I-680 widening aims to improve traffic

Ramp closures expected through the week

Caltrans and the Contra Costa Transportation Authority officially began construction on the Interstate 680 auxiliary lanes improvement project in the San Ramon Valley over the weekend. The lanes will connect the entrance and exit ramps between the Sycamore Valley Road and Crow Canyon Road interchanges on I-680 in both directions. When completed, the auxiliary lanes will help reduce traffic congestion and increase safety for commuters.

I-680 will be widened approximately 12 feet in along the shoulder area in both northbound and southbound directions between Sycamore Valley Road and Crow Canyon Road. Lanes will be shifted to the median and the roadway restriped so that work can take place on the shoulder behind K-rail concrete barriers.

In order to shift lanes, place K-rail and perform other construction activities, Caltrans will conduct lane closures from 8 p.m. to 5 a.m. Monday night through Thursday night, and Friday night from 8 p.m. to 8 a.m. Other activities will take place during the day, behind the K-rail.

The following ramps will be closed intermittently; traffic control will be in effect and detours will be posted. Motorists are asked to exercise caution through the roadwork zones.

April 1: Northbound Crow Canyon Road On-Ramp, Northbound Sycamore Valley Road Off-Ramp

April 2: Northbound Crow Canyon Road On-Ramp, Northbound Sycamore Valley Road Off-Ramp, Southbound Sycamore Valley Road Off-Ramp

April 3: Southbound Sycamore Valley Road On-Ramp

April 4: Northbound Crow Canyon Road On-Ramp, Northbound Sycamore Valley Road Off-Ramp, Southbound Sycamore Valley Road On-Ramp

April 5: Northbound Crow Canyon Road On-Ramp, Northbound Sycamore Valley Road Off-Ramp

April 8 and April 9: Southbound Sycamore Valley Road On-Ramp

The project includes reconstruction of existing soundwalls on northbound I-680 between Fostoria Way and Sycamore Valley Road. A new soundwall will be constructed on southbound I-680, approximately 600 feet north of the Greenbrook overcrossing and will extend for 1,500 feet to the north. Once roadway construction is complete, landscaping will be replanted along the entire project area.

"This project serves as a strong validation for Contra Costa County voters, who passed Measure J in 2004 to pay for transportation improvements in the county," said Randell Iwasaki, Executive Director for the Authority.

The first segment of the I-680 Auxiliary Lanes Improvement Project was constructed and opened to traffic in 2006, and created auxiliary lanes in the Town of Danville between Diablo Road and Sycamore Valley Road. In 2007, auxiliary lanes were completed in the City of San Ramon between Crow Canyon Road and Bollinger Canyon Road. This final segment of auxiliary is expected to open to traffic in 2014. Earlier this year, trees were removed from the project area in both northbound and southbound directions to facilitate construction.

The first phase of the project -- which constructed auxiliary lanes from Diablo Road to Sycamore Valley Road in Danville and from Crow Canyon Road to Bollinger Canyon Road to in San Ramon -- was completed in 2006.

The contract was awarded to Bay Cities Paving & Grading, Inc/Myers J.V. With approximately 15 subcontractors and ten vendors, 100 jobs in Contra Costa County have been created as a result of this project.

For more information on the I-680 Auxiliary Lanes project, go to the Project webpage, or contact the Project Information Line at 262-1158 or e-mail at


Posted by Ron F, a resident of Danville
on Apr 1, 2013 at 6:14 am

At least it's during spring break but I wish this would extend through the HoV lane too near Walnut creek pass 24 where it bottle necks.

Posted by sgrehome , a resident of Danville
on Apr 2, 2013 at 8:18 am

I guess it's a good thing, but why couldn't they do it as part of the repaving effort last year? They had those ramps closed almost every night then!

Posted by observer, a resident of Alamo
on Apr 2, 2013 at 9:42 am

Who in the world plans these projects? Now they are tearing up the road again to broaden it? They couldn't have thought ahead and done this when the repaved? Who is in charge of our street boondoggles?

Posted by Homeowner on San Ramon Valley Blvd, a resident of Danville
on Apr 2, 2013 at 9:04 pm

So sad to see all the tree taken down. Such an increase in the noise. :( I'm sure that the new landscaping will be very small trees. I'm sure that it will be another 10 years until the tree become as tall as they were. It will be terrible to try to sleep with all the extre noise on the summer nights when we would normally have windows open. Why has it taken sooo link to complete this project? And I agree why couldn't it have been done with the repaving project. Bad planning!

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