Interstate 680

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Interstate 680

The original Benicia-Martinez Bridge was opened to traffic on September 15, 1962 (George Miller, Jr. Bridge, deck truss span, 1.2 miles); the new span opened on August 25, 2007 (segmented concrete span, George Miller III Bridge, 1.7 miles). A Union Pacific railroad lift bridge sits between the two spans; it was built in 1929-1930. This photo was taken before the new span was completed. Photo taken 12/29/04.


Interstate 680 connects the cities of San Jose, Milpitas, Fremont, Pleasanton, San Ramon, Danville, Alamo, Walnut Creek, Pleasant Hill, Concord, Martinez, and Benicia in the eastern suburbs of the San Francisco Bay Area. It is a heavily traveled route that is being expanded and widened in several locations. The section of freeway through San Jose and Milpitas is generally eight lanes, but it is only four to six lanes wide through Sunol (rural area between Fremont and Pleasanton). This section is being widened to accommodate commuters between the jobs in Silicon Valley and affordable housing in the Central Valley. The former cloverleaf at the junction of Interstates 580 and 680 is in the midst of a reconstruction, and the freeway between Pleasanton and Concord has recently been expanded. Preliminary design is underway for work to be performed on the toll Martinez-Benicia Bridge over Suisun Bay. Interstate 680 ends at its junction with Interstate 80 near Cordelia.


Key Opening Dates of Interstate 680:

  • Interstate 280 and U.S. 101 to McKee Road September 4, 1974
  • McKee Road to Hostetter Road December 15, 1974
  • Hostetter Road to California 237 September 5, 1974
  • California 237 to California 262 March 17, 1971
  • California 262 to California 238 January 28, 1971
  • California 238 to California 84 January 9, 1964 (widened December 14th, 1990)
  • California 84 to Frager Road November 8, 1967 (widened December 14th, 1990)
  • Frager Road to Stoneridge Drive November 8, 1967 (widened December 5th, 1989)
  • Stoneridge Drive to Interstate 580 December 16, 1965 (widened December 5th, 1989)
  • California 84 to Interstate 580 November 8, 1967
  • Interstate 580 to city limits of Pleasanton and Dublin - December 16, 1965
  • City limits of Pleasanton and Dublin to Alcosta Boulevard December 16, 1965 (widened May 18, 1995)
  • Alcosta Boulevard to Sycamore Valley Road January 3, 1967 (widened May 18, 1995)
  • Sycamore Valley Road to South Main Street December 1, 1964 (widened May 18, 1995)
  • South Main Street to Ygnacio Valley Road Circa 1960 (widened March 5, 1999)
  • Ygnacio Valley Road to Geary Road Circa 1956 (widened March 5, 1999)
  • Geary Road to Contra Costa Boulevard Circa 1956 (widened November 12, 1998)
  • Contra Costa Boulevard to Monument Boulevard Circa 1963 (widened January 1, 1990)
  • Monument Boulevard to California 242 Circa 1963 (widened September 7, 1974)
  • California 242 to Willow Pass Road April 21, 1964 (widened September 7, 1974)
  • Willow Pass Road to Mococo Overhead Circa 1962 (widened October 2, 1991)
  • Mococo Overhead to Contra Costa-Solano County Line Circa 1962 (widened November 12, 1991)
  • Benicia-Martinez (George Miller, Jr.) Bridge - September 15, 1962 (northbound span built on August 25, 2007)
  • Contra Costa-Solano County Line to Interstate 780 December 31, 1978 (widened November 12, 1991)
  • Interstate 780 to N. Ramp for Interstate 780 July 13, 1973
  • N. Ramp for Interstate 780 to Cordelia Overhead August 22, 1966
  • Cordelia Overhead to Interstate 80 Circa 1961 (widened August 22, 1966)

Many thanks to C.J. Moon for his assistance in providing this historical chronology.

Highway Guide

Interstate 680 is split into the following pages:

Scenes Pertaining to Interstate 680
The above signage for Junction Interstate 680 is found along Crow Canyon Road (Exit 36), and these photoboxes also include several pictures of a trailblazer shield on northbound San Ramon Valley Boulevard. Note the control cities of Sacramento (northbound) and San Jose (southbound). Photos taken 12/27/01.
The above signage is found along Stone Valley Road in Alamo as it approaches Interstate 680. The Blue Star Memorial Highway marker is located in a landscaped area within the interchange complex. Photos taken 10/20/00.
This series of pictures (above and below) shows Interstate 680 trailblazer route markers and green guide signs posted in and around the North Main Street interchange in Walnut Creek. Photos taken 07/15/09.
This shield image is taken at the industrial park area at Exit 60 (Industrial Way/Bayshore Road). The reserve fleet is located on Suisun Bay, which is the wide portion of the delta that can be seen from the Benicia-Martinez Bridge looking east. Photo taken 12/29/04.
A freeway entrance shield for Interstate 680 is posted at Exit 60 (Industrial Way/Bayshore Road) in Benicia near the Valero oil refinery. Photo taken 12/29/04.
This view shows view from Bayshore Road looking at the Benicia-Martinez 1962 span during evening light. Photo taken 12/29/04.
Looking south toward the city of Martinez over the Carquinez Strait, this view of the original 1962 Benicia-Martinez Bridge and the railroad bridge can be seen from Bayshore Road in Benicia. Photo taken 12/29/04.

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Page Updated November 18, 2011.