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 (including carpool lanes).

Additionally Interstate 680 through the Sunol Grade was improved in 2001-2003, resulting in eight lanes of traffic. As part of this expansion, two bridges that were constructed in part for the planned but never constructed SR 238/I-680 interchange (Hayward Bypass/Mission Freeway) were removed.

Prior to the completion of Interstates 280 and 680 through to their joint termini at U.S. 101, Temporary routes were posted along the then-California 17 freeway through San Jose - 1968 California Official Map

History

Prior to the construction of the freeway for Interstate 680, the corridor was previously part of California 21. With the completion of the Interstate 680 freeway in stages between San Jose and Fairfield in the 1960s and 1970s, California 21 was slowly decommissioned.

Prior to 1976, the northern most extent of Interstate 680 took the route west from Benicia to Interstate 80 at Vallejo. This changed with both the establishment of Interstate 780 along the former east-west leg to Vallejo and the replacement of California 21 north from Benicia as an extension of I-680 to 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. This project involved the replacement of approaches for northbound traffic along with a new bridge structure located east of the original span. The existing 1962 bridge was retrofitted to meet state seismic standards and restriped to carry southbound traffic over the river upon completion of the new bridge. With the completion of this bridge, the regular congestion that occurred as part of the reduced lanes, toll plazas, and Interstate 680/780 interchange was diminished.

Highway Guides

Southern Terminus - Interstate 280 and U.S. 101 - San Jose, California
Perspective from Interstate 280 south
Interstate 280 southbound (actually east at this point) approaching the stack interchange with Interstate 680 and U.S. 101. Photo taken 12/27/01.
Interstate 280 southbound (actually east at this point) approaching McLaughlin Avenue and the stack interchange with Interstate 680 and U.S. 101. The overhead signage now reads Interstate 680 rather than 280, but 280 does not end until the interchange itself. Photo taken 12/27/01.
Interstate 280 southbound (actually east at this point) at McLaughlin Avenue approaching the U.S. 101 interchange. Photo taken 12/27/01.
Interstate 280 southbound ends at this point under the U.S. 101 stack interchange. Northbound Interstate 680 begins here. No END Interstate 280 signage is present. Photo taken 12/27/01.
Perspective from Interstate 680 south
I-680 south turns west from Alum Rock, San Jose between North Valley and East San Jose toward U.S. 101 and the transition to Interstate 280 north. Photo taken 11/29/04.
Exit 1C departs for King Road and the Mayfair and the Gateway East neighborhoods just ahead of the four-level stack 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 as Interstate 280 north begins at the three-lane off-ramp (Exit 1B) for U.S. 101. I-280 extends the 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
This interchange sequence sign posted within the six-ramp parclo interchange at Capitol Expressway is the first indication of the pending junction (Exit 384) between northbound U.S. 101 and Interstates 280 and 680 north. Photo taken 03/25/16.
Exit 383 departs from U.S. 101 north to Tully Road. Four lanes continue north on the one mile approach to Interstates 280 north to San Francisco and 680 north to Walnut Creek. Photo taken 03/25/16.
North of Tully Road, U.S. 101 expands to six lanes in anticipation of the cloverstack interchange (Exit 384) with Interstates 280 and 680 north. Photo taken 03/25/16.
High speed flyovers pass above Story Road and the associated ramps with U.S. 101 to shuttle motorists onto Interstate 680 north to Milpitas and Fremont and I-280 west to Sunnyvale and north to Daly City. Photo taken 03/25/16.
Three quarters of a mile beyond the gore point for Exit 384, northbound U.S. 101 passes under the flyovers linking the freeway with I-280 and I-680. Photo taken 12/23/04.
Perspective from U.S. 101 south
This mileage sign provides the distance to Exit 385B, Junction Interstate 280 north to downtown San Jose and Interstate 680 north to Fremont and Walnut Creek. Photo taken 11/29/04.
Prior to reaching Interstate 280 and Interstate 680, U.S. 101 southbound first reaches Exit 386A, Junction California 130/Alum Rock Avenue. California 130 is planned as an potential freeway route between San Jose and the Central Valley, but for now California 130 is a twisty road to Mount Hamilton that does not meet Interstate 5. Photo taken 11/29/04.
Southbound U.S. 101 reaches Exit 386A, Junction California 130/Alum Rock Avenue. The next exit is Exit 385B, Junction Interstate 280 and Interstate 680. Photo taken 11/29/04.
Southbound U.S. 101 approaches Exit 385B, Junction Interstate 280 and Interstate 680. Although marked as north, Interstate 280 actually travels west through Silicon Valley briefly before it turns north toward San Francisco. Interstate 680 is signed with Sacramento as its control city, but it passes through several major cities including Pleasanton, Walnut Creek, and Concord along the way. Photo taken 11/29/04.
The right two lanes of southbound U.S. 101 connect to Interstate 280 north and Interstate 680 north. The left four lanes continue south on U.S. 101, which is signed with a control city of Los Angeles. Photo taken 11/29/04.
Southbound U.S. 101 reaches Exit 385B, Junction Interstate 280 and Interstate 680. This is one of the rare instances where a three-digit Interstate route with an even first number ends at a non-Interstate. Other examples include Interstate 264 in Virginia Beach, Virginia, and Interstate 635 northwest of Dallas, Texas. Photo taken 11/29/04.
View of the Interstate 280/Interstate 680 stack interchange as seen along southbound U.S. 101 in San Jose. Photo taken 11/29/04.
Northern Terminus - Interstate 80 and California 12 - Fairfield, California
Perspective from Interstate 680 north
Green Valley Road (Exit 70) serves the community of Cordelia and accesses old U.S. 40 and an antique mall. Photo taken 04/02/04.
The final three exits along northbound Interstate 680 are Exit 70, Green Valley Road/Cordelia; Exit 71A, Junction California 12/Interstate 80 West and Exit 71B, Junction California 12/Interstate 80 East. Photo taken 10/20/00.
Northbound Interstate 680 at Exit 70, Green Valley Road/Cordelia. Photo taken 04/02/04.
Northbound Interstate 680 approaches Exits 71A-B, Junction Interstate 80 and California 12. This interchange marks the northern terminus of Interstate 680. Photo taken 04/02/04.
Northbound Interstate 680 at Exits 71A-B, Junction Interstate 80 and California 12. Eastbound Interstate 80/California 12 lead to Fairfield; the routes divide at Fairfield, with California 12 continuing east to Lodi, while Interstate 80 leads northeast to Sacramento. Westbound Interstate 80/California 12 remain merged briefly, and California 12 splits northwest toward Napa, Sonoma, and Santa Rosa. Interstate 80 turns southwest toward Vallejo, Berkeley, Oakland, and ultimately San Francisco. Note that the sign panel on the right erroneously omitted the California 12 eastbound shield. Photo taken 04/02/04.
Perspective from Interstate 80 & California 12 west
The next two major exits along westbound Interstate 80/California 12 are for Southbound Interstate 680 to Contra Costa County and San Jose and Westbound California 12 to Napa, Sonoma, and Santa Rosa. Photo taken 08/23/03.
Westbound Interstate 80/California 12 at Suisun Valley Road/Green Valley Road, one half mile before its junction with southbound Interstate 680. The City of Fairfield is mostly east of the freeway interchange, and this area has more of a rural feel to it. Photo taken 08/23/03.
Westbound Interstate 80/California 12 approaching Junction Southbound Interstate 680, next right. Photo taken 08/23/03.
Westbound Interstate 80/California 12 at Junction Southbound Interstate 680. This is also the former northern end of California 21 before it was decommissioned. Interstate 680 skirts 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 08/23/03.
Perspective from Interstate 80 & California 12 east
Eastbound Interstate 80/California 12 approaches Interstate 680 and Green Valley Road near Fairfield. Photo taken 11/28/04.
Use the right lane to connect from eastbound Interstate 80/California 12 to southbound Interstate 680. This ramp also leads to an exit for Green Valley Road, as both exits are separated by a collector-distributor lane configuration. Photo taken 11/28/04.
Use the Interstate 680 exit to connect to Green Valley Road, which serves Cordelia. A few universities have branches near the interchange. Photo taken 11/28/04.
Eastbound Interstate 80/California 12 reaches the offramp to Green Valley Road/Cordelia and Interstate 680 southbound. Photo taken 11/28/04.
Now on the collector/distributor lanes, the first exit ramp is to Green Valley Road, which serves Cordelia. The left lane continues straight ahead to connect to the transition ramp to Interstate 680 southbound. Photo taken 11/28/04.
After the onramp from Green Valley Road, the exit ramp is again two lanes. The left lane will return to eastbound Interstate 80, so traffic to southbound Interstate 680 must merge to the right lane. Photo taken 11/28/04.
The collector-distributor lane reaches the transition ramp to southbound Interstate 680. The left lane will return to Interstate 80. Photo taken 11/28/04.

Page Updated April 5, 2016.

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Mileage

State California
Mileage 70.52
Cities San Jose, Milpitas, Fremont, Walnut Creek, Concord
Junctions Interstate 280, Interstate 580, Interstate 780, Interstate 80
Source: December 31, 2015 Interstate Route Log and Finders List
I-680 California Annual Average Daily Traffic

State Location AADT Composite Year
California San Jose 242,000 2002
California Fremont 156,000 2002
California Pleasanton 130,000 2002
California Danville 167,000 2002
California Walnut Creek 249,000 2002
California Benicia 57,000 2002
Source: Caltrans, Traffic Operations Program - Traffic and Vehicle Data Systems [2002]
Complete Interstate 680 AADT data.
Interstate 680 between San Jose and Vallejo - 1966 California Official Highway Map.
California 21 was replaced by California 17 and Interstate 680 between San Jose and Cordelia. The last segment was transferred to I-680 in 1976.
The southernmost stretch of Interstate 680 under construction in 1973.
Interstate 680 in San Jose was completed in 1974, two years after the opening of Interstate 280. Note that I-680 was temporarily signed along California 17 to make the connection between San Jose and Fremont.