The Caldecott Fourth Bore Project is composed of four construction contracts.  The project to build the fourth bore tunnel is by far the largest. Two smaller projects will facilitate traffic movement in the area and another project will landscape the staging areas after construction is complete.

Fourth Bore of the Caldecott Tunnel

The project was awarded to Tutor-Saliba Corporation in November 2009. Construction began in February 2010. The tunnel is scheduled to open to traffic in late 2013 , with final project completion planned for mid-2014

Kay Street Project

The Kay Street Project was awarded to Ghilotti Brothers Inc. Construction begian in February 2010. The project was completed in mid-June 2010.

Route 24/Highway 13 Interchange Project

Route 24/Highway 13 Interchange Project was awarded to RGW Construction Inc. Work began in January 2010. Most of the project will be finished by September 2010, with some minor landscaping to occur in the subsequent months.

Landscaping Project

The construction staging area will be landscaped after the Tunnel Project is complete. No schedule can be given for the project at this time, however as the Tunnel Project progresses the schedule for the landscaping project will be determined. This project includes a plant establishment period, when the contractor oversees the newly planted landscaping to assure that the plants are thriving. After that point, responsibility for the landscaping is handed over to Caltrans to maintain.