State Route 12 (California) - AbsoluteAstronomy.com

State Route 12 is a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

of California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

that travels in an east–west direction from Sebastopol

Sebastopol, California

Sebastopol is a city in Sonoma County, California, United States, approximately north of San Francisco. The population was 7,379 at the 2010 census, but its businesses also serve surrounding rural portions of Sonoma County, totaling about 50,000 people...

in Sonoma County

Sonoma County, California

Sonoma County, located on the northern coast of the U.S. state of California, is the largest and northernmost of the nine San Francisco Bay Area counties. Its population at the 2010 census was 483,878. Its largest city and county seat is Santa Rosa....

to State Route 49

California State Route 49

State Route 49 is a north–south state highway in the U.S. state of California that passes through many historic mining communities of the 1849 California gold rush. Highway 49 is numbered after the "49ers", the waves of immigrants who swept into the area looking for gold, and a portion of it...

just north of San Andreas

San Andreas, California

San Andreas is an unincorporated census-designated place and the county seat of Calaveras County, California. The population was 2,783 at the 2010 census, up from 2,615 at the 2000 census. Like most towns in the region, it was originally founded during the California Gold Rush...

in Calaveras County

Calaveras County, California

Calaveras County is a county located in the Gold Country of the U.S. state of California. Calaveras is the Spanish word for skulls; the county was reportedly named for the remains of Native Americans discovered by the Spanish explorer Captain Gabriel Moraga. As of the 2010 census, the county had a...

. It is constructed to freeway standards from the Fulton Road/South Wright Road stoplight in Santa Rosa

Santa Rosa, California

Santa Rosa is the county seat of Sonoma County, California, United States. The 2010 census reported a population of 167,815. Santa Rosa is the largest city in California's Wine Country and fifth largest city in the San Francisco Bay Area, after San Jose, San Francisco, Oakland, and Fremont and 26th...

, 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

California Freeway and Expressway System

The California Freeway and Expressway System is a system of existing or planned freeways and expressways in the U.S. state of California. It is defined by the Streets and Highways Code.-List of roads in the system:*State Route 1 *State Route 2...

and is eligible for the State Scenic Highway System

State Scenic Highway System (California)

The State Scenic Highway System is a list of highways, mainly state highways, that have been designated by the California Department of Transportation as scenic highways. The California State Legislature, primarily through Section 263 of the Streets and Highways Code, makes highways eligible for...

, however, it is only designated as a scenic highway from its intersecton with Danielli Avenue east of Santa Rosa

Santa Rosa, California

to its junction with London Way near Agua Caliente.

SR 12 has been designated by various state laws as the Luther Burbank Memorial Highway from Santa Rosa to Sebastopol (after botanist Luther Burbank

Luther Burbank

Luther Burbank was an American botanist, horticulturist and a pioneer in agricultural science.He developed more than 800 strains and varieties of plants over his 54-year career. Burbank's varied creations included fruits, flowers, grains, grasses, and vegetables...

).
SR 12 is also known as Sonoma Highway between Santa Rosa and the west side of the city of Sonoma

Sonoma, California

Sonoma is a historically significant city in Sonoma Valley, Sonoma County, California, USA, surrounding its historic town plaza, a remnant of the town's Mexican colonial past. It was the capital of the short-lived California Republic...

;
Broadway between Sonoma Plaza

Sonoma Plaza

Sonoma Plaza is the central plaza in the former El Pueblo de Sonoma, now known as Sonoma, California. The town is centered around this plaza, the largest plaza in California. This plaza is surrounded by many historical buildings, including the Mission San Francisco Solano, Captain Salvador...

and its junction with SR 121

California State Route 121

State Route 121 is a California state highway in the Wine Country that runs northerly from its junction with State Route 37 at Sears Point, past the Tolay Lake basin and across Tolay Creek near Infineon Raceway, veers east at a junction with State Route 116 and Bonneau Road at Schellville, runs...

in Schellville

Schellville, California

Schellville is an unincorporated community in Sonoma County, California, United States. Schellville is located at the junction of California State Route 12 and California State Route 121 south of Sonoma...

;
Carneros Highway from the 121 junction to where it splits from SR 29

California State Route 29

State Route 29 is a state highway in the U.S. state of California that travels in a north–south direction from State Route 20 in Upper Lake to Interstate 80 in Vallejo.-Route description:...

in American Canyon, California

American Canyon, California

American Canyon is a city located in southern Napa County, California, northeast of San Francisco. It is part of the San Francisco Bay Area. The 2010 census reported the city's population at 19,454. Its zip code is 94503, and its area code is 707...

;
Jameson Canyon Road from there to its junction with I-80

Interstate 80 in California

In the U.S. state of California, Interstate 80 , a major east–west route of the Interstate Highway System, has its western terminus in San Francisco, California, United States. From there it heads east across the Bay Bridge to Oakland, where it turns north and crosses the Carquinez Bridge...

;
and Rio Vista Highway from I-80 to SR 160

California State Route 160

State Route 160 is a state highway in the U.S. state of California consisting of two sections. The longer, southern, section is a scenic highway through the alluvial plain of the Sacramento River, linking SR 4 in Antioch with Sacramento via the Antioch Bridge...

east of Rio Vista

Rio Vista, California

Rio Vista is a city located in the eastern end of Solano County, California in the San Francisco Bay Area, on the Sacramento River, in the Sacramento River Delta region. The population was 7,360 at the 2010 census....

, and informally as "Blood Alley" from Lodi

Lodi, California

Lodi is a city located in , in the northern portion of California's Central Valley. The population was 62,134 at the 2010 census. The California Department of Finance's population estimate as of January 1, 2011 is 62,473....

to Fairfield

Fairfield, California

Fairfield is a city located in Solano County in Northern California, USA. It is generally considered the midpoint between the cities of San Francisco and Sacramento, approximately from the city center of both cities, approximately from the city center of Oakland, less than from Napa Valley, 18...

. The segment through Lodi to the overlap with SR 99 is on Kettleman Lane.

There are six segments that are overlaps

Concurrency (road)

A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other route numbers...

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

Fairfield, California

, 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.

SR 12 begins in the west at its junction with SR 116 in Sebastapol

Sebastopol, California

. 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

Jack London State Historic Park

Jack London State Historic Park, also known as Jack London Home and Ranch, is a California State Historic Park near Glen Ellen, California, United States, situated on the eastern slope of Sonoma Mountain...

at Glen Ellen

Glen Ellen, California

Glen Ellen is a census-designated place in Sonoma Valley, Sonoma County, California, USA. The population was 784 at the 2010 census, down from 992 at the 2000 census. Glen Ellen is the location of Jack London State Historic Park , Sonoma Valley Regional Park, and a former home of Hunter S....

. It winds through Sonoma on surface streets, where the historic Vallejo Estate

Vallejo Estate

The Vallejo Estate, also known as Lachryma Montis, is an historic Carpenter Gothic Victorian architecture style house and grounds located on the corner of West Spain Street and Third Street West in Sonoma, California...

and Sonoma Mission, both part of the Sonoma State Historic Park

Sonoma State Historic Park

Sonoma State Historic Park is a state park located in the center of Sonoma, California. The park consists of six sites in Sonoma: the Mission San Francisco Solano, the Presidio of Sonoma or Sonoma Barracks, the Toscano Hotel, the Blue Wing Inn, and La Casa Grande and Lachryma Montis, the homes of...

, are.

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

Napa River

The Napa River, approximately 55 miles long, is a river in the U.S. state of California. It drains a famous wine-growing region, called the Napa Valley, in the mountains northeast of San Francisco. Milliken Creek is a tributary of 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

Suisun City, California

Suisun City is a city in Solano County, California, United States. The population was 28,111 at the 2010 census. The city takes its name from the adjacent Suisun Bay, which in turn is named for the Suisunes, a Native American tribe of the area.-Geography:...

. East of Suisun it becomes two lanes again and crosses south of Travis Air Force Base

Travis Air Force Base

Travis Air Force Base is a United States Air Force air base under the operational control of the Air Mobility Command , located three miles east of the central business district of Fairfield, in Solano County, California, United States. The base is named for Brigadier General Robert F...

, through rolling fields with numerous wind turbines. Just past Braid's Bridge is the Western Railway Museum

Western Railway Museum

The Western Railway Museum, in Solano County, California is located on Highway 12 between Rio Vista and Suisun. The museum is built along the former mainline of theSacramento Northern Railway...

. At Rio Vista

Rio Vista, California

, SR 12 crosses the Helen Madere bridge over the Sacramento River

Sacramento River

The Sacramento River is an important watercourse of Northern and Central California in the United States. The largest river in California, it rises on the eastern slopes of the Klamath Mountains, and after a journey south of over , empties into Suisun Bay, an arm of the San Francisco Bay, and...

, entering the California Delta.

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

Humphrey the Whale

Humphrey the Whale is arguably the most widely publicized humpback whale in history, having errantly entered San Francisco Bay twice, departing from his Mexico to Alaska migration. This behavior is not normal for any Humpback whale, and Humphrey became well known on national television and press...

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

Sacramento, California

Sacramento is the capital city of the U.S. state of California and the county seat of Sacramento County. It is located at the confluence of the Sacramento River and the American River in the northern portion of California's expansive Central Valley. With a population of 466,488 at the 2010 census,...

.

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

Lodi, California

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

San Andreas, California

History

Before the 1964 renumbering, this route was signed as Sign Route 12 for most of its length. However, SR 12 was designated as LRN 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

California State Route 29

State Route 29 is a state highway in the U.S. state of California that travels in a north–south direction from State Route 20 in Upper Lake to Interstate 80 in Vallejo.-Route description:...

or with State Route 37

California State Route 37

State Route 37 is a state highway in the northern part of the U.S. state of California that runs 21 miles along the northern shore of San Pablo Bay. It is built from U.S. Route 101 in Novato and runs through the southern tips of Sonoma and Napa Counties to Interstate 80 in Vallejo...

; this was also LRN 8 and a former routing of U.S. 40

U.S. Route 40

U.S. Route 40 is an east–west United States highway. As with most routes whose numbers end in a zero, U.S. 40 once traversed the entire United States. It is one of the original 1920s U.S. Highways, and its first termini were San Francisco, California, and Atlantic City, New Jersey...

. The portion from I-80 to then-US 99

U.S. Route 99

U.S. Route 99 was the main north–south highway on the West Coast of the United States until 1964, running from Calexico, California, on the U.S.-Mexico border to Blaine, Washington, on the U.S.-Canada border. It was a route of the United States Numbered Highways, assigned in 1926 and existing...

was designated as LRN 53 in 1919; from US 99 to SR 49, it was designated as LRN 24.

In 1976, the discontinuity resulting from the concurrency with State Route 84

California State Route 84

State Route 84 is a split-section California State Highway consisting of two sections. The first section is an east–west arterial road running from San Gregorio to Menlo Park, across the Dumbarton Bridge through Fremont and Newark and ending at I-580 in Livermore. The route overlaps the...

was removed.

Future

Plans call for a western extension of its western terminus to State Route 1

California State Route 1

State Route 1 , more often called Highway 1, is a state highway that runs along much of the Pacific coast of the U.S. state of California. It is famous for running along some of the most beautiful coastlines in the world, leading to its designation as an All-American Road.Highway 1 does not run...

near Bodega Bay

Bodega Bay, California

Bodega Bay is a town and census-designated place in Sonoma County, California, United States. The population was 1,077 at the 2010 census. The town is on the eastern side of Bodega Harbor, an inlet of Bodega Bay on the Pacific coast....

. Plans also call for Route 12 to be built from Farmers Lane to Melita Road, however this project was delayed due to community opposition. There will be interchanges at Yulupa Avenue, Summerfield Road, Channel Drive and Sonoma Highway.

Major intersections

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

{| class=wikitable
|-
!County
!Location
!Postmile

!Exit

!Destinations
!Notes
|-
|rowspan=20|Sonoma

Sonoma County, California

SON 9.12-41.36
|rowspan=2|Sebastopol

Sebastopol, California

|9.12
|
|Bodega Avenue – Bodega Bay

Bodega Bay

Bodega Bay is a shallow, rocky inlet of the Pacific Ocean on the coast of northern California in the United States. It is approximately across and is located approximately northwest of San Francisco and west of Santa Rosa...

|Continuation beyond SR 116
|-
|9.12
|
|
|
|-
|rowspan=9|Santa Rosa

Santa Rosa, California

|R12.94
|
|Fulton Road, Wright Road
|
|-
| colspan="4" style="text-align:center;"|West end of freeway
|-
|R14.45
|5
|Stony Point Road
|
|-
|R15.30
|6
|Dutton Avenue
|
|-
|R16.04
|7A
|
|Signed as exits 7A (south) and 7B (north) westbound
|-
|R16.63
|7B
|South E Street – Downtown Santa Rosa
|Signed as exit 7C westbound
|-
| colspan="4" style="text-align:center;"|East end of freeway
|-
|T17.53
|
|Farmers Lane
|
|-
|20.10
|
|Calistoga Road – Calistoga

Calistoga, California

Calistoga is a city in Napa County, California, United States. The population was 5,155 at the 2010 census.-Geography:According to the United States Census Bureau, the city has a total area of , 99.30% of it land and 0.70% of it water.-Climate:...

|
|-
|Kenwood

Kenwood, California

Kenwood, California is an unincorporated town and census-designated place in Sonoma County, California, United States, located on Sonoma Highway between the cities Santa Rosa and Sonoma. It lies east of Sonoma Creek in the upper part of Sonoma Valley, a region sometimes called the Valley of the...

|27.03
|
|Warm Springs Road, Helmick Road – Kenwood

Kenwood, California

|
|-
|
|30.07
|
|Trinity Road – Oakville
|
|-
|
|30.65
|
|Arnold Drive – Glen Ellen

Glen Ellen, California

|
|-
|
|32.86
|
|Madrone Road – Eldridge

Eldridge, California

Eldridge is a census-designated place in Sonoma County, California, United States. The population was 1,233 at the 2010 census. It is notably the home to the Sonoma Developmental Center, the largest facility serving the needs of persons with developmental disabilities in the...

|
|-
|Agua Caliente

Fetters Hot Springs-Agua Caliente, California

Fetters Hot Springs-Agua Caliente is a census-designated place in Sonoma Valley, Sonoma County, California, in the United States. As of the 2010 census, the CDP population was 4,144....

Sonoma, California

|38.06
|
|MacArthur Street
|
|-
|38.69
|
|Napa Road, Leveroni Road – Sonoma

Sonoma, California

|
|-
|Schellville

Schellville, California

| style="background:#dfd;"|41.36
7.44Indicates that the postmile represents the distance along SR 121

California State Route 121

Napa County, California

Napa County is a county located north of the San Francisco Bay Area in the U.S. state of California. It is coterminous with the Napa, California, Metropolitan Statistical Area. As of 2010 the population is 136,484. The county seat is Napa....

NAP 0.00-3.31
|Napa

Napa, California

-History:The name Napa was probably derived from the name given to a southern Nappan village whose people shared the area with elk, deer, grizzlies and cougars for many centuries, according to Napa historian Kami Santiago. At the time of the first recorded exploration into Napa Valley in 1823, the...

| style="background:#dfd;"|R4.47
R8.66Indicates that the postmile represents the distance along SR 29

California State Route 29

State Route 29 is a state highway in the U.S. state of California that travels in a north–south direction from State Route 20 in Upper Lake to Interstate 80 in Vallejo.-Route description:...

Napa County Airport

Napa County Airport , also known as Napa Valley Airport, is a public airport located five miles south of Napa, in Napa County, California, USA. It has three runways....

Solano County, California

Solano County is a county located in Bay-Delta region of the U.S. state of California, about halfway between San Francisco and Sacramento and is one of the nine San Francisco Bay Area counties. The county's population was reported by the U.S. Census to be 413,344 in 2010...

SOL 0.00-26.41
|rowspan=9|Fairfield

Fairfield, California

| style="background:#dfd;"|R2.79
R11.98Indicates that the postmile represents the distance along I-80

Interstate 80 in California

rather than SR 12.
| style="background:#dfd;"|
| style="background:#dfd;"|
| style="background:#dfd;"|West end of I-80 overlap; westbound exit and eastbound entrance; eastbound access is via Red Top Road
|-
| colspan="5" style="text-align:center;"|West end of freeway on I-80
|-
|12.74
|40
|Green Valley Road
|Westbound exit is part of exit 41
|-
|12.84
|40
|
|
|-
|13.49
|41
|Suisun Valley Road, Pittman Road
|
|- style="background:#dfd;"
|15.82
L1.80
|
|
|East end of I-80 overlap; eastbound exit and westbound entrance
|-
|L2.22
|56
|

Chadbourne Road to I-80

Interstate 80 in California

east – Fairfield Auto Mall, Sacramento

Sacramento, California

|
|-
| colspan="4" style="text-align:center;"|East end of freeway
|-
|R4.07
|
|Pennsylvania Avenue
|
|-
|rowspan=4|Suisun City

Suisun City, California

|R4.47
|58A
|Webster Street, Jackson Street – Fairfield

Fairfield, California

|Interchange
|-
|R4.57
|58B
|Main Street – Suisun City Business District
|Interchange
|-
|5.76
|
|Sunset Avenue, Grizzly Island Road
|
|-
|
|
|Walters Road, Lawler Ranch Parkway – Travis AFB

Travis Air Force Base

|
|-
|
|19.17
|
|
|
|-
|Rio Vista

Rio Vista, California

Sacramento County, California

Sacramento County is a county in the U.S. state of California. Its county seat is Sacramento, which is also the state capital. As of 2010 the county had a population of 1,418,788....

SAC 0.00-6.20
|
|0.57
|
|
|
|-
|
|5.64
|
|Terminous Road – Isleton

Isleton, California

Isleton is a city in Sacramento County, California, United States. The population was 804 at the 2010 census, down from 828 at the 2000 census. It is located on Andrus Island amid the slough wetlands of the Sacramento-San Joaquin River Delta, on the eastern edge of the Rio Vista Gas Field.The city...

|
|-
|rowspan=12|San Joaquin

San Joaquin County, California

San Joaquin County is a county located in Central Valley of the U.S. state of California, just east of the San Francisco Bay Area. As of the 2010 census, the population was 685,306. The county seat is Stockton.-History:...

SJ 0.00-27.64
|
|10.17
|
|
|Interchange
|-
|
|10.30
|
|
|
|-
|rowspan=7|Lodi

Lodi, California

|15.16
|
|
|
|-
|16.93
|
|
|
|-
|17.95
|
| – Central District

Lodi, California

|Former US 50

U.S. Route 50 in California

In the U.S. state of California, U.S. Route 50 runs east from I-80 in West Sacramento to the Nevada state line in South Lake Tahoe. Portions within Sacramento are known as the Capital City Freeway and El Dorado Freeway...

/ US 99
|- style="background:#dfd;"
|18.07
29.50Indicates that the postmile represents the distance along SR 99

California State Route 99

California State Route 99 , commonly known as Highway 99 or, simply, as 99 , is a north–south state highway in the U.S. state of California, stretching almost the entire length of the Central Valley...

California State Route 88

State Route 88 , also known as the Carson Pass Highway, is a California State Highway that travels in an east–west direction, from Stockton, crossing the Sierra Nevada at Carson Pass, and ending at the border with Nevada, whereupon it becomes Nevada State Route 88, eventually terminating at U.S...

Lockeford, California

Lockeford is a census-designated place in San Joaquin County, California, United States. The population was 3,233 at the 2010 census, up from 3,179 at the 2000 census.-Geography:Lockeford is located at ....

|14.08
|
|
|
|-
|Clements

Clements, California

Clements is an unincorporated community in San Joaquin County, California, United States. Clements is located on California State Route 12 and California State Route 88 east-northeast of Lodi. Clements has a post office with ZIP code 95227, which was established in 1882. The community is named...

Calaveras County, California

CAL 0.00-18.20
|Valley Springs

Valley Springs, California

Valley Springs is a census-designated place in Calaveras County, California, United States. The population was 3,553 at the 2010 census, up from 2,560 at the 2000 census. The town is located at the intersection of State Route 12 and Route 26...

External links

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