# California State Route 242 > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/California_State_Route_242 > Markdown URL: https://mediated.wiki/source/California_State_Route_242.md > Source: https://en.wikipedia.org/wiki/California_State_Route_242 > Source revision: 1327542530 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) Highway in California State Route 242 SR 242 highlighted in red Route information Maintained by Caltrans Length 3.398 mi[1] (5.469 km) Existed 1987–present Major junctions South end I-680 at the Pleasant Hill–Concord border North end SR 4 in Concord Location Country United States State California Counties Contra Costa Highway system State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways ← SR 241 → SR 243 **State Route 242** (**SR 242**) is an approximately 3.4-mile (5.5 km) [state highway](/source/State_highway) in [Contra Costa County, California](/source/Contra_Costa_County%2C_California) that links [Interstate 680](/source/Interstate_680_(California)) at the [Pleasant Hill](/source/Pleasant_Hill%2C_California)–[Concord](/source/Concord%2C_California) border to [State Route 4](/source/California_State_Route_4) in Concord. Along with [Interstate 580](/source/Interstate_580_(California)), [State Route 24](/source/California_State_Route_24), Interstate 680 and State Route 4, it serves as the most direct route between the [San Francisco Bay Area](/source/San_Francisco_Bay_Area) and the [Sacramento–San Joaquin River Delta](/source/Sacramento%E2%80%93San_Joaquin_River_Delta) region. In 2000, State Route 242 was widened to six through-traffic lanes for the entire route. Ramp metering is present at all onramps, and is used southbound in the morning and northbound in the evening. It was signed as part of State Route 24 until ca. 1987. ## Route description The route begins as a freeway at [Interstate 680](/source/Interstate_680_(California)) at the [Pleasant Hill](/source/Pleasant_Hill%2C_California)–[Concord](/source/Concord%2C_California) border. It then heads north into Concord, meeting Clayton Road, Concord Avenue, Grant Street, and Olivera Road before meeting its north end at [State Route 4](/source/California_State_Route_4) just west of the former [Concord Naval Weapons Station](/source/Concord_Naval_Weapons_Station).[2] SR 242 is part of the [California Freeway and Expressway System](/source/California_Freeway_and_Expressway_System),[3] and is part of the [National Highway System](/source/National_Highway_System_(United_States)),[4] a network of highways that are considered essential to the country's economy, defense, and mobility by the [Federal Highway Administration](/source/Federal_Highway_Administration).[5] ## Exit list The entire route is in [Contra Costa County](/source/Contra_Costa_County%2C_California). Location mi [6][1][7][8] km Exit [6] Destinations Notes Pleasant Hill–Concord line 0.00 0.00 1A I-680 south – Oakland, San Jose No access to I-680 north; south end of SR 242; I-680 north exit 50 Concord 1B Gregory Lane, Monument Boulevard Southbound exit and northbound entrance 0.87 1.40 1 Clayton Road – Concord Northbound exit and southbound entrance 1.47 2.37 1C Concord Avenue No northbound exit 2.15 3.46 2 Grant Street, Solano Way Serves John Muir Health – Concord Medical Center 2.79 4.49 3A Olivera Road Northbound exit and southbound entrance 3.40 5.47 3B–C SR 4 – Richmond, Stockton, Pittsburg Port Chicago Highway Northern end of SR 242; SR 4 exit 15A; signed as exits 3B (west, Richmond, Port Chicago Highway) and 3C (east, Stockton, Pittsburg) 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Incomplete access ## See also - [California Roads portal](https://en.wikipedia.org/wiki/Portal:California_Roads) - [San Francisco Bay Area portal](https://en.wikipedia.org/wiki/Portal:San_Francisco_Bay_Area) ## References 1. ^ [***a***](#cite_ref-trucklist_1-0) [***b***](#cite_ref-trucklist_1-1) California Department of Transportation. ["State Truck Route List"](https://web.archive.org/web/20150905083346/http://www.dot.ca.gov/hq/traffops/trucks/truckmap/truck-route-list.xlsx). Sacramento: California Department of Transportation. Archived from [the original](http://www.dot.ca.gov/hq/traffops/trucks/truckmap/truck-route-list.xlsx) ([XLS file](/source/Microsoft_Excel#File_formats)) on September 5, 2015. Retrieved June 30, 2015. 1. **[^](#cite_ref-tgba_2-0)** *Bay Area Metro Street Atlas* (Map). Thomas Brothers. 2008. 1. **[^](#cite_ref-cafes_3-0)** ["Article 2 of Chapter 2 of Division 1"](https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=SHC&division=1.&title=&part=&chapter=2.&article=2.). *California Streets and Highways Code*. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019. 1. **[^](#cite_ref-fhwa-nhs_4-0)** Federal Highway Administration (March 25, 2015). [*National Highway System: San Francisco–Oakland, CA*](https://www.fhwa.dot.gov/planning/national_highway_system/nhs_maps/california/san_francisco-oakland_ca.pdf) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 4, 2017. 1. **[^](#cite_ref-NHS-FHWA_5-0)** Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). ["What is the National Highway System?"](https://www.fhwa.dot.gov/planning/national_highway_system/). *National Highway System*. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012. 1. ^ [***a***](#cite_ref-calnexus_6-0) [***b***](#cite_ref-calnexus_6-1) ["State Route 242 Freeway Interchanges"](https://dot.ca.gov/-/media/dot-media/programs/safety-programs/documents/exit/f0017871-242-a11y.pdf) (PDF). *[California Numbered Exit Uniform System](/source/California_Numbered_Exit_Uniform_System)*. [California Department of Transportation](/source/California_Department_of_Transportation). October 30, 2018. Retrieved July 11, 2021. 1. **[^](#cite_ref-bridgelog_7-0)** California Department of Transportation (July 2007). ["Log of Bridges on State Highways"](https://web.archive.org/web/20120701125434/http://www.dot.ca.gov/hq/structur/strmaint/brlog2.htm). Sacramento: California Department of Transportation. 1. **[^](#cite_ref-8)** [California Department of Transportation](/source/California_Department_of_Transportation), [All Traffic Volumes on CSHS](http://traffic-counts.dot.ca.gov/), 2005 and 2006 ## External links **[KML file](https://en.wikipedia.org/w/index.php?title=Template:Attached_KML/California_State_Route_242&action=raw)** ([edit](https://en.wikipedia.org/w/index.php?title=Template:Attached_KML/California_State_Route_242&action=edit) · [help](https://en.wikipedia.org/wiki/Help:Attached_KML)) [Template:Attached KML/California State Route 242](https://en.wikipedia.org/wiki/Template:Attached_KML/California_State_Route_242) KML is from Wikidata Wikimedia Commons has media related to [California State Route 242](https://commons.wikimedia.org/wiki/Category:California_State_Route_242). - [Caltrans: State Route 242 highway conditions](https://roads.dot.ca.gov/) - [Caltrans Traffic Conditions Map](https://quickmap.dot.ca.gov/) - [California Highway Patrol Traffic Incidents](https://cad.chp.ca.gov/) - [California Highways: Route 242](http://www.cahighways.org/241-248.html#242) - [California @ AARoads.com - State Route 242](http://www.aaroads.com/california/ca-242.html) --- Adapted from the Wikipedia article [California State Route 242](https://en.wikipedia.org/wiki/California_State_Route_242) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/California_State_Route_242?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.