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.
Routing
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.
History
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:
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