According to an email on Tuesday, April 12, 2016, from Contra Costa County Supervisor Candace Andersen, the City of Dublin will be closing Tassajara Road/Camino Tassajara Road near the Alameda County/Contra Costa County line from May through December. The extended closure is necessary in order to replace a failing culvert which runs under Tassajara Road. The replacement of this aging culvert will provide greater safety for motorists and will reduce the likelihood of emergency road closures in the future.

All regulatory permits have been secured for the replacement of Moller Creek Culvert on Tassajara Road. Signage will soon be posted to notify drivers that the road closure will begin on May 2, 2016.

This project will require a portion of Tassajara Road/Camino Tassajara to be closed between the May 2, 2016, start date and December 2016. The closure will block access along Tassajara Road, north of Fallon Road. Drivers, bicyclists, and pedestrians will be unable to use Tassajara Road/Camino Tassajara to travel between Dublin and the San Ramon/Danville area for the duration of the work and will need to take alternate routes. Alternative routes include both Windemere Parkway and Bollinger Canyon Road. While through traffic will not be permitted, local residents will be allowed to access their properties from the north.

Emergency responders and service providers have been notified and will be prepared to provide services during the road closure.

Frequently Asked Questions, a map of the closure area with alternate routes, and updates on the project can be found by clicking here.

Please contact the City of Dublin Public Works at (925) 833-6630 with any questions you may have about this project.

 

Summary 

In April, construction crews will continue installing the large overhead signs already visible throughout the corridor. Also, electrical work for the communications network will continue on some city streets.

Purpose

The overhead sign frames will support the future travel and toll information signs and the communications network will facilitate the transmission of data for the express lanes.

What to Expect

• Intermittent and alternating nightly closures will occur in the northbound and southbound directions on I-680 from Walnut Creek to San Ramon in the lanes closest to the median and in the lane closest to the shoulder. Approved construction work hours are: Monday through Thursday from 8 p.m. – 5 a.m., Friday from 8 p.m. – 7 a.m., Saturday from 7 p.m. to 10 a.m.
• To support directional boring and the installation of conduit, the following ramp closures are scheduled for (detour routes below):

• Southbound Alcosta Blvd. off-ramp is scheduled to be closed from 8 p.m. until 5 a.m. each night, Monday, April 11 through Friday, April 15.
• Northbound Stone Valley Rd. on-ramp is scheduled to be closed from 9 p.m. until 5 a.m. each night, from Monday, April 11 through Friday, April 15.

• To maintain a safe work zone, construction activity on San Ramon Valley Boulevard and Crow Canyon Road will require lane reductions and reduced speed limits, weekdays from April 4 through June 30, between the hours of 9:30 a.m. and 3:00 p.m.
• Construction crews will be present on some city streets during the day near I-680 from Martinez to Dublin with temporary and minor pedestrian detours to maintain public safety.
• Temporary k-rail, construction signage and orange plastic fencing will be present from Martinez to Dublin to maintain a safe work zone.
• Construction lighting will be present and directed away from residential areas.

Construction is a dynamic process and information is subject to change without notice. Please use caution while traveling through the construction zone.

Ramp Closure Detours

Southbound Alcosta Blvd. off-ramp closure detour: Continue on I-680 southbound past Alcosta Blvd., Exit at Dublin Blvd., Enter I-680 northbound at Dublin Blvd., Continue northbound on I-680, and Exit at Alcosta Blvd.

Northbound Stone Valley Rd. on-ramp closure detour:  At Stone Valley Road, Enter I-680 southbound, Exit at El Pintado Rd., and Enter I-680 northbound at El Pintado Rd.