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California State Route 12

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Title: California State Route 12  
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Subject: California State Route 221, Interstate 680 (California), List of state highways in California, Interstate 80 in California, List of crossings of the Sacramento River
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California State Route 12

State Route 12 marker

State Route 12
Route information
Defined by S&HC § 312
Maintained by Caltrans
Length: 140.64 mi[1] (226.34 km)
Existed: 1934[2] – present
Major junctions
West end: SR 116 in Sebastopol
  US 101 in Santa Rosa
SR 29 / SR 121 near Napa
I‑80 near Fairfield
I‑680 near Fairfield
SR 160 in Rio Vista
I‑5 in Lodi
SR 99 in Lodi
SR 88 near Lodi
East end: SR 49 near San Andreas
Highway system
SR 11 SR 13
SR 12 in Sonoma (Broadway)

State Route 12 (SR 12) is a state highway in the U.S. state of California that travels in an east–west direction from Sebastopol in Sonoma County to State Route 49 just north of San Andreas in Calaveras County. It is constructed to freeway standards from the Fulton Road/South Wright Road stoplight in Santa Rosa, to its partial interchange with Farmers Lane (also in Santa Rosa).

Route description

State Route 12 is part of the California Freeway and Expressway System[3] and is eligible for the State Scenic Highway System,[4] however, it is only designated as a scenic highway from its intersection with Danielli Avenue east of Santa Rosa to its junction with London Way near Agua Caliente.[5]

SR 12 has been designated by various state laws and through local usage as the Valley of the Moon Scenic Route (the portion running through Sonoma County, though the first sign with this name is at the intersection of Farmers Lane and Fourth Street in Santa Rosa);[6] Luther Burbank Memorial Highway from Santa Rosa to Sebastopol (after botanist Luther Burbank).[7] SR 12 is also known as Sonoma Highway between Santa Rosa and the west side of the city of Sonoma; Broadway between Sonoma Plaza and its junction with SR 121 in Schellville; Carneros Highway for the length of its concurrency with 121 between Schellville and its junction and the north end of its concurrency with SR 29 near Napa;[8] Jameson Canyon Road from where its concurrency with SR 29 ends in American Canyon to its junction with I-80 in Cordelia; and Rio Vista Highway from I-80 to SR 160 east of Rio Vista,[9][10] and informally as "Blood Alley" from Lodi to Fairfield.[11] The segment through Lodi to the overlap with SR 99 is on Kettleman Lane.[12]

There are six segments that are overlaps with other highways: in the Napa and Sonoma valleys with SR 121, in the southern Napa Valley with SR 29, a short overlap with I-80 at Cordelia Junction in Fairfield, another short overlap with SR 99 in Lodi, and overlaps with SR 88 and SR 26 in the Sierra foothills. The highway is mainly two lane rural highway, with the exception of short segments in Santa Rosa and Fairfield/Suisun City, the overlaps with I-80 and SR 99, and segments within developed areas, such as Santa Rosa and Lodi.[12][13]

SR 12 begins in the west at its junction with SR 116 in Sebastopol. After passing east through Santa Rosa on a mix of freeway, surface street, and expressway, it turns south into the Sonoma Valley, passing the Jack London State Historic Park at Glen Ellen. It winds through Sonoma on surface streets, where the historic Vallejo Estate and Sonoma Mission, both part of the Sonoma State Historic Park, are.[12][13]

South of Sonoma, SR 12 turns east, joining SR 121 for nearly nine miles, then turns south briefly as it leaves SR 121 and joins the four-lane expressway SR 29 to cross the Napa River. Four miles after joining SR 29 it splits off towards the east on Jameson Canyon Road. After a brief merge with Interstate 80, SR 12 branches off to the east as an expressway through Fairfield and Suisun City. East of Suisun it becomes two lanes again and crosses south of Travis Air Force Base, through rolling fields with numerous wind turbines. Just past Braid's Bridge is the Western Railway Museum. At Rio Vista, SR 12 crosses the Helen Madere bridge over the Sacramento River, entering the California Delta.[12][13]

This stretch of the river has twice been the site of much-publicized inland excursions by humpback whales, presumably veering off course while making their annual migrations along the Pacific coast. In 1985 Humphrey the whale swam about as far as the Rio Vista Bridge. In 2007 a humpback mother and calf dubbed Delta and Dawn circled for several days just upstream of the bridge, seemingly reluctant to pass under it again after having spent the previous three or four weeks upriver near Sacramento.

From the Sacramento River to the junction with Interstate 5, SR 12 crosses several of the waterways of the California Delta and the low lying fields between them. Through Lodi it becomes a wide four lane business route. After another brief merger with another freeway, this time SR 99, SR 12 heads east into the Sierra foothills (with shared segments with SR 88 and SR 26) before ending at the junction with SR 49 just north of San Andreas.[12][13]


Route 12 between Lodi and Jackson

Before the 1964 renumbering, this route was signed as Sign Route 12 for most of its length. However, SR 12 was designated as Legislative Route 51 (LR 51) from SR 116 to SR 121 before the 1964 renumbering. Portions of the route from SR 29 to I-80 ran concurrently with State Route 29 or with State Route 37; this was also LR 8 and a former routing of US 40. The portion from I-80 to then-US 99 was designated as LR 53 in 1919; from US 99 to SR 49, it was designated as LR 24.[14]

In 1976, the discontinuity resulting from the concurrency with State Route 84 was removed.[14]


Plans call for a western extension of its western terminus to State Route 1 near Bodega Bay.[15] Plans also call for Route 12 to be built from Farmers Lane to Melita Road, in Santa Rosa, however this project was delayed due to community opposition.

Major intersections

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).[16] 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
SON 9.12-41.36
Sebastopol 9.12 Bodega Avenue – Bodega Bay Continuation beyond SR 116
9.12 SR 116 (Petaluma Avenue, Main Street) – San Francisco, Jenner West end of SR 12
Santa Rosa R12.94 Fulton Road, Wright Road
  West end of freeway
R14.45 5 Stony Point Road
R15.30 6 Dutton Avenue
R16.04 7A US 101 – San Francisco, Eureka Signed as exits 7A (south) and 7B (north) westbound
R16.63 7B South E Street – Downtown Santa Rosa Signed as exit 7C westbound
  East end of freeway
T17.53 Farmers Lane
20.10 Calistoga Road – Calistoga
Kenwood 27.03 Warm Springs Road, Helmick Road – Kenwood
  30.07 Trinity Road – Oakville
  30.65 Arnold Drive – Glen Ellen
  32.86 Madrone Road – Eldridge
Agua Caliente 34.25 Agua Caliente Road
Sonoma 38.06 MacArthur Street
38.69 Napa Road, Leveroni Road – Sonoma
Schellville 41.36
7.44[N 1]
SR 121 south (Fremont Drive) – Petaluma, San Francisco West end of SR 121 overlap
  R10.79[N 1] Napa Road
NAP 0.00-3.31
Napa R4.47[N 1]
R8.66[N 2]
SR 29 north / SR 121 north – Napa, Calistoga East end of SR 121 overlap; west end of SR 29 overlap
  R6.20[N 2] SR 221 / Soscol Ferry Road – Downtown Napa, Lake Berryessa
0.00[N 2]
SR 29 south / Airport Boulevard – Vallejo, Napa County Airport East end of SR 29 overlap
SOL 0.00-26.41
Fairfield R2.79
R11.98[N 3]
I‑80 west – San Francisco West end of I-80 overlap; westbound exit and eastbound entrance; eastbound access is via Red Top Road
  West end of freeway on I-80
12.74[N 3] 40 Green Valley Road Westbound exit is part of exit 41
12.84[N 3] 40 I‑680 south – Benicia, Martinez, San Jose
13.49[N 3] 41 Suisun Valley Road, Pittman Road
15.82[N 3]
I‑80 east – Sacramento East end of I-80 overlap; eastbound exit and westbound entrance
L2.22 56 Chadbourne Road to I-80 east – Fairfield Auto Mall, Sacramento
  East end of freeway
R4.07 Pennsylvania Avenue
Suisun City R4.47 58A Webster Street, Jackson Street – Fairfield Interchange
R4.57 58B Main Street – Suisun City Business District Interchange
5.76 Sunset Avenue, Grizzly Island Road
  19.17 SR 113 north / Birds Landing Road – Dixon, Birds Landing, Collinsville
Rio Vista 26.28 SR 84 / Front Street – Rio Vista, Ryer Island Interchange
SAC 0.00-6.20
  0.57 SR 160 (River Road) – Isleton, Sacramento, Antioch
  5.64 Terminous Road – Isleton
San Joaquin
SJ 0.00-27.64
  10.17 I‑5 – Sacramento, Stockton, Los Angeles Interchange
  10.30 CR J8 (Thornton Road) / Star Street
Lodi 15.16 CR J10 (Lower Sacramento Road)
16.93 CR J3 (Hutchins Street)
SR 99 Bus. (Cherokee Lane) – Central District
Former US 50 / US 99
29.50[N 4]
SR 99 south / Kettleman Lane – Fresno, Los Angeles Interchange; west end of SR 99 overlap
  West end of freeway on SR 99
  East end of freeway on SR 99
30.97[N 4]
SR 99 north / Victor Road – Sacramento, Central Lodi Interchange; east end of SR 99 overlap
L12.24[N 5]
SR 88 west / Victor Road – Stockton West end of SR 88 overlap
Lockeford 14.08[N 5] CR J5 (Elliott Road, Tully Road)
Clements 19.17[N 5]
SR 88 east – Ione, Jackson, Lake Tahoe East end of SR 88 overlap
CAL 0.00-18.20
Valley Springs 9.93 SR 26 west / Laurel Street – Linden West end of SR 26 overlap
  13.87 SR 26 east / Toyon Circle – Mokelumne Hill East end of SR 26 overlap
  18.20 SR 49 – Mokelumne Hill, San Andreas East end of SR 12
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b c Indicates that the postmile represents the distance along SR 121 rather than SR 12.
  2. ^ a b c Indicates that the postmile represents the distance along SR 29 rather than SR 12.
  3. ^ a b c d e Indicates that the postmile represents the distance along I-80 rather than SR 12.
  4. ^ a b Indicates that the postmile represents the distance along SR 99 rather than SR 12.
  5. ^ a b c Indicates that the postmile represents the distance along SR 88 rather than SR 12.


  1. ^ "January 1, 2006 California Log of Bridges on State Highways". Retrieved 2011-11-28. 
  2. ^ "California Highways: State Route 12". Retrieved 2011-11-28. 
  3. ^ "CA Codes (shc:250-257)". Retrieved 2011-11-28. 
  4. ^ "CA Codes (shc:260-284)". Retrieved 2011-11-28. 
  5. ^ California Department of Transportation, Officially Designated Scenic Highways, accessed 2010-01-03
  6. ^
  7. ^ 2007 Named Freeways, Highways, Structures and Other Appurtenances in California.  
  8. ^
  9. ^ California Highway Patrol: CADWEB Name from CHP traffic reports. Archived on Google cache on 2007-09-24. Accessed on 2007-10-01.
  10. ^ Google Inc. "map of Route 12 showing Rio Vista Highway name from I-80 to SR 160". Google Maps (Map). Cartography by Google, Inc.,-121.79881&sspn=0.181078,0.32135&ie=UTF8&ll=38.224156,-121.882324&spn=0.361953,0.6427&z=11&om=1. Retrieved 2007-10-01.
  11. ^ Deaths on Highway 12. San Joaquin Record All Eyes on Blood Alley. Accessed on 2008-05-12. 
  12. ^ a b c d e California State Automobile Association map Gold Country, 7-05 edition
  13. ^ a b c d California State Automobile Association map San Francisco Bay, 1-09 edition
  14. ^ a b "California Highways ( Routes 9 through 16". Retrieved 2011-11-28. 
  15. ^ Democrat: County OKs bypass around Forestville, accessed 2010-06-15
  16. ^ a b Staff. "State Truck Route List" ( 
  17. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  18. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  19. ^ California Department of Transportation, California Numbered Exit Uniform System, State Route 12 Freeway Interchanges, Interstate 80 Freeway Interchanges, Retrieved on 2009-02-05.

External links

  • California @ – State Route 12
  • Caltrans: Route 12 highway conditions
  • California Highways: Route 12
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