Construction activity related to the Interstate 680 auxiliary lanes, segment two project will begin this week, with night work occurring this week and next week on I-680 between Crow Canyon Road and Sycamore Valley Road.
Contractors will implement lane shifts and traffic striping modifications on northbound 680 on Wednesday, March 27 and Thursday, March 28 from 10 p.m. till 4 a.m. As a result, the northbound on-ramp at Crow Canyon Road and northbound off-ramp at Sycamore Valley Road will be closed on March 28 during that period.
Next week, work will shift to the southbound side on April 1 and April 2. The southbound on-ramp at Sycamore Valley Road will be completely closed between 10 p.m. and 4 a.m. on Tuesday.
The closures are necessary in order to maintain safety in the work area, though all closures are weather permitting. Detours will be in place to assist motorists.
The auxiliary lanes will be exclusive lanes that 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.
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.
This segment is the last phase of a project originally identified in 1988 as a part of Contra Costa's half-cent transportation sales tax measure.
Preparation work on the project, which includes tree removal prior to bird nesting season is underway. The project will be managed by Caltrans with oversight by the Contra Costa Transportation Authority.
For more information on the auxiliary lanes project, contact the project information line at 262-1158 or email I680auxlanes@gmail.com.