Interstate 680 California

Routing

One of the busiest freeways in the East Bay, Interstate 680 connects the communities of Benicia, Concord, Walnut Creek, Danville, Sunol and San Jose. The section between Interstate 580 and the Benicia Bridge underwent extensive reconstruction through the late 1990s, resulting in an eight to ten-lane freeway with carpool lanes.

Additionally Interstate 680 through the Sunol Grade was improved in 2001-2003. As part of the eight lane expansion, two bridges that were constructed in part for the planned interchange with SR 238 (Hayward Bypass/Mission Freeway) were removed.

Prior to the completion of I-280 and I-680 to their shared end point at U.S. 101, Temporary routes were posted along the SR 17 freeway through San Jose - 1968 California Official Map

History

The Interstate 680 corridor was previously part of California 21. Construction of the freeway gradually overtook the state route between San Jose and Fairfield in the 1960s and 1970s.

Prior to 1976, the northern most extent of Interstate 680 turned west from Benicia to I-80 at Vallejo. This changed with both the establishment of Interstate 780 along the former east-west leg to Vallejo and the extension of I-680 north over what was the remaining section of California 21 between Benicia and I-80 at Coredlia.

The 1.2-mile long, deck-truss Benicia-Martinez Bridge over the Sacramento-San Joaquin River Delta was augmented with a parallel bridge. Started in 2001, this project involved the replacement of approaches for northbound traffic along with a new bridge structure located east of the original span. Following completion of the second span on August 25, 2007, the existing 1962 bridge was retrofitted to meet state seismic standards and restriped to carry southbound traffic. With the completion of the $1.2 billion project, the regular congestion that occurred as part of the reduced lanes, toll plazas, and the adjacent interchange with I-780 diminished.1

Highway Guides

Southern Terminus - Interstate 280 and U.S. 101 - San Jose, California
Perspective from Interstate 280 south
Southbound Interstate 280 at the systems interchange with U.S. 101 and transition to I-680 north. Photo taken 11/25/07.
Perspective from Interstate 680 south
Exit 1C departs for King Road and the Mayfair and the Gateway East neighborhoods just ahead of the four-level interchange (Exit 1B) with U.S. 101 (Bayshore Freeway). U.S. 101 links San Jose with San Francisco to the north and Salinas to the south. Photo taken 03/27/16.
Interstate 680 south ends and Interstate 280 north begins at the three-lane off-ramp (Exit 1B) for U.S. 101. I-280 extends the Sinclair Freeway southwest to Downtown, Burbank and West San Jose. Photo taken 03/27/16.
U.S. 101 leads west from I-280 / 680 to Santa Clara and Sunnyvale and southeast to Edenvale and Santa Teresa in south San Jose. Photo taken 03/27/16.
Perspective from U.S. 101 north
Two miles southeast of I-280/I-680 on U.S. 101 northbound at the six-ramp parclo interchange with Capitol Expressway. Photo taken 03/25/16.
Exit 383 departs from U.S. 101 north to Tully Road. Four lanes continue north one mile to I-280 north to San Francisco and I-680 north to Walnut Creek. This set of button copy signs was replaced by 2013 to incorporate exit numbers. Photo taken 12/23/04.
North of Tully Road, U.S. 101 expands to six lanes leading into the cloverstack interchange (Exit 384) with I-280 west to Sunnyvale and I-680 north to Milpitas and Fremont. Photo taken 03/25/16.
Exit 384 departs U.S. 101 northbound, taking motorists onto Interstate 680 north to Milpitas and Fremont and I-280 west to Sunnyvale and north to Daly City. Photo taken 12/23/04.
Story Road and high speed flyovers linking with I-280 and I-680 with U.S. 101 pass overhead 0.75 miles beyond the gore point for Exit 384. Photo taken 12/23/04.
Perspective from U.S. 101 south
Southbound U.S. 101 reaches Exit 385B for I-280 and I-680 north. Interstate 280 initially travels west through Silicon Valley before it turns north toward San Francisco. Photo taken 11/29/04.
Northern Terminus - Interstate 80 and California 12 - Fairfield, California
Perspective from Interstate 680 north
Interstate 680 enters the trumpet interchange with I-80 & SR 12 just north of the Cordelia Road underpass at Cordelia. Photo taken 06/21/15.
Exits 71A-B separate from I-680 north for I-80 & SR 12. Interstate 80 & SR 12 east divide at Fairfield with SR 12 continuing to Lodi and I-80 angling northeast to Sacramento. Interstate 80 and SR 12 partition just west of I-680. The state route navigates through Jameson Canyon toward Napa, Sonoma, and Santa Rosa. Interstate 80 turns southwest through American Canyon toward Vallejo. Photo taken 06/21/15.
Perspective from Interstate 80 & California 12 west
One half mile ahead of Interstate 680 on I-80/SR 12 west in Fairfield. Photo taken 07/11/18.
Exit 41 departs just ahead of I-680 to areas of southwest Fairfield at Green Valley. Photo taken 07/11/18.
Interstate 680 traverses the lowlands of the California Delta before meeting Interstate 780 in Benicia and entering congested Contra Costa County, home of cities such as Martinez, Concord, Pleasant Hill, Walnut Creek and Danville. Photo taken 07/11/18.
Two lanes follow for Interstate 680 south to the Benicia-Martinez Bridge and San Jose from I-80 & SR 12 west at Exit 40. Photo taken 07/11/18.
Perspective from Interstate 80 & California 12 east
California 12 combines with Interstate 80 eastbound at a wye interchange preceding the north end of I-680 at Green Valley in Fairfield. Photo taken 07/24/16.
A collector distributor roadway (Exit 40) separates from I-80 east beyond the merge with California 12 to both Green Valley Road and Interstate 680 south. Photo taken 07/24/16.
A single lane ramp leaves I-80/SR 12 east for Green Valley Road to Cordelia and Interstate 680 south. I-680 straddles the eastern foothills of Sulpur Springs Mountain above wetland areas spreading west from Grizzly Bay. Photo taken 07/24/16.
Right in right out (RIRO) ramps link the c/d roadway at Exit 40 with Green Valley Road ahead of I-680. Photo taken 11/28/04.
The ramp for Interstate 680 south to Concord, Walnut Creek and San Jose follows. Photo taken 11/28/04.

Sources:

  1. Benicia-Martinez Bridge. Metropolitan Transportation Commission web page.

Page updated March 12, 2019.