California State Route 23
Route information | ||||
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Maintained by Caltrans | ||||
Length | 32.030 mi[1] (51.547 km) SR 23 is broken into pieces, and the length does not reflect the US 101 and SR 118 overlaps that would be required to make the route continuous. | |||
Major junctions | ||||
South end | SR 1 in Malibu | |||
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North end | SR 126 / A St in Fillmore | |||
Location | ||||
Country | United States | |||
State | California | |||
Counties | Los Angeles, Ventura | |||
Highway system | ||||
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State Route 23 (SR 23) is a state highway in the U.S. state of California that connects the Pacific coast and the Santa Monica Mountains to the Conejo and Santa Clara River valleys. It runs from Pacific Coast Highway (State Route 1) in Malibu in Los Angeles County to Ventura Street (State Route 126) in Fillmore in Ventura County.
Route description
SR 23 consists of three distinct sections. The southern section begins as Decker Canyon Road near Trancas in
The middle section is a major route for traffic headed between Thousand Oaks and
The northernmost section begins at
On SR 23 from Tierra Rejada Road to Olsen Road (and vice versa) is a bike lane. After crossing Tierra Rejada Road (going north) and Olsen Road (going south), bicyclists are prohibited from crossing.
SR 23 is part of the
History
State Route 23 has been designated as such since 1934. However, at this time it was also designated as Legislative Route 155. The freeway portion of SR 23 opened in several phases between 1971 and 1994.[6] Before then, SR 23 ran along Moorpark Road and intersected with U.S. 101 near Newbury Park, although it still ran concurrently with U.S. 101, which was then an expressway.[7]
SR 23 was designated as part of the Freeway and Expressway System in 1959.[6]
Decker Freeway
The Decker Freeway was an unbuilt north–south freeway that would connect SR 118, US 101, and SR 1. The freeway was part of a 1958 plan by the Metropolitan Engineering Board,[8][9] but was later considered to be geographically improbable and the plans were abandoned.
The freeway's southern portion, from SR 1 to US 101, follows the general alignment of Decker Canyon Road and Westlake Boulevard, a segment of SR 23. It would continue north before terminating at SR 118 near First Street.[8]
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 to an overlap due to a correction or change, and T indicates postmiles classified as temporary ( ).[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][10][11] | Exit [12] | Destinations | Notes |
---|---|---|---|---|---|
Pacific Coast Highway) – Oxnard, Santa Monica | South end of SR 23 | ||||
Ventura VEN 0.00-24.17 | Thousand Oaks | T1.49 | Portrero Road – Lake Sherwood, Hidden Valley | ||
R3.32 0.70 Los Angeles Interchange; south end of US 101 overlap; US 101 exit 40 | | ||||
South end of freeway on US 101 | |||||
1.62[N 1] | 41 | Hampshire Road | |||
3.11[N 1] R3.34 | 12B | US 101 north (Ventura Freeway) – Ventura | North end of US 101 overlap; SR 23 north follows US 101 north exit 43A, south exit 43B | ||
R3.70 | 13 | Hillcrest Drive, Thousand Oaks Boulevard – Thousand Oaks | Southbound exit and northbound entrance | ||
R5.06 | 14 | Janss Road | |||
R6.03 | 15 | Avenida de los Arboles | |||
R7.17 | 16 | Sunset Hills Boulevard | |||
R8.21 | 17 | Olsen Road – Simi Valley | |||
Moorpark | R10.16 | 19 | Tierra Rejada Road | ||
North end of freeway | |||||
R11.43 T18.21 Los Angeles Interchange; south end of SR 118 overlap; SR 23 north/SR 118 west follows SR 23 exit 20A and SR 118 exit 18B; SR 23 south follows SR 118 west exit 18A | | ||||
R17.49 At-grade intersection ; north end of SR 118 overlap; SR 23 north follows Moorpark Avenue north, SR 118 west follows Los Angeles Avenue west | |||||
Fillmore | 24.17 | SR 126 (Ventura Street) – Santa Clarita, Santa Paula, Ventura | North end of SR 23 | ||
24.17 | A Street | Continuation beyond SR 126 | |||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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See also
- California Roads portal
References
- ^ a b c California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
- ^ "Article 2 of Chapter 2 of Division 1 of the California Streets & Highways Code". California Office of Legislative Counsel. Retrieved January 21, 2019.
- ^ Federal Highway Administration (March 25, 2015). National Highway System: Los Angeles, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 19, 2017.
- ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
- ^ California Department of Transportation; California State Transportation Agency (January 2021). 2020 Named Freeways, Highways, Structures and Other Appurtenances in California (PDF). Sacramento: California Department of Transportation. pp. 28, 307. Archived from the original (PDF) on October 10, 2022.
- ^ a b "California Highways: Routes 017-024 to Individual Page Detour". www.cahighways.org.
- ^ Shell California (Map). Cartography by The H.M. Gousha Company. Shell Oil Company. 1965. § R3.
- ^ a b 1958 map cahighways.org
- ^ "California Highways (www.cahighways.org): Telling a Story through Highway and Planning Maps: Southern California Freeway Development (Part 2 - 1950s)". www.cahighways.org.
- ^ California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- California Numbered Exit Uniform System, State Route 23 Freeway Interchanges, U.S. Route 101 Freeway Interchanges, Retrieved on 2009-02-05.