Williams Freeway) / Ted Williams Parkway SR 56 exit 9
20.57 33.10 21 Carmel Mountain Road
21.92 35.28 22 Camino del Norte
22.94 36.92 23 Bernardo Center Drive
  George Cooke Express Drive – Rancho Bernardo Express Lanes access only
23.69 38.13 24 Rancho Bernardo Road
26.03 41.89 26 Pomerado Road (CR S5), West Bernardo Drive
Escondido 26.97 43.40 27 Via Rancho Parkway
  Del Lago Boulevard, Beethoven Drive Express Lanes access only
28 Centre City Parkway (I-15 Bus. north) Northbound exit and southbound entrance; former US 395 north
28.77 46.30 29 Felicita Road, Citricado Parkway
30.09 48.43 30 9th Avenue, Auto Park Way
30.63 49.29 31 Valley Parkway – Downtown Escondido
  Hale Avenue Northbound exit and southbound entrance for Express Lanes only
  I-15 Express Lanes North end of Express Lanes
31.52 50.73 32 SR 78 – Oceanside, Ramona SR 78 west exit 17, east exits 17A-B.
32.86 52.88 33 El Norte Parkway
33.92 54.59 34 Centre City Parkway (I-15 Bus. south) Southbound exit and northbound entrance; former US 395 south
  36.64 58.97 37 Deer Springs Road (CR S12), Mountain Meadow Road
  40.84 65.73 41 Gopher Canyon Road, Old Castle Road
  43.28 69.65 43 Old Highway 395 Former US 395
  46.49 74.82 46 SR 76 – Pala, Oceanside
  50.59 81.42 51 Mission Road (CR S13) – Fallbrook
  54.07 87.02 54 Rainbow Valley Boulevard
Riverside Temecula 57.70 92.86 58 SR 79 south (Temecula Parkway) – Temecula, Indio South end of SR 79 overlap; former SR 71 south
59.24 95.34 59 Rancho California Road, Old Town Front Street
60.88 97.98 61 SR 79 north (Winchester Road) North end of SR 79 overlap
  62 French Valley Parkway Proposed interchange
Murrieta 63.00 101.39 63 I‑215 north (Escondido Freeway) – Riverside, San Bernardino Northbound exit and southbound entrance; former I-15E north / US 395 north
63.73 102.56 64 To I‑215 north / Murrieta Hot Springs Road – Riverside
64.85 104.37 65 California Oaks Road, Kalmia Street
Wildomar 67.90 109.27 68 Clinton Keith Road
69.33 111.58 69 Baxter Road
70.56 113.56 71 Bundy Canyon Road
Lake Elsinore 73.42 118.16 73 Diamond Drive, Railroad Canyon Road
75.21 121.04 75 Main Street (I-15 Bus. north)
76.54 123.18 77 SR 74 (Central Avenue) – San Juan Capistrano, Perris
78.11 125.71 78 Nichols Road
80.95 130.28 81 Lake Street (I-15 Bus. south)
  84.66 136.25 85 Indian Truck Trail
  87.65 141.06 88 Temescal Canyon Road Former SR 71
Corona 89.90 144.68 90 Weirick Road, Dos Lagos Drive
91.07 146.56 91 Cajalco Road
92.08 148.19 92 El Cerrito Road
92.95 149.59 93 Ontario Avenue Former SR 71
94.61 152.26 95 Magnolia Avenue
95.76 154.11 96 SR 91 (Riverside Freeway) – Riverside, Beach Cities Signed as exits 96A (east) and 96B (west) southbound; former US 91; SR 91 exit 51
Norco 97.14 156.33 97 Hidden Valley Parkway
97.90 157.55 98 Second Street (I-15 Bus. north)
99.86 160.71 100 Sixth Street (I-15 Bus. south)
Eastvale 102 Schleisman Road Proposed interchange[26]
102.52 164.99 103 Limonite Avenue
Jurupa Valley 105 Cantu-Galleano Ranch Road
105.73 170.16 106 SR 60 (Pomona Freeway) – Los Angeles, Riverside Signed as exits 106A (east) and 106B (west) northbound; SR 60 east exit 41, west exit 41A
San Bernardino Ontario 107.55 173.08 108 Jurupa Street Former SR 31 south
108.93 175.31 109 I‑10 (San Bernardino Freeway, I-10 Bus.) – Los Angeles, San Bernardino, Indio Signed as exits 109A (west) and 109B (east) southbound; former US 99; I-10 west exit 58, east exits 58A-B
OntarioRancho Cucamonga line 109.59 176.37 110 4th Street
Rancho Cucamonga 111.85 180.01 112 SR 66 (Foothill Boulevard) Former US 66
113.32 182.37 113 Baseline Road
115 SR 210 – Pasadena, San Bernardino, Redlands Signed as exits 115A (east) and 115B (west) northbound and exits 115A (west) and 115B (east) southbound; SR 210 exit 64A
Fontana 116.16 186.94 116 Summit Avenue
117.91 189.76 117 Duncan Canyon Road Opened on October 23, 2015 for traffic and pedestrian use
119.38 192.12 119 Sierra Avenue
San Bernardino 122.19 196.65 122 Glen Helen Parkway
122.91 197.80 123 I‑215 south (Barstow Freeway) – San Bernardino, Riverside Left exit southbound; former I-15E south / US 66 west / US 91 south / US 395 south; I-215 exit 54B
124.09 199.70 124 Kenwood Avenue Former US 66 east
  129.14 207.83 129 Cleghorn Road Former US 66 west
  130.50 210.02 131 SR 138 – Palmdale, Silverwood Lake
  137.75 221.69 138 Oak Hill Road
  140 Ranchero Road
Hesperia 141.45 227.64 141 US 395 north – Bishop, Adelanto Northbound exit and southbound entrance
To US 395 north / Joshua Street Southbound exit and northbound entrance
143.13 230.35 143 Main Street – Hesperia, Phelan
Victorville 146.72 236.12 147 Bear Valley Road – Lucerne Valley
148 La Mesa Road, Nisqualli Road
149.64 240.82 150 SR 18 west (Palmdale Road, I-15 Bus. north) South end of SR 18 overlap; former US 66 east / US 91 north
150.56 242.30 151A Roy Rogers Drive
151.16 243.27 151B Mojave Drive
152.62 245.62 153A SR 18 east (D Street, I-15 Bus. south) – Victorville, Apple Valley North end of SR 18 overlap; former US 66 / US 91
152.75 245.83 153B E Street
153.53 247.08 154 Stoddard Wells Road
  156.64 252.09 157 Stoddard Wells Road – Bell Mountain
  160.96 259.04 161 Dale Evans Parkway – Apple Valley
  164.82 265.25 165 Wild Wash Road
  169.29 272.45 169 Hodge Road
Barstow 174.97 281.59 175 Outlet Center Drive
177.90 286.30 178 Lenwood Road
179.46 288.81 179 SR 58 west – Bakersfield
180.78 290.94 181 I‑15 Bus. east (L Street) / W. Main Street
182.67 293.98 183 SR 247 south (Barstow Road)
183.55 295.40 184A I‑40 east (Needles Freeway) – Needles Northbound exit and southbound entrance; southbound access is via exit 184
184.08 296.25 184B I‑15 Bus. / CR 66 (E. Main Street) Signed as exit 184 southbound; former US 66
186.01 299.35 186 Old Highway 58 Former SR 58 west / US 91 south / US 466 west
  188.72 303.72 189 Fort Irwin Road Serves Fort Irwin
  190.96 307.32 191 Ghost Town Road Serves the ghost town of Calico
Yermo 193.77 311.84 194 Calico Road – Yermo
195.51 314.64 196 Yermo Road – Yermo
Agricultural Inspection Station (southbound only)
  197.62 318.04 198 Minneola Road
  205.54 330.78 206 Harvard Road
  212.76 342.40 213 Field Road
  216.53 348.47 Clyde V. Kane Rest Area
  220.72 355.21 221 Afton Road
  229.56 369.44 230 Basin Road
  233.37 375.57 233 Rasor Road
Zzyzx 239.31 385.13 239 Zzyzx Road – Zzyzx
Baker 244.95 394.21 245 Baker Boulevard (I-15 Bus. north) – Baker Northbound exit and southbound entrance; former US 91 north / US 466 east
245.70 395.42 246 SR 127 north / Kelbaker Road – Death Valley
247.59 398.46 248 Baker Boulevard (I-15 Bus. south) – Baker Southbound exit and northbound entrance; former US 91 south / US 466 west
Halloran Springs 258.74 416.40 259 Halloran Springs Road
  264.70 425.99 265 Halloran Summit Road
  270.29 434.99 Valley Wells Rest Area
Cima 271.86 437.52 272 Cima Road
  280.60 451.58 281 Bailey Road
  285.59 459.61 286 Nipton Road
  290.53 467.56 291 Yates Well Road
  295.37 475.35 I‑15 north – Las Vegas Continuation into Nevada
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
    Wikimedia Commons has media related to Interstate 15 in California.
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