The construction on the Caldecott Tunnel’s fourth bore is expected to be finished in mid-2013 with the fourth bore opening up to traffic in late-2013. The fourth bore will allow for two bores to be open in each direction at all times, helping to counteract reverse commute traffic.
The two crews boring from each side of the hill have met, connecting the tunnel from Orinda to Oakland.
Crews are currently working on digging out the lower part of the tunnel. That section, known as the bench, is where the pavers will come in and lay down road.
The Caldecott Tunnel’s fourth bore construction is being done at a cost of $391 million.