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California State Route 238: Map


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State Route 238 (SR 238) is a north-south highway in the U.S. state of Californiamarker. The route is a divided multilane surface highway in the southeastern part of the San Francisco Bay Areamarker. SR 238 connects Interstate 580 in Castro Valleymarker and Interstate 680 in Fremontmarker.

Route description

SR 238 goes through Haywardmarker and Union Citymarker parallel to the Hayward Hills. It formerly contained a segment of east-west freeway now designated as Interstate 238 and, until Interstate 680 was completed in the area and supplanted it completely as a through route, extended to San José, Californiamarker at its intersection with U.S. Route 101. Locally it is designated Mission Boulevard from I-680 to the intersection with State Route 92 and State Route 185 (which continues as Mission Boulevard), then from that intersection to I-580 as Foothill Boulevard.

Mission Boulevard

Mission Boulevard is the road that passes in front of Mission San Josemarker, the historic Spanish Mission founded in 1797, for which the road is named. Mission Boulevard proceeds in both directions from the Mission, but mainly northwest through Fremont, Union City, and Hayward. At the north end of Hayward it changes its name to East 14th Street, which continues as a major thoroughfare going through San Leandromarker and Oaklandmarker. Since it runs along the base of the hills, Mission Boulevard nearly coincides with the Hayward Fault, a major earthquake fault, for almost the entire length of the Boulevard.

Mission Boulevard joins the historic centers of the Mission San Jose and Niles districts of Fremont (formerly independent towns), the Decoto district of Union Citymarker (formerly an independent town), and Haywardmarker.


Before California massively renumbered its state highways in 1964, SR 238 was part of State Route 9. The segment of what is now Interstate 238 was built as a freeway in 1956, before it became part of the Interstate Highway System in 1983.

For several decades, SR 238 from Hayward to Fremont was also planned to be upgraded to a freeway, called the "Mission" or "Foothill" freeway. It was submitted to the Interstate Highway System in October 1968 but was rejected. Then after a series of lawsuits and appeals, Caltrans had to abandon the project in 2004 and sell off the property it had acquired in the name of eminent domain along the proposed route.

As an alternative, SR 238 is proposed to be expanded from two lanes in each direction to three lanes in each direction along the majority of its width. Changes proposed also include a one way circulation through Central Hayward, and various improvements to traffic signals and closure of minor streets intersecting with SR 238.

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 entire route is in Alameda Countymarker.
Location Postmile

Destinations Notes
Fremontmarker 0.00 Mission Boulevard Continuation beyond I-680
0.00 Interchange
Stevenson Boulevard
Walnut Avenue, Morrison Canyon Road
3.31 South end of SR 84 overlap
3.64 North end of SR 84 overlap
Union Citymarker 6.78 Decoto Road – Decoto District, Dumbarton Bridge
Whipple Road – Alvarado Districtmarker
Haywardmarker 9.32 Alquire Parkway, Industrial Parkway to I-880
9.94 Tennyson Road
11.20 Harder Road – San Mateo Bridge
13.12 A Street
Castro Valleymarker 14.29 Castro Valley Boulevard, Mattox Road Interchange northbound and at-grade intersection southbound
R14.47 Interchange; northbound exit and southbound entrance
R14.47 Interchange; northbound exit and southbound entrance


  1. January 1, 2006 California Log of Bridges on State Highways
  2. California Highways: Interstate Highway Types and the History of California's Interstates
  3. California Highways: Interstate 238
  4. Route 238 Corridor Improvement Project
  5. California Department of Transportation, State Truck Route List (XLS file), accessed February 2008
  6. California Department of Transportation, Log of Bridges on State Highways, July 2007
  7. California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006

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