 State Route 46 | ||||
|---|---|---|---|---|
 SR 46 highlighted in red | ||||
| Route information | ||||
| Maintained byCaltrans | ||||
| Length | 110.696 mi[1] (178.148 km) SR 46 is broken into pieces, and the length does not reflect the US 101 overlap that would be required to make the route continuous. | |||
| History | State highway in 1916; numbered in 1964 | |||
| Major junctions | ||||
| West end |  SR 1 nearCambria | |||
| Major intersections |
| |||
| East end |  SR 99 atFamoso | |||
| Location | ||||
| Country | United States | |||
| State | California | |||
| Counties | San Luis Obispo,Kern | |||
| Highway system | ||||
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State Route 46 (SR 46) is an east–weststate highway in theU.S. state ofCalifornia. It is a major crossing of theCoast Ranges and it is the southernmost crossing of theDiablo Range, connectingSR 1 on theCentral Coast nearCambria andUS 101 inPaso Robles withSR 99 atFamoso in theSan Joaquin Valley.
The road that is now SR 46 was built and improved during the 1920s and was fully paved by 1930. The majority of SR 46 was originally designated asU.S. Route 466; however, after the latter was entirely removed from theU.S. Highway system, the eastern portion of the route became SR 46.
State Route 46 begins atSR 1 southeast of Cambria, about one mile (1.6 km) from thePacific Ocean. It heads east as theEric Seastrand Highway across theSanta Lucia Range on a relatively straight roadway built in the 1970s, bypassing the steep, curvy Santa Rosa Creek Road. After passing near several wineries, this first segment ends at US 101 north ofTempleton, where SR 46 turns north,overlapping the US 101freeway through the valley formed by theSalinas River to central Paso Robles. Immediately after splitting from US 101, SR 46 crosses the Salinas River, passing near thePaso Robles Municipal Airport, and then heads east through a hilly area with several wineries and the community ofWhitley Gardens. It then runs partially alongside theEstrella River to a merge with SR 41 nearShandon and arest area. There, it turns northeast, followingCholame Creek throughCholame Pass between theCholame Hills andTemblor Range to the settlement ofCholame and the split with SR 41. After crossing intoKern County, the highway continues to rise as it heads east up the Antelope Grade to a summit nearBluestone Ridge before descending throughPolonio Pass into theSan Joaquin Valley. State Route 46 takes the southernmost crossing of theDiablo Range, which is one of the routes linking the Central Valley to the coast.Interstate 580,State Route 152, and State Route 46 are the major routes that cross theDiablo Range. This route is heavily used whenthe Grapevine is closed. Truckers who do not want to take SR 58 throughTehachapi can use this route to head to I-5 to theBay Area, Northern California, and vice versa. Many people from the Bay Area also use this route to head toTehachapi Pass to head toInterstate 40, theAntelope Valley, Las Vegas, andMount Whitney if they do not want to use I-5.[2][3]
Once it enters the San Joaquin Valley, SR 46, known as the Paso Robles Highway, follows an almost perfectly straight eastward alignment, crossingSR 33 atBlackwells Corner, passing through theLost Hills Oil Field, and intersectingI-5 about two miles (3.2 km) pastLost Hills and the crossing of theCalifornia Aqueduct. SR 46 then passes through theSemitropic Oil Field about seven miles (11 km) west ofWasco. SR 46 andSR 43overlap for a short distance in the city of Wasco, and then SR 46 passes overCalloway Canal and Friant Canal before it ends atSR 99 in Famoso. The county-maintained Famoso Road continues east acrossSR 65 and into theSierra Nevada foothills.[2][3]
East of Paso Robles, SR 46 is part of theCalifornia Freeway and Expressway System,[4] and east of US 101 is part of theNational Highway System,[5] a network of highways that are considered essential to the country's economy, defense, and mobility by theFederal Highway Administration.[6] The highway from SR 1 toSR 41 nearCholame is an eligibleState Scenic Highway,[7] but it is not officially designated as a scenic highway by theCalifornia Department of Transportation.[8]
As part of the second state highwaybond issue, approved by the state's voters in 1916,Route 33 was created, linking theSan Joaquin Valley trunk (Route 4, now SR 99) nearBakersfield with the coast trunk (Route 2, now US 101 in Paso Robles, passing through theCoast Ranges viaCholame Pass.[9][10] The road was not yet built in 1919 when theAutomobile Blue Book recommended only the county-maintained "very poor road" (nowSR 58) viaSimmler as a connection between the valley andCentral Coast.[11] By 1925, the Cholame Pass highway had been improved,[12] andpaving was completed in December 1930.[13] An extension west toRoute 56 (now SR 1) nearCambria was added in 1933;[14][15] however, it ran along Santa Rosa Creek Road, north of today's alignment.[16]
The state sign route system was established in 1934 but the majority of Route 33 did not receive a state route designation, instead becoming part of the new U.S. Route 466. However, US 466 turned southwest from Cholame Pass alongLegislative Route 125 (modern SR 41) toMorro Bay. Sign Route 41, which followed Legislative Route 125 northeast of Cholame, continued along Route 33 west to the coast.[17][18][19][20] However, Route 125 had still not been paved between Cholame andAtascadero by the 1950s and so US 466 was moved to the longer but better-quality Route 33 via Paso Robles, replacing SR 41 to Paso Robles andoverlapping US 101 to Atascadero. As SR 41 had not been signed over the unpaved road west of Paso Robles, it was truncated to Cholame.[21] US 466 was eliminated in the1964 renumbering, becoming SR 46 east from Paso Robles. However, instead of going south and west to Morro Bay, SR 46 continued west to Cambria and the road via Creston and Atascadero to Morro Bay (which had since been paved) became part of SR 41.[22][23] A new two-laneexpressway carrying SR 46 west from Paso Robles[24] was built in the mid-1970s, replacing Santa Rosa Creek Road.[16]
The two-lane stretch from Paso Robles to Cholame was known as "Blood Alley" for the large number ofvehicle incidents, mainlyhead-on collisions, among the high volume of commuters, truck drivers and tourists.[25] Between 1994 and 1999, there were 206 accidents along the corridor, resulting in 17 deaths,[26] and another 38 deaths between 2000 and 2010.[27] The intersection between SR 46 and SR 41, known locally asthe Wye, was more accident-prone than the statewide average.[26] The California State Legislature dedicated that intersection as theJames Dean Memorial Junction on September 30, 2005, for the 50th anniversary of the actor's death in a car crash near that site.[28][29] TheCalifornia Department of Transportation (Caltrans) carried out an interim safety project west of Cholame in December 1995, mandatingdaytime headlights and installingthermoplastic striping, a concrete barrier andrumble strips.[30][31] In 2006, Caltrans identified SR 46 as a "critical east-west corridor connecting the Central Coast and Central Valley areas of California", in anenvironmental impact statement that approved the road's expansion. In 2010, the first stretch of newly widened road opened in Paso Robles, utilizing funds from a2006 statewide ballot proposition. A series of additional projects and progressed eastward over the next decade.[26][32][33]
In March 2022, construction began on the section near Cholame that led to the Wye. On April 25, 2023, workers broke ground on constructing a new grade-separated interchange at the James Dean Memorial Junction, which is scheduled to be completed in 2026. The 3.6 mi (5.8 km) portion of SR 46 leading to Kern County, known as the Antelope Grade Section, is scheduled to begin construction in 2026.[33][34][35]
Except where prefixed with a letter,postmiles were measured on the road as it was in1964, 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 to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, seeCalifornia postmile § Official postmile definitions).[1] 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 [1][16][36] | Exit [37] | Destinations | Notes |
|---|---|---|---|---|---|
| San Luis Obispo SLO R0.15-60.85 | | R0.15 | SR 1 –Cambria,Hearst Castle,Harmony,Cayucos,Morro Bay | West end of SR 46 | |
| Paso Robles | R21.97 54.12[N 1] |   US 101 south / Ramada Drive | Interchange; west end of US 101 overlap; US 101 exit 228 | ||
| West end of freeway on US 101 | |||||
| 55.67[N 1] | 229 | Spring Street (US 101 Bus. north) | Eastbound exit and westbound entrance | ||
| | 230 | Pine Street | Westbound exit and entrance | ||
| | 230 | Paso Robles Street | Eastbound exit only | ||
| 56.88[N 1] | 231A | 16th Street | Westbound exit and eastbound entrance | ||
| 57.92[N 1] 29.76 | East end of freeway on US 101 | ||||
  US 101 north /CR G14 (24th Street) –Paso Robles | Interchange; east end of US 101 overlap; US 101 north exit 231, south exit 231B | ||||
| Shandon | 48.63 |   SR 41 south (West Centre Street) / McMillan Canyon Road –Shandon,Creston | West end of SR 41 overlap; formerUS 466 west; also accessible westbound via a left turn at East Centre Street | ||
| | 49.60 | Shandon Rest Area | |||
| Cholame | 55.11 |  SR 41 north –Fresno | East end of SR 41 overlap | ||
| Kern KER 0.00-57.79 | | | Polonio Pass | ||
| Blackwells Corner | 20.54 |  SR 33 –Coalinga,McKittrick,Taft | |||
| | 27.48 | Brown Material Road, Halloway Road | |||
| Lost Hills | 32.53 |  I-5 (West Side Freeway) –Sacramento,Los Angeles | Interchange; I-5 exit 278 | ||
| | 43.02 | Rowlee Road –Buttonwillow | |||
| Wasco | 50.90 |    SR 43 south (F Street) toI-5 south –Shafter,Central District | West end of SR 43 overlap | ||
| 51.22 | SR 43 north / J Street –Corcoran | East end of SR 43 overlap | |||
| Famoso | 57.78 | SR 99 –Delano,Bakersfield | Interchange; east end of SR 46; formerUS 99 /US 466 east; SR 99 exit 44 | ||
| 57.78 | Famoso Road –Famoso | Continuation beyond SR 99 | |||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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