California State Route 242

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State Route 242 marker

State Route 242
Map of Contra Costa County in western California with SR 242 highlighted in red
Route information
Defined by Streets and Highways Code § 542
Maintained by Caltrans
Length: 3.398 mi[1] (5.469 km)
Major junctions
South end: I-680 in Concord
North end: SR 4 in Concord
Counties: Contra Costa
Highway system
SR 241 SR 243

State Route 242 (SR 242) is a short three-mile (5 km) connector route that links Interstate 680 north of Pleasant Hill to State Route 4 in Concord. 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. Currently, along with Interstate 580, State Route 24, Interstate 680, and State Route 4, it serves as the most direct route between the San Francisco Bay Area and the Sacramento River Delta region of Northern California.

Route description[edit]

SR 242 is part of the California Freeway and Expressway System.[2] The route begins as a freeway at Interstate 680 in Concord. It then heads north, meeting Clayton Road, Concord Avenue, Grant Street, and Olivera Road before meeting its north end at State Route 4 just west of the former Concord Naval Weapons Station.[3]

Exit list[edit]

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).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in Concord, Contra Costa County.

Destinations Notes
R0.00 1A I-680 south – Oakland, San Jose Southbound exit and northbound entrance; south end of SR 242; I-680 north exit 50
R0.00 1B Gregory Lane, Monument Boulevard Southbound exit and northbound entrance
R0.87 1 Clayton Road – Concord Northbound exit and southbound entrance
R1.47 1C Concord Avenue No northbound exit
R2.15 2 Grant Street, Solano Way
R2.79 3A Olivera Road Northbound exit and southbound entrance
R3.40 3 SR 4 / Port Chicago Highway – Stockton, Pittsburg, Richmond, Martinez Northbound exit and southbound entrance; signed as exits 3B (west, Port Chicago Highway) and 3C (east); north end of SR 242; SR 4 exit 15A
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


  1. ^ 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. 
  2. ^ CA Codes (shc:250-257)
  3. ^ Bay Area Metro Street Atlas (Map). Thomas Brothers. 2008. 
  4. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  5. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  6. ^ California Department of Transportation, California Numbered Exit Uniform System, SR-242 Northbound and SR-242 Southbound, accessed February 2008

External links[edit]

Route map: Bing / Google

KML is from Wikidata