Caldecott Fourth Bore Project - TunnelCast
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15 November 2013: The US$420 million Caldecott Tunnel fourth bore opened to traffic after almost four years of construction. The project came in under budget and on time with no adjustment to the budget or the construction schedule. Local, state and federal officials were present for the ribbon-cutting ceremony for the tunnel through the hills east of Oakland, California. The fourth bore means two dedicated tunnels in each direction to ease traffic congestion for more than 160,000 commuters each day, and an end to the 50-year-old process of manually reversing the flow of traffic twice a day along the middle bore.

Snapshot

Caldecott Fourth Bore Project

Paula Wallis reporting for TunnelCast
Location:
Oakland, California
Tunnel:
1,033m long x 12.58m wide (3,389ft x 41.25ft) with seven cross passages connecting the third and fourth bores.
Type:
Road tunnel
Owner:
California Department of Transportation (Caltrans)
Contract Value:
$215 million
Method:
NATM
Contractor:
Tutor-Saliba
Designer:
Jacobs Associates
Construction Management:
Parsons Brinckerhoff / Gall Zeidler Consultants JV
Roadheader:
Aker Wirth T3.20