Ygnacio Valley Road Repair
Update – June 2, 2008
On April 30, 2008 the City received Federal Environmental Clearance for the permanent restoration of Ygnacio Valley Road. The City is now awaiting construction authorization from Caltrans and the Federal Highway Administration (FHWA). We anticipate receipt of construction authorization in time to begin construction in late summer 2008, with completion of the work scheduled for the following fall.
Construction will be conducted in two Phases:
- Part 1 will construct the underground wall system. During Phase 1, there will be no lane closures.
- Part 2 will repair and repave the eastbound traffic lane and shoulder. During this phase, lane closures will be minimal, and will occur only during non-peak hours or weekends.
Layout depicting the location of the underground structure
Background
In March 2006, a 1,000-foot segment of one eastbound lane of Ygnacio Valley Road west of Cowell Road was closed due to a landslide.
The City acted quickly, applying for federal emergency relief funds to assist in repairing the damaged roadway. With Caltrans' assistance, Concord was awarded $1.4 million in federal emergency relief funds, allowing the City to quickly implement a temporary repair. On June 17, 2006, the City completed the temporary repair, which included the construction of an auxiliary lane, thus restoring two eastbound lanes.
In December 2007, the Federal Highway Administration (FHWA) awarded the City a grant for the $2.7 million permanent restoration of Ygnacio Valley Road. The work mainly consists of repairing the damaged pavement (traffic lane and shoulder) and constructing an underground structure to protect the roadway from future landslide. This protective structure consists of a 420-foot wall system, extending about 60 feet underground.
