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California State Route 4

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Title: California State Route 4  
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Subject: List of state highways in California, Interstate 680 (California), Interstate 80 in California, Martinez, California, Dardanelles Cone
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California State Route 4

State Route 4 marker

State Route 4
Route information
Defined by S&HC § 304
Maintained by Caltrans
Length: 197 mi[1] (317 km)
Existed: 1934[2] – present
Ebbetts Pass Scenic Byway
Restrictions: Segment through Ebbetts Pass closed in winter
Major junctions
West end: I‑80 in Hercules
  I‑680 in Concord
SR 242 in Concord
SR 160 near Antioch
I‑5 in Stockton
SR 99 in Stockton
SR 49 in Angels Camp
East end: SR 89 near Markleeville
Highway system
SR 3 I‑5
Roadside art, Ebbetts Pass Scenic Byway.

State Route 4 (SR 4) is a state highway in the U.S. state of California, routed from Interstate 80 in the San Francisco Bay Area to State Route 89 in the Sierra Nevada. It passes through Ebbetts Pass and contains the Ebbetts Pass Scenic Byway, a National Scenic Byway.

SR 4 roughly parallels the Sacramento-San Joaquin River Delta, a popular area for boating and fishing. There are a number of accesses to marinas and other attractions.

Route description

Intersection of California State Routes 4 & 89

State Route 4 is part of the California Freeway and Expressway System[3] and is eligible for the State Scenic Highway System.[4] However, it is only a scenic highway as designated by Caltrans from a point east of Arnold to SR 89.[5] SR 4 is also known as the John Muir Parkway from I-80 in Hercules to I-680 near Martinez, named for the environmentalist John Muir.[6] The stretch through Franklin Canyon was once known as "Blood Alley."[7]

SR 4, an east–west highway, begins in Hercules at San Pablo Avenue next to the Interstate 80 junction as part of John Muir Parkway. (The actual parkway extends a bit past the western terminus.) The road is an expressway from its starting point until it approaches Martinez, at which point it becomes a full freeway (the California Delta Highway) passing Concord, Pittsburg, and Antioch. The John Muir National Historic Site is located directly north of Route 4 on Alhambra Avenue in Martinez. Alhambra Avenue at SR 4 is also the site of the Franklin Canyon Adobe. BART tracks run in the median of the freeway from the Port Chicago Highway interchange in Concord to the Bailey Road interchange in Bay Point, where the line currently ends at the Pittsburg/Bay Point Station. Access to that station is provided by a pedestrian bridge crossing over the eastbound lanes of Highway 4. After Antioch, the freeway turns southward at its intersection with State Route 160, turning into a suburban and rural road bypassing the Bay Area's outermost eastern suburbs (Oakley and Brentwood); this section is also known as the John Marsh Heritage Highway.

Route 4 east continues to Stockton, where it briefly joins I-5 and then enters a separate freeway (known locally as the Crosstown Freeway) routing almost directly through downtown Stockton. The route then runs concurrent with State Route 99 before running eastward into the Sierra through Angels Camp, one of the richest quartz mining sections of the Mother Lode and home of "The Celebrated Jumping Frog of Calaveras County", and Calaveras Big Trees State Park. The route runs through the 8,050 ft (2,450 m). Pacific Grade Summit on its way up to the 8,730 ft (2,660 m) Ebbetts Pass and ends at State Route 89 ten miles (16 km) west of Topaz Lake, on the California–Nevada border. The portion from Arnold to its terminus is designated the Ebbetts Pass Scenic Byway, which is eventually one lane.

Through the mountains, SR 4 is not suitable for large trucks, buses, or RVs, as it becomes very steep and narrow, with no center dividing line shortly after the Mount Reba Turnoff to Bear Valley Ski area, with tight switchbacks. The pass is not plowed for snow, and thus closes during the winter months often from November through as late as May. Thus, no passage between the Mount Reba Turnoff and Markleeville is possible. The western slope is plowed and rarely closes, even for a few hours, but often has chain restrictions during and immediately following storms, usually just east of Arnold. The eastern slope is not plowed.


Although segments of Route 4 were part of the state highway system since 1909, Route 4 was officially designated as such between US Route 40 (now Interstate 80) and State Route 99 in 1934. Prior to that date, the then existing segment was officially known as the "Borden Highway", and the bridge over the San Joaquin River is still referred to as the "Borden Highway Bridge" in tidal tables. Construction of Route 4 did not finish until 1935, however.[2]

The portion of Route 4 from US Route 40 to State Route 24 was added to the highway system in 1933 as Legislative Route Number (LRN) 106. East of the concurrency with State Route 24 to State Route 49, Route 4 was designated as LRN 75 from 1931-1934. Finally, the segment from State Route 49 to State Route 89 was signed as LRN 24 from 1909 to 1934.[2]

From 1998 to 2009, a road built by the State Route 4 Bypass Authority, named the State Route 4 Bypass, opened in three phases, bypassing Route 4 in Oakley and Brentwood to the south and west.[8][9] Many of the signs and local maps designated this extension as simply "Bypass Road." A section of Marsh Creek Road was widened to serve as the connection between the bypass built by the authority and the original Route 4 towards Stockton. In 2012, Caltrans handed over authority for State Route 4 in Oakley and Brentwood to the respective cities. In return, it gained control of the bypass and the upgraded section of Marsh Creek Road, which officially became State Route 4.[10]

Construction is currently underway on widening the freeway section of Route 4 through Pittsburg and Antioch, with the final configuration as three mixed use lanes and one High Occupancy Vehicle (HOV) lane in each direction and auxiliary lanes between interchanges as far as the interchange with Route 160. The median will accommodate an extension of the Bay Area Rapid Transit (BART) system. All work at the Loveridge Road and Somersville Road/Auto Center Drive interchanges has been completed; however, the HOV lane east of the Loveridge Road overpass remains closed pending completion of construction at the L Street/Contra Loma Boulevard and A Street/Lone Tree Way interchanges. Speed on the freeway through the Antioch portion of Route 4 is limited to 55 miles per hour (90 kph), as there is severe congestion, as well as areas where no shoulder exists due to temporary concrete barriers in place.

Only the portion of the bypass from California SR 160 to the Sand Creek Road interchange is a multi-lane freeway. The portion from Sand Creek Road to Vasco Road is single-lane each way and has signal-controlled grade crossings at Balfour Road and Marsh Creek Road. In May 2010, this narrow stretch of the road handled 27,000 to 30,000 vehicles per day.[11] In 2011, Caltrans awarded $25 million toward upgrading the section from Lone Tree Way to Sand Creek Road to a full freeway and constructing an interchange at Sand Creek Road.[12]

The freeway segment of Route 4 in Stockton is part of a proposed route to upgrade Route 99 into a future Interstate highway. Under one proposal, the new interstate would go along Route 99 from the split with I-5 at Wheeler Ridge north through Fresno to Stockton, where the proposed route would then turn west via the Route 4 freeway to a terminus at I-5.

Major intersections

This table reflects the transfer of the State Route 4 Bypass to Caltrans in 2012. Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).[13] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
County Location Postmile
Destinations Notes
Contra Costa
CC 0.00-48.39
Hercules 0.00 1A San Pablo Avenue At-grade intersection; former US 40; west end of SR 4
0.00 1B I‑80 (Eastshore Freeway) – Oakland, San Francisco, Sacramento No exit number eastbound
0.78 1C Willow Avenue Westbound exit and eastbound entrance
  R1.70 1 Sycamore Avenue Eastbound exit and entrance
    East end of freeway
  R1.70 Claeys Lane Interchange; westbound exit and entrance
  2.70 3 Franklin Canyon At-grade intersection eastbound; interchange westbound
    West end of freeway
  T4.89 5 Cummings Skyway to I-80 east – Crockett, Port Costa, Vallejo
  R5.17 6 McEwen Road – Port Costa Westbound exit and eastbound entrance
Martinez R8.55 9 Alhambra Avenue – Martinez
R9.19 10 Pine Street, Center Avenue
R10.33 11 Morello Avenue, Glacier Drive
12.41 12A Pacheco Boulevard – Pacheco Former SR 21
  12.67 12 I‑680 – Benicia, Sacramento, Walnut Creek, San Jose Signed as exits 12B (south) and 12C (north)
  R13.65 13 Solano Way
Concord R14.67 15A SR 242 – Concord, Oakland
R15.42 15B Port Chicago Highway
  R16.83 17 Willow Pass Road
  R18.83 19 San Marco Boulevard, Willow Pass Road – Bay Point
  R20.10 20 Bailey Road Signed as exits 20A (south) and 20B (north)
Pittsburg 23.05 23 Railroad Avenue, Harbor Street
24.32 24 Loveridge Road – Pittsburg
Antioch 26.01 26 Somersville Road, Auto Center Drive Signed as exits 26A (Somersville Road) and 26B (Auto Center Drive)
26.94 27A Contra Loma Boulevard, L Street Eastbound exit and westbound entrance
27.29 27B G Street – Central Antioch Closed; former eastbound exit and westbound entrance
R27.79 28 A Street, Lone Tree Way
R28.94 29 Hillcrest Avenue
31.13 30 SR 160 north – Rio Vista, Sacramento Eastbound exit and westbound entrance; former SR 4 east; west end of bypass
R31.50 31 Laurel Road
Brentwood R32.90 33 Lone Tree Way
  34 Sand Creek Road
  East end of freeway
  Balfour Road At-grade intersection; proposed interchange[18]
    Marsh Creek Road, Vasco Road – Concord, Livermore East end of bypass
    Walnut Boulevard – Brentwood, Livermore
  43.97 Byron Highway, Marsh Creek Road – Brentwood Byron Highway was former SR 4 west
Byron R44.37 CR J4 (Byron Highway) – Byron, Tracy
San Joaquin
SJ 0.00-38.06
  5.96 CR J2 (Tracy Boulevard) – Tracy
Stockton 15.91
25.36[N 1]
I‑5 south / Dr. Martin Luther King Jr. Boulevard – Tracy, San Francisco, Los Angeles, Angels Camp Interchange; west end of I-5 overlap; Dr. Martin Luther King Jr. Boulevard was former SR 4 east / Charter Way
  West end of freeway on I-5
26.19[N 1]
65B I‑5 north – Sacramento East end of I-5 overlap; no exit number eastbound
T15.32 Fresno Avenue Exit is on the left
R16.62 66A El Dorado Street, Center Street – Downtown Stockton Serves Stockton Arena and Ballpark; no exit number eastbound
R17.05 66B Stanislaus Street – Downtown Stockton Signed as exit 66 eastbound
R17.71 67 Wilson Way Former US 50 / US 99
R18.77 68A Filbert Street Signed as exit 68 westbound
18.68[N 2]
68B SR 99 north – Sacramento West end of SR 99 overlap; no exit number westbound
  18.15[N 2] 253 Main Street Westbound exit only
Stockton 18.02[N 2] 253 Dr. Martin Luther King Jr. Boulevard No westbound exit; former SR 26 west / Charter Way
    East end of freeway on SR 99
  17.22[N 2]
SR 99 south / Farmington Road – Fresno, Los Angeles, Stockton Interchange; east end of SR 99 overlap; Farmington Road was former SR 4 west
  24.87 CR J5 (Jack Tone Road) – Lockeford, Ripon
Farmington 33.10 CR J4 (Escalon-Bellota Road) – Escalon
STA 0.00-8.89
  4.54 CR J14 (Milton Road) – Milton, Eugene
CAL R0.00-R65.87
Copperopolis R8.14 CR E15 (O'Byrnes Ferry Road) / Rock Creek Road – Copperopolis
Angels Camp R21.09 SR 49 (Main Street, SR 4 Bus. east) – San Andreas, Sonora Former overlap with SR 4 east
SR 4 Bus. west (Vallecito Road) – Angels Camp, Sonora
Former SR 4 west
Vallecito 26.22 CR E18 (Parrots Ferry Road) – Moaning Cavern
ALP R0.00-31.68
  3.89 SR 207 (Mount Reba Road) – Bear Valley Ski Area
Bullion 31.68 SR 89 to US 395 – Markleeville, Monitor Pass East end of SR 4
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b Indicates that the postmile represents the distance along I-5 rather than SR 4.
  2. ^ a b c d Indicates that the postmile represents the distance along SR 99 rather than SR 4.

Angels Camp business route

State Route 4 Business
Location: Angels Camp, California
Existed: 2013–present

State Route 4 Business is a locally maintained business loop within the city of Angels Camp, California. It was established in August 2013 to attract customers to businesses along the parent route's former alignment, prior to the completion of the Angels Camp Bypass. It runs along South Main Street (co-signed with State Route 49), between State Route 4 and Vallecito Road, then turns east along Vallecito Road.[19][20]


  1. ^ "January 1, 2006 California Log of Bridges on State Highways". California Department of Transportation. Retrieved 2011-11-29.  Does not reflect the transfer of the State Route 4 Bypass to Caltrans in 2012.
  2. ^ a b c "California Highways: State Route 4". Retrieved 2011-11-29. 
  3. ^ "CA Codes (shc:250-257)". Retrieved 2011-11-29. 
  4. ^ "CA Codes (shc:260-284)". Retrieved 2011-11-29. 
  5. ^ California Department of Transportation, Officially Designated Scenic Highways, accessed 2009-09-14
  6. ^ 2007 Named Freeways, Highways, Structures and Other Appurtenances in California.  
  7. ^ Cabanatuan, Michael (1999-06-10). "Project to Straighten Out Part of Highway 4". San Francisco Chronicle. pp. A–17. Retrieved 2008-03-14. 
  8. ^ Faigin, Daniel. "State Route 4". California Highways. Retrieved 2012-11-12. 
  9. ^ "State Route 4 Bypass Authority". Retrieved 2011-11-12. 
  10. ^ Lafferty, Justin (January 26, 2012). "Brentwood, Oakley celebrate Highway 4 transfer". Brentwood Press. Retrieved February 2, 2012. 
  11. ^ Coetsee, Rowena (May 28, 2010). "Safety fears still dog East County roadway, but opinions differ over causes". San Jose Mercury News. 
  12. ^ Lafferty, Justin (September 29, 2011). "Savings lead to Bypass progress". Brentwood Press. Retrieved 2011-11-23. 
  13. ^ a b Staff. "State Truck Route List" ( 
  14. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  15. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  16. ^ California Department of Transportation, California Numbered Exit Uniform System, State Route 4 Freeway Interchanges, Retrieved on 2009-02-05.
  17. ^ California Department of Transportation, California Numbered Exit Uniform System, State Route 99 Freeway Interchanges, Retrieved on 2009-02-05.
  18. ^ State Route 4 Bypass Authority: Maps, accessed December 2007
  19. ^ Petesen, Tracey (15 August 2013). "Directing Traffic Downtown". My Mother Lode. Retrieved 4 January 2014. 

External links

  • California @ – State Route 4
  • Caltrans: Route 4 highway conditions
  • California Highways: Route 4
  • Ebbetts Pass Scenic Byway
  • Scenic 4 - Ebbetts Pass Scenic Byway
  • Cal-NExUS: Route 4
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