List of Interstate Highways in California

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Interstate Highways in California
Interstate 5 markerInterstate 15 markerInterstate 580 marker
Standard Interstate signage in California
Highway names
Interstates: Interstate XX (I-XX)
US Routes: U.S. Route XX (US XX)
State: State Route XX (SR XX)
System links

This is a list of Interstates in the U.S. state of California that have existed since the 1964 renumbering. It includes routes that were defined by the California State Legislature but never built, as well as routes that have been 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

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  • 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.
  • If a route was renumbered, the old or new number is given in the "notes" column.
  • The years 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 is signed as part of Business Interstate 80, the only state-maintained Interstate business route in California.

Primary Interstates

Number Length (mi)[3][lower-alpha 1] 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 1947 current
I-5W — — I-5 near Tracy I-5 near Dunnigan 1957 1970 Former designation of I-580 and I-505
I-8 171.98 276.77 Nimitz Boulevard, Sunset Cliffs Boulevard in San Diego I-8 at the Arizona state line 1964 current Westernmost segment between Nimitz Boulevard/Sunset Cliffs Boulevard and I-5 is not officially recognized as an Interstate by the FHWA
I-10 243.31[lower-alpha 2] 391.57 SR 1 in Santa Monica I-10 at the Arizona state line 1947 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[lower-alpha 3] 462.30 I-8 in San Diego I-15 at the Nevada state line 1957 current
I-15E — — I-15 in Temecula I-15 in Devore, California 1973 1982 Renumbered from I-215 in 1973 and back to I-215 in 1982
I-40 154.623 248.842 I-15 in Barstow I-40 at the Arizona state line 1947 current
I-80 205.07 330.03 US 101 in San Francisco I-80 at the Nevada state line 1947 current Westernmost segment between US 101 and the Bay Bridge is not officially recognized as an Interstate by the FHWA
  •       Former
  •       Future
  • Photograph

    I-5 in the Central Valley

  • Photograph

    Heavy traffic in downtown San Bernardino along I-10 near the interchange with the Downtown San Bernardino Freeway (I-215)

  • Photograph

    Former mileage sign at start of Interstate 40 in Barstow, California, 1997

  • Photograph

    Entering California from Nevada along I-80

Auxiliary Interstates

Number Length (mi)[3][lower-alpha 1] 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 1982 current Right-of-way formerly planned as part of SR 42
I-105 — — I-5 in East Los Angeles US 101 in Los Angeles 1964 1968 Renumbered as US 101; part of East Los Angeles Interchange
I-110 23.73[lower-alpha 3] 38.19 SR 47 in San Pedro I-10 in Los Angeles 1978 current Former routing of US 6/SR 11
I-110 — — I-10/I-5 in East Los Angeles US 101 in Los Angeles 1964 1968 Deleted from highway system; part of East Los Angeles Interchange
I-180 — — US 101 in San Rafael I-80 in Berkeley 1981 1991 Former designation of I-580
I-205 12.973 20.878 I-580 near Tracy I-5 near Manteca 1970 current Formerly part of US 50
I-210 44.90[lower-alpha 3] 72.26 I-5 in Los Angeles SR 57 in Glendora 1964 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 1982 current Formerly I-15E and SR 215
I-238 2.126[lower-alpha 3] 3.421 I-580 in Castro Valley I-880 in San Leandro 1983 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 1955 current
I-305 5.64 9.08 I-80 in West Sacramento SR 99 in Sacramento 1981 current Unsigned designation used by the FHWA and the AASHTO ; signed as part of US 50/Business I-80
I-380 1.67 2.69 I-280 in San Bruno US 101 in South San Francisco 1964 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 1964 current
I-480 — — US 101 in San Francisco I-80 in San Francisco 1957 1968 Demoted to state highway in 1968
I-505 32.99 53.09 I-80 in Vacaville I-5 near Dunnigan 1977 current Formerly part of I-5W
I-580 75.550[lower-alpha 2] 121.586 US 101 in San Rafael I-5 near Tracy 1947 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 1964 current
I-680 70.536 113.517 US 101/I-280 in San Jose I-80 in Fairfield 1955 current Formerly part of SR 21
I-710 24.249[lower-alpha 4] 39.025 SR 47 in Long Beach Valley Boulevard in Alhambra 1984 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 1976 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 1959 current
I-880 45.698 73.544 I-280/SR 17 in San Jose I-80/I-580 in Oakland 1984 current Formerly part of SR 17
I-905 8.964 14.426 I-5 in San Diego Mexican broder near Otay Mesa proposed — Currently SR 905
I-980 2.027 3.262 I-880 in Oakland I-580/SR 24 in Oakland 1981 current Right-of-way formerly part of SR 24
  •       Former
  •       Future
  • Photograph

    Westbound view along Interstate 105 through the Interstate 110 interchange

  • Aerial Photograph

    Construction on I-215 between Inland Center Drive and Orange Show Road in San Bernardino

  • Photograph

    I-280 running along near Stanford University

  • Photograph

    Cars driving on I-405 through the Sepulveda Pass

  • Photograph

    Southbound at I-680 near SR 4, with Mount Diablo on the left.

  • Photograph

    The Miramar Road overpass on I-805 northbound, with the Eastgate Mall bridge in the background

See also

Notes

  1. ↑ 1.0 1.1 Lengths rounded to the nearest mile or tenth-mile are estimated from various sources including Google Maps.
  2. ↑ 2.0 2.1 This route is broken into pieces, and the length does not reflect the overlaps that would be required to make the route continuous.
  3. ↑ 3.0 3.1 3.2 3.3 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. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.

External links

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