List of Interstate Highways in California

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Interstate Highways in California

I-5 (CA).svg

I-580 (CA).svg

Business Loop 80 (CA).svg

Highway shields for I-5, I-580, and I-80 Bus. Loop
List of Interstate Highways in California
Interstate Highways highlighted in red; related state routes in purple
System information
Maintained by Caltrans
Length2,466.744 mi (3,969.840 km)
Highway names
Interstates Interstate XX (I-XX)
Business Loop Interstate XX Business Loop (I-XX Bus.)
System links

This is a list of Interstate Highways in the U.S. state of California that have existed since the 1964 renumbering. It includes routes defined by the California State Legislature but never built, as well as routes entirely relinquished to local governments.

Contents

Each state highway in California is maintained by the California Department of Transportation (Caltrans) and is assigned a Route (officially State Highway Route [1] [2] ) number in the Streets and Highways Code (Sections 300-635). Under the code, the state assigns a unique Route X to each highway and does not differentiate between state, US, or Interstate highways.

Overview

Lengths for each state route were initially measured as they were during the 1964 state highway renumbering (or during the year the route was established, if after 1964) based alignment that existed at the time, and do not necessarily reflect the current mileage. Portions of some routes have been relinquished to or are otherwise maintained by local or other governments, and may not be included in the length listed below. Several routes are broken into non-contiguous pieces, and their lengths may not reflect the overlaps that would be required to make them continuous. Some routes may also have a gap because it is either explicitly defined in the California Streets and Highways Code or due to an unconstructed portion, and the listed length may or may not reflect the gap. Additionally, if a route was renumbered, the old or new number is given in the "notes" column. Years shown are when legislative action was taken, not when real-world changes were made.

Concurrences are not explicitly codified in the Streets and Highways Code; such highway segments are listed on only one of the corresponding legislative route numbers—for example, the I-80/I-580 concurrency, known as the Eastshore Freeway, is only listed under Route 80 in the highway code while the definition of Route 580 is broken into non-contiguous segments. When a highway is broken into such segments, the total length recorded by Caltrans only reflects those non-contiguous segments, and does not include those overlaps that would be required to make the route continuous.

Since the 1990s, a number of piecemeal relinquishments have been made. These are generally reflected in the length but not the termini. Former termini are not shown if they are along the current route, meaning that the route was simply extended.

One Interstate Highway—Interstate 305—is defined only federally; the state calls it part of US 50. It was signed as part of Business Interstate 80, the only state-maintained Interstate business route in California.

Primary Interstates

NumberLength (mi) [3] [lower-alpha 1] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-5 (1961).svg I-5 796.4321,281.733 Mexican border in San Ysidro, San Diego I-5 at the Oregon state line01947-01-011947current
I-5E (1961).svg I-5E I-5 near Tracy I-5 near Dunnigan 01957-01-01195701970-08-151970Former designation of I-5 when I-5W existed
I-5W (1961).svg I-5W I-5 near Tracy I-5 near Dunnigan 01957-01-01195701970-08-151970Former designation of I-580 and I-505
I-7.svg I-7 302486 I-5 at Wheeler Ridge I-5 in Stockton proposedCaltrans has proposed I-7 or I-9 for SR 99 in central California
I-8 (1961).svg I-8 171.98276.77Nimitz Boulevard, Sunset Cliffs Boulevard in San Diego I-8 at the Arizona state line01964-01-011964currentWesternmost segment between Nimitz Boulevard/Sunset Cliffs Boulevard and I-5 is not officially recognized as an Interstate by the FHWA
I-9.svg I-9 302486 I-5 at Wheeler Ridge I-5 in Stockton proposedCaltrans has proposed I-7 or I-9 for SR 99 in central California
I-10 (1961).svg I-10 243.31 [lower-alpha 2] 391.57 SR 1 in Santa Monica I-10 at the Arizona state line01947-01-011947currentRoute 10, as defined by the state, is broken into two segments at the East Los Angeles Interchange; traffic is directed via I-5 to connect the two; the portion between I-5 and US 101 not signed
I-15 (1961).svg I-15 287.26 [lower-alpha 3] 462.30 I-8 in San Diego I-15 at the Nevada state line01957-01-011957current
I-15E (1961).svg I-15E I-15 in Temecula I-15 in Devore, California 01973-01-01197301982-01-011982Renumbered from I-215 in 1973 and back to I-215 in 1982
I-15W (1961).svg I-15W I-15 in Murrieta I-15 in Devore, California 01972-01-01197201974-01-011974Temporary Signage along current I-15
I-40 (1961).svg I-40 154.623248.842 I-15 in Barstow I-40 at the Arizona state line01947-01-011947current
I-80 (1961).svg I-80 205.07330.03 US 101 in San Francisco I-80 at the Nevada state line01947-01-011947currentWesternmost segment between US 101 and the Bay Bridge is not officially recognized as an Interstate by the FHWA
  •       Former
  •       Proposed and unbuilt

Auxiliary Interstates

NumberLength (mi) [3] [lower-alpha 1] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-105 (1961).svg I-105 18.8230.29 SR 1 in El Segundo I-605 in Norwalk 01982-01-011982currentRight-of-way formerly planned as part of SR 42
I-105 (1961).svg I-105 I-5 in East Los Angeles US 101 in Los Angeles 01964-01-01196401968-01-011968Renumbered as US 101; part of East Los Angeles Interchange
I-110 (1961).svg I-110 23.73 [lower-alpha 3] 38.19 SR 47 in San Pedro I-10 in Los Angeles 01978-01-011978currentFormer routing of US 6/SR 11
I-110 (1961).svg I-110 I-10/I-5 in East Los Angeles US 101 in Los Angeles 01964-01-01196401968-01-011968Deleted from highway system; part of East Los Angeles Interchange
I-180 (1961).svg I-180 US 101 in San Rafael I-80 in Berkeley 01981-01-01198101991-01-011991Former designation of I-580
I-205 (1961).svg I-205 12.97320.878 I-580 near Tracy I-5 near Manteca 01970-01-011970currentFormerly part of US 50
I-210 (1961).svg I-210 44.90 [lower-alpha 3] 72.26 I-5 in Los Angeles SR 57 in Glendora 01964-01-011964currentEntire length of SR 210 to be renumbered to I-210. SR 57 from I-10 to I-210/SR 210 is an unsigned designation of I-210 used by the FHWA and AASHTO
I-215 (1961).svg I-215 55.06088.610 I-15 in Murrieta I-15 in San Bernardino 01982-01-011982currentFormerly I-15E and SR 215
I-238 (1961).svg I-238 2.126 [lower-alpha 3] 3.421 I-580 in Castro Valley I-880 in San Leandro 01983-01-011983currentTechnically a spur of I-80; only violation in the Interstate system
I-280 (1961).svg I-280 57.51092.553 US 101/I-680 in San Jose King and 5th Streets in San Francisco 01955-01-011955current
I-305 (1961).svg I-305 5.649.08 I-80 in West Sacramento SR 99 in Sacramento 01981-01-011981currentUnsigned designation used by the FHWA and the AASHTO; signed as part of US 50
I-380 (1961).svg I-380 1.672.69 I-280 in San Bruno US 101 in South San Francisco 01964-01-011964currentFormerly proposed to be extended west to SR 1 and east along the Southern Crossing to I-880
I-405 (1961).svg I-405 72.415116.541 I-5 in Irvine I-5 near San Fernando 01964-01-011964current
I-480 (1961).svg I-480 US 101 in San Francisco I-80 in San Francisco 01957-01-01195701968-01-011968Demoted to state highway in 1968
I-505 (1961).svg I-505 32.9953.09 I-80 in Vacaville I-5 near Dunnigan 01977-01-011977currentFormerly part of I-5W
I-580 (1961).svg I-580 75.550 [lower-alpha 2] 121.586 US 101 in San Rafael I-5 near Tracy 01947-01-011947currentVarious segments formerly part of US 50, I-5W or SR 17
I-605 (1961).svg I-605 27.4044.10 I-405/SR 22 in Seal Beach I-210 in Irwindale 01964-01-011964current
I-680 (1961).svg I-680 70.536113.517 US 101/I-280 in San Jose I-80 in Fairfield 01955-01-011955currentFormerly part of SR 21
I-710 (1961).svg I-710 24.249 [lower-alpha 4] 39.025 SR 47 in Long Beach Valley Boulevard in Alhambra 01984-01-011984currentFormerly part of SR 7. The portions north of I-10 and south of SR 1 are not officially recognized as Interstates by the FHWA
I-780 (1961).svg I-780 6.75910.878 I-80 in Vallejo I-680 in Benicia 01976-01-011976currentFormerly part of I-680
I-805 (1961).svg I-805 28.01645.087 I-5 in San Ysidro, San Diego I-5 in Sorrento Valley, San Diego 01959-01-011959current
I-880 (1961).svg I-880 45.69873.544 I-280/SR 17 in San Jose I-80/I-580 in Oakland 01984-01-011984currentFormerly part of SR 17
I-905 (1961).svg I-905 8.96414.426 I-5 in San Diego Mexican border near Otay Mesa proposedCurrently SR 905
I-980 (1961).svg I-980 2.0273.262 I-880 in Oakland I-580/SR 24 in Oakland 01981-01-011981currentRight-of-way formerly part of SR 24
  •       Former
  •       Proposed and unbuilt

Business Routes

NumberLength (mi) [3] [lower-alpha 1] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
Business Loop 5 (CA).svg I-5 BL I-5 in San Ysidro I-5 in Chula Vista 01960-01-01c.196001990-01-011990old US 101 along Beyer Boulevard, Broadway, Harbor Drive, and Pacific Highway.
Business Loop 5 (CA).svg I-5 BL I-5 in San Diego I-5 in San Diego 02005-01-012005old US 101 along Mission Bay Drive.
Business Loop 5 (CA).svg I-5 BL I-5 in San Diego I-5 in Oceanside 01960-01-01c.1960currentold US 101 along Coast Highway (CR S-21).
Business Loop 5 (CA).svg I-5 BL I-5 in Glendale I-5 in Granada Hills 01970-01-01c.197001980-01-011980travels along San Fernando Road (old US 99 and US 6).
Business Loop 5 (CA).svg I-5 BL I-5 in Woodland I-5 in Woodland 01970-01-01c.197001980-01-011980Between I-5 Exits 537 and 540.
Business Loop 5 (CA).svg I-5 BL 1.11.8 I-5 in Arbuckle I-5 in Arbuckle Between I-5 Exits 566 and 567.
Business Loop 5 (CA).svg I-5 BL I-5 in Williams I-5 in Maxwell Between I-5 Exits 575 and 588.
Business Loop 5 (CA).svg I-5 BL I-5 in Willows I-5 in Orland Between I-5 Exits 601 and 621.
Business Loop 5 (CA).svg I-5 BL 4.26.8 I-5 in Red Bluff I-5 in Red Bluff Between I-5 Exits 647 and 651.
Business Loop 5 (CA).svg I-5 BL I-5 in Cottonwood I-5 in Cottonwood old US 99 between I-5 Exits 662 and 665.
Business Loop 5 (CA).svg I-5 BL 3.76.0 I-5 in Dunsmuir I-5 in Dunsmuir old US 99 along Dunsmuir Avenue between I-5 Exits 729 and 732.
Business Loop 5 (CA).svg I-5 BL 3.86.1 I-5 in Mount Shasta I-5 in Mount Shasta Between I-5 Exits 647 and 651.
Business Loop 5 (CA).svg I-5 BL I-5 in Weed I-5 in Weed old US 99 between I-5 Exits 747 and 748.
Business Loop 5 (CA).svg I-5 BL I-5 in Yreka I-5 in Yreka Between I-5 Exits 773 and 776.
Business Loop 8 (CA).svg I-8 BL I-8 in San Diego I-8 in La Mesa 01970-01-01c.197001995-01-011995Between I-8 Exits 4B-C and 13A (Washington Street, Normal Street, El Cajon Boulevard)
Business Loop 8 (CA).svg I-8 BL 8.1513.12 I-8 in El Cajon I-8 in Lakeside Between I-8 Exits 15 and 23
Business Loop 8 (CA).svg I-8 BL 4.256.84 I-8 in Alpine I-8 in Alpine former US 80 along Alpine Drive between I-8 Exits 30 and 33
Business Loop 8 (CA).svg I-8 BL 4.256.84 I-8 in El Centro I-8 in El Centro Between I-8 Exits 114 and 115
Business Loop 8 (CA).svg I-8 BL 2.183.51 I-8 in Alpine Bus.I-8 in Yuma, AZ Historic US 80 between I-8 Exit 170 and AZ line
Business Loop 10 (CA).svg I-10 BL 7.912.7 I-10 in Pomona I-10 in Ontario former US 70/US 99 between I-10 Exits 42B and 55A
Business Loop 10 (CA).svg I-10 BL I-10 in Fontana I-10 in Colton former US 70/US 99 between I-10 Exits 59 and 71
Business Loop 10 (CA).svg I-10 BL I-10 in Colton I-10 in Coachella former US 60/US 70/US 99 between I-10 Exits 139 and 146
Business Loop 10 (CA).svg I-10 BL 7.912.7 I-10 in Blythe I-10 in Blythe former US 60/US 70 between I-10 Exits 236 and 243
Business Loop 15 (CA).svg I-15 BL I-15 in Escondido I-15 in Escondido former US 395 between I-15 Exits 28 and 34
Business Loop 15 (CA).svg I-15 BL I-15 in Lake Elsinore I-15 in Lake Elsinore Between I-15 Exits 73 and 75
Business Loop 15 (CA).svg I-15 BL I-15 in Norco I-15 in Norco Between I-15 Exits 98 and 100
Business Loop 15 (CA).svg I-15 BL I-15 in Victorville I-15 in Victorville Historic US 66/US 91 between I-15 Exits 150 and 153A
Business Loop 15 (CA).svg I-15 BL I-15 in Barstow I-15 in Barstow Historic US 66/US 91 between I-15 Exits 181 and 184B
Business Loop 15 (CA).svg I-15 BL 3.65.8 I-15 in Baker I-15 in Baker Old US 91/US 466 between I-15 Exits 245 and 248
Business Loop 40 (CA).svg I-40 BL 3.45.5 I-40 in Needles I-40 in Needles Old US 66/US 95 between I-40 Exits 141 and 145
Business Loop 80 (CA).svg I-80 BL 13.8222.24 I-80 in West Sacramento I-80 in Sacramento 01980-01-01c.1980currentBetween I-80 Exits 82 and 95
Business Loop 205 (CA).svg I-205 BL I-205 in Tracy I-5 in Lathrop Old US 50 between I-205 Exit 4 and I-5 Exit 458B
  •       Former
  •       Proposed and unbuilt

See also

Notes

  1. 1 2 3 Lengths rounded to the nearest mile or one-mile are estimated from various sources including Google Maps.
  2. 1 2 This route is broken into pieces, and the length does not reflect the overlaps that would be required to make the route continuous.
  3. 1 2 3 4 Part of one of the contiguous routes that is partially signed as an Interstate Highway, while the remaining segment is signed as a state highway.
  4. This route is broken into pieces due to a gap in the description, unfilled by any route.

Related Research Articles

<span class="mw-page-title-main">Interstate 580 (California)</span> Interstate highway in California

Interstate 580 (I-580) is an approximately 76-mile-long (122 km) east–west auxiliary Interstate Highway in Northern California. The heavily traveled spur route of I-80 runs from US Route 101 (US 101) in San Rafael in the San Francisco Bay Area to I-5 at a point outside the southern city limits of Tracy in the Central Valley. I-580 forms a concurrency with I-80 between Albany and Oakland, the latter of which is the location of the MacArthur Maze interchange immediately east of the San Francisco–Oakland Bay Bridge. I-580 provides a connection from the Bay Area to the southern San Joaquin Valley and Southern California via I-5, as I-5 bypasses the Bay Area to the east.

<span class="mw-page-title-main">State highways in California</span>

The state highway system of the U.S. state of California is a network of highways that are owned and maintained by the California Department of Transportation (Caltrans).

<span class="mw-page-title-main">Interstate 710 and State Route 710 (California)</span> Interstate and state highway in California

Route 710, consisting of the non-contiguous segments of State Route 710 (SR 710) and Interstate 710 (I-710), is a major north–south state highway and auxiliary Interstate Highway in the Los Angeles metropolitan area of the U.S. state of California. Also called the Los Angeles River Freeway prior to November 18, 1954, the highway was initially planned to connect Long Beach and Pasadena, but a gap in the route exists from Alhambra to Pasadena through South Pasadena due to community opposition to its construction.

<span class="mw-page-title-main">California State Route 13</span> State highway in Alameda County, California, United States

State Route 13 is a state highway in the U.S. state of California. It runs entirely in Alameda County, connecting Interstate 580 in Oakland to Interstate 80/Interstate 580 in Berkeley.

<span class="mw-page-title-main">Interstate 238 and State Route 238 (California)</span> Highway in California

Route 238, consisting of State Route 238 (SR 238) and Interstate 238 (I-238), is a mostly north–south state and auxiliary Interstate highway in the San Francisco Bay Area of California. The southern segment is signed as SR 238 and is a divided multilane surface highway that runs parallel to the Hayward hills between I-680 in Fremont and I-580 in Castro Valley. The northern segment is signed as I-238 and is a six-lane freeway that runs more east–west between I-580 and I-880 in San Leandro.

<span class="mw-page-title-main">California State Route 60</span> State highway in California

State Route 60 (SR 60) is an east–west state highway in the U.S. state of California. It serves the cities and communities on the eastern side of the Los Angeles metropolitan area and runs along the south side of the San Gabriel Valley. It functions as a bypass route of Interstate 10 (I-10) through the area between the East Los Angeles Interchange in Los Angeles and Beaumont. SR 60 provides a route across several spurs of the Peninsular Ranges, linking the Los Angeles Basin with the Pomona Valley and San Gabriel Valley. The highway also runs concurrently with SR 57 and I-215. Portions of SR 60 are designated as either the Pomona Freeway or the Moreno Valley Freeway.

<span class="mw-page-title-main">California State Route 237</span> Highway in California

State Route 237 is a state highway in the U.S. state of California that runs from El Camino Real in Mountain View to Interstate 680 in Milpitas. Known as the Southbay Freeway for most of its length, SR 237 runs south of the San Francisco Bay, connecting the East Bay to the Peninsula.

<span class="mw-page-title-main">California State Route 123</span> Highway in California

State Route 123 is a 7.39-mile (11.89 km) state highway in the U.S. state of California in the San Francisco Bay Area. Named San Pablo Avenue for almost its entire length except for its northernmost 0.10 miles (0.16 km), SR 123 is a major north–south state highway along the flats of the urban East Bay. Route 123 runs between Interstate 580 in Oakland in the south and Interstate 80 at Cutting Boulevard in Richmond in the north. San Pablo Avenue itself, a portion of Historic US 40, continues well past the SR 123 designation south to Downtown Oakland and north to Crockett.

<span class="mw-page-title-main">California State Route 39</span> Highway in California

State Route 39 is a state highway in the U.S. state of California that travels through Orange and Los Angeles counties. Its southern terminus is at Pacific Coast Highway, in Huntington Beach. SR 39's northern terminus is at Islip Saddle on Angeles Crest Highway in the Angeles National Forest, but its northernmost 4.5-mile (7.2 km) segment has been closed to public highway traffic since 1978 due to a massive mud and rockslide.

<span class="mw-page-title-main">California State Route 84</span> Highway in California

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<span class="mw-page-title-main">Foothill Freeway</span> Interstate and state highway in California

The Foothill Freeway is a freeway in the Los Angeles metropolitan area, California, United States, running from the Sylmar district of Los Angeles east to Redlands. The western segment is signed as Interstate 210 (I-210) from its western end at I-5 to SR 57 in Glendora, while the eastern segment is signed as State Route 210 (SR 210) to its eastern terminus at I-10. Under the California Streets and Highways Code, the entire Foothill Freeway is legally referred to as Route 210.

<span class="mw-page-title-main">California State Route 66</span> Highway in California

State Route 66 is a state highway in the U.S. state of California that runs along a section of old U.S. Route 66 in Los Angeles and San Bernardino counties. It goes from State Route 210 in La Verne east to Interstate 215 in San Bernardino, passing through Claremont, Upland, Rancho Cucamonga, Fontana and Rialto along Foothill Boulevard. In San Bernardino, it is the part of Fifth Street west of H Street.

<span class="mw-page-title-main">California State Route 12</span> State highway in California, United States

State Route 12 is a state highway in the U.S. state of California that travels in an east–west direction from State Route 116 in Sebastopol in Sonoma County to State Route 49 just north of San Andreas in Calaveras County. The route connects the Sonoma and Napa valleys with the Sacramento–San Joaquin River Delta and the Sierra Foothills. It is constructed to freeway standards from the Fulton Road/South Wright Road stoplight in Santa Rosa, to its partial interchange with Farmers Lane.

<span class="mw-page-title-main">California State Route 132</span> Highway in California

State Route 132 is a state highway in the U.S. state of California that connects the Central Valley with the Sierra Nevada foothills and the California Gold Country. Its western segment also connects the city of Modesto with the San Francisco Bay Area via I-580, although this route is discouraged due to it being a two-lane road between Modesto and Interstate 5. East of Modesto, the road climbs the foothills and eventually ends at SR 49 at Coulterville.

<span class="mw-page-title-main">California State Route 185</span> Highway in California

State Route 185 is a state highway in the San Francisco Bay Area of the U.S. state of California. It runs along sections of Mission Boulevard in Hayward, East 14th Street in San Leandro and International Boulevard in Oakland. At its south end, SR 185 connects with State Routes 92 and 238 in Hayward. At the north end of SR 185 at International Boulevard and 42nd Avenue, the short State Route 77 heads southwest to Interstate 880.

<span class="mw-page-title-main">California State Route 127</span> Highway in California

State Route 127 is a state highway in the U.S. state of California that connects Interstate 15 in Baker to Nevada State Route 373 at the Nevada state line, passing near the eastern boundary of Death Valley National Park. The entire length of the highway closely follows the central portion of the former Tonopah and Tidewater Railroad and loosely follows the Amargosa River.

<span class="mw-page-title-main">California State Route 244</span> Highway in California

State Route 244 is an unsigned state highway in the U.S. state of California located northeast of Sacramento. It serves as a short freeway connection between the Interstate 80/Interstate 80 Business junction and Auburn Boulevard. SR 244 was first added to the state highway system in 1959 as Legislative Route 288, and was renumbered as SR 244 in the 1964 renumbering. Portions of this route have been removed from the system as recently as 1994.

<span class="mw-page-title-main">Interstate 80 in California</span> Section of Interstate Highway in California, United States

Interstate 80 (I-80) is a transcontinental Interstate Highway in the United States, stretching from San Francisco, California, to Teaneck, New Jersey. The segment of I-80 in California runs east from San Francisco across the San Francisco–Oakland Bay Bridge to Oakland, where it turns north and crosses the Carquinez Bridge before turning back northeast through the Sacramento Valley. I-80 then traverses the Sierra Nevada, cresting at Donner Summit, before crossing into the state of Nevada within the Truckee River Canyon. The speed limit is at most 65 mph (105 km/h) along the entire route instead of the state's maximum of 70 mph (110 km/h) as most of the route is in either urban areas or mountainous terrain. I-80 has portions designated as the Eastshore Freeway and Alan S. Hart Freeway.

References

  1. "Section 231"  . California Streets and Highways Code via Wikisource.
  2. California Department of Transportation. "Other State Highway Routes". Sacramento: California Department of Transportation.
  3. 1 2 3 California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on September 5, 2015. Retrieved June 30, 2015.