List of Interstate Highways in California

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Interstate Highways in California
System information
Maintained by Caltrans
Length2,466.744 mi (3,969.840 km)
Highway names
InterstatesInterstate XX (I-XX)
Business LoopInterstate 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.

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

Number Length (mi)[3][a] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-5 796.432 1,281.733 Mexican border in San Ysidro, San Diego I-5 at the Oregon state line 01947-01-011947 current
I-5E — — I-5 near Tracy I-5 near Dunnigan 01957-01-011957 01970-11-101970 Former designation of I-5 when I-5W existed
I-5W — — I-5 near Tracy I-5 near Dunnigan 01957-01-011957 01970-11-101970 Former designation of I-580 and I-505
I-7 302 486 I-5 at Wheeler Ridge I-5 in Stockton proposed — Caltrans has proposed I-7 or I-9 for SR 99 in central California
I-8 171.98 276.77 Nimitz Boulevard, Sunset Cliffs Boulevard in San Diego I-8 at the Arizona state line 01964-01-011964 current Westernmost segment between Nimitz Boulevard/Sunset Cliffs Boulevard and I-5 is not officially recognized as an Interstate by the FHWA
I-9 302 486 I-5 at Wheeler Ridge I-5 in Stockton proposed — Caltrans has proposed I-7 or I-9 for SR 99 in central California
I-10 243.31[b] 391.57 SR 1 in Santa Monica I-10 at the Arizona state line 01947-01-011947 current Route 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-15 287.26[c] 462.30 I-8 in San Diego I-15 at the Nevada state line 01957-01-011957 current
I-15E — — I-15 in Temecula I-15 in Devore, California 01973-01-011973 01982-01-011982 Renumbered from I-215 in 1973 and back to I-215 in 1982
I-15W — — I-15 in Murrieta I-15 in Devore, California 01972-01-011972 01974-01-011974 Temporary Signage along current I-15
I-40 154.623 248.842 I-15 in Barstow I-40 at the Arizona state line 01947-01-011947 current
I-80 205.07 330.03 US 101 in San Francisco I-80 at the Nevada state line 01947-01-011947 current Westernmost segment between US 101 and the Bay Bridge is not officially recognized as an Interstate by the FHWA
  •       Former
  •       Proposed and unbuilt

Auxiliary Interstates

Number Length (mi)[3][a] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-105 18.82 30.29 SR 1 in El Segundo I-605 in Norwalk 01982-01-011982 current Right-of-way formerly planned as part of SR 42
I-105 — — I-5 in East Los Angeles US 101 in Los Angeles 01964-01-011964 01968-01-011968 Renumbered as US 101; part of East Los Angeles Interchange
I-110 23.73[c] 38.19 SR 47 in San Pedro I-10 in Los Angeles 01978-01-011978 current Former routing of US 6/SR 11
I-110 — — I-10/I-5 in East Los Angeles US 101 in Los Angeles 01964-01-011964 01968-01-011968 Deleted from highway system; part of East Los Angeles Interchange
I-180 — — US 101 in San Rafael I-80 in Berkeley 01981-01-011981 01991-01-011991 Former designation of I-580
I-205 12.973 20.878 I-580 near Tracy I-5 near Manteca 01970-01-011970 current Formerly part of US 50
I-210 44.90[c] 72.26 I-5 in Los Angeles SR 57 in Glendora 01964-01-011964 current Entire 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 55.060 88.610 I-15 in Murrieta I-15 in San Bernardino 01982-01-011982 current Formerly I-15E and SR 215
I-238 2.126[c] 3.421 I-580 in Castro Valley I-880 in San Leandro 01983-01-011983 current Technically a spur of I-80; only violation in the Interstate system
I-280 57.510 92.553 US 101/I-680 in San Jose King and 5th Streets in San Francisco 01955-01-011955 current
I-305 5.64 9.08 I-80 in West Sacramento SR 99 in Sacramento 01981-01-011981 current Unsigned designation used by the FHWA and the AASHTO; signed as part of US 50
I-380 1.67 2.69 I-280 in San Bruno US 101 in South San Francisco 01964-01-011964 current Formerly proposed to be extended west to SR 1 and east along the Southern Crossing to I-880
I-405 72.415 116.541 I-5 in Irvine I-5 near San Fernando 01964-01-011964 current
I-480 — — US 101 in San Francisco I-80 in San Francisco 01957-01-011957 01968-01-011968 Demoted to state highway in 1968
I-505 32.99 53.09 I-80 in Vacaville I-5 near Dunnigan 01977-01-011977 current Formerly part of I-5W
I-580 75.550[b] 121.586 US 101 in San Rafael I-5 near Tracy 01947-01-011947 current Various segments formerly part of US 50, I-5W or SR 17
I-605 27.40 44.10 I-405/SR 22 in Seal Beach I-210 in Irwindale 01964-01-011964 current
I-680 70.536 113.517 US 101/I-280 in San Jose I-80 in Fairfield 01955-01-011955 current Formerly part of SR 21
I-710 24.249[d] 39.025 SR 47 in Long Beach Valley Boulevard in Alhambra 01984-01-011984 current Formerly 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 6.759 10.878 I-80 in Vallejo I-680 in Benicia 01976-01-011976 current Formerly part of I-680
I-805 28.016 45.087 I-5 in San Ysidro, San Diego I-5 in Sorrento Valley, San Diego 01959-01-011959 current
I-880 45.698 73.544 I-280/SR 17 in San Jose I-80/I-580 in Oakland 01984-01-011984 current Formerly part of SR 17
I-905 8.964 14.426 I-5 in San Diego Mexican border near Otay Mesa proposed — Currently SR 905
I-980 2.027 3.262 I-880 in Oakland I-580/SR 24 in Oakland 01981-01-011981 current Right-of-way formerly part of SR 24
  •       Former
  •       Proposed and unbuilt

Business Routes

Number Length (mi)[3][a] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-5 BL — — I-5 in San Ysidro I-5 in Chula Vista 01960-01-01c. 1960 01990-01-011990 old US 101 along Beyer Boulevard, Broadway, Harbor Drive, and Pacific Highway.
I-5 BL — — I-5 in San Diego I-5 in San Diego — 02005-01-012005 old US 101 along Mission Bay Drive.
I-5 BL — — I-5 in San Diego I-5 in Oceanside 01960-01-01c. 1960 current old US 101 along Coast Highway (CR S-21).
I-5 BL — — I-5 in Glendale I-5 in Granada Hills 01970-01-01c. 1970 01980-01-011980 travels along San Fernando Road (old US 99 and US 6).
I-5 BL — — I-5 in Woodland I-5 in Woodland 01970-01-01c. 1970 01980-01-011980 Between I-5 Exits 537 and 540.
I-5 BL 1.1 1.8 I-5 in Arbuckle I-5 in Arbuckle — — Between I-5 Exits 566 and 567.
I-5 BL — — I-5 in Williams I-5 in Maxwell — — Between I-5 Exits 575 and 588.
I-5 BL — — I-5 in Willows I-5 in Orland — — Between I-5 Exits 601 and 621.
I-5 BL 4.2 6.8 I-5 in Red Bluff I-5 in Red Bluff — — Between I-5 Exits 647 and 651.
I-5 BL — — I-5 in Cottonwood I-5 in Cottonwood — — old US 99 between I-5 Exits 662 and 665.
I-5 BL 3.7 6.0 I-5 in Dunsmuir I-5 in Dunsmuir — — old US 99 along Dunsmuir Avenue between I-5 Exits 729 and 732.
I-5 BL 3.8 6.1 I-5 in Mount Shasta I-5 in Mount Shasta — — Between I-5 Exits 647 and 651.
I-5 BL — — I-5 in Weed I-5 in Weed — — old US 99 between I-5 Exits 747 and 748.
I-5 BL — — I-5 in Yreka I-5 in Yreka — — Between I-5 Exits 773 and 776.
I-8 BL — — I-8 in San Diego I-8 in La Mesa 01970-01-01c. 1970 01995-01-011995 Between I-8 Exits 4B-C and 13A (Washington Street, Normal Street, El Cajon Boulevard)
I-8 BL 8.15 13.12 I-8 in El Cajon I-8 in Lakeside — — Between I-8 Exits 15 and 23
I-8 BL 4.25 6.84 I-8 in Alpine I-8 in Alpine — — former US 80 along Alpine Drive between I-8 Exits 30 and 33
I-8 BL 4.25 6.84 I-8 in El Centro I-8 in El Centro — — Between I-8 Exits 114 and 115
I-8 BL 2.18 3.51 I-8 in Alpine Bus.I-8 in Yuma, AZ — — Historic US 80 between I-8 Exit 170 and AZ line
I-10 BL 7.9 12.7 I-10 in Pomona I-10 in Ontario — — former US 70/US 99 between I-10 Exits 42B and 55A
I-10 BL — — I-10 in Fontana I-10 in Colton — — former US 70/US 99 between I-10 Exits 59 and 71
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
I-10 BL 7.9 12.7 I-10 in Blythe I-10 in Blythe — — former US 60/US 70 between I-10 Exits 236 and 243
I-15 BL — — I-15 in Escondido I-15 in Escondido — — former US 395 between I-15 Exits 28 and 34
I-15 BL — — I-15 in Lake Elsinore I-15 in Lake Elsinore — — Between I-15 Exits 73 and 75
I-15 BL — — I-15 in Norco I-15 in Norco — — Between I-15 Exits 98 and 100
I-15 BL — — I-15 in Victorville I-15 in Victorville — — Historic US 66/US 91 between I-15 Exits 150 and 153A
I-15 BL — — I-15 in Barstow I-15 in Barstow — — Historic US 66/US 91 between I-15 Exits 181 and 184B
I-15 BL 3.6 5.8 I-15 in Baker I-15 in Baker — — Old US 91/US 466 between I-15 Exits 245 and 248
I-40 BL 3.4 5.5 I-40 in Needles I-40 in Needles — — Old US 66/US 95 between I-40 Exits 141 and 145
I-80 BL 13.82 22.24 I-80 in West Sacramento I-80 in Sacramento 01980-01-01c. 1980 current Between I-80 Exits 82 and 95
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

Notes

  1. ^ a b c Lengths rounded to the nearest mile or one-mile are estimated from various sources including Google Maps.
  2. ^ a b This route is broken into pieces, and the length does not reflect the overlaps that would be required to make the route continuous.
  3. ^ a b c d 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.

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. ^ a b c California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
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