Above the new Caldecott Fourth Bore, six medallions designed by students in K-12 from Contra Costa and Alameda counties will be cast in concrete. The medallions adorning the entrances of the original two bores were designed in the mid-1930s, and the Caldecott Tunnel and the portals were designated a City of Oakland Keep reading >>
By: Trucy Phan
The latest graphic and numbers are in for the Caldecott Tunnel Fourth Bore!
Eastern portal:
As of October 8, 2011. In standard units, the contractors are 2,385 feet in on the top portion from the east, and 528 feet in on the top portion from the west (almost 90%); and approximately 197 feet in on the bottom portion from the west. That’s a lot of Keep reading >>
By: Trucy Phan
The Caldecott Tunnel fourth bore is moving along, and grabbing some great media attention along the way!
The New York Times interviewed miners working hard on the tunnel, and used the tunnel as an example of a successful stimulus project, in their piece: Caldecott Tunnel Edges Forward, Tribute to Stimulus Keep reading >>
By: Ruth Miller
What a difference a year makes! The Fourth Bore project has been underway for a year, and make some incredible progress.
On the way, we found fossils, saw some stunning pictures, and learned about the ancient geology of our community. Now, only 109.5 meters remain, and the project Keep reading >>
By: Ruth MillerAs of August 13, the Caldecott Tunnel construction is progressing as follows:
Source: http://caldecott-tunnel.org/ Keep reading >>
By: Trucy Phan
Just in – new numbers and a new graphic for the Caldecott Tunnel construction:
With nearly 590 meters tunneled and just over 400 meters left to go, the top heading of the Caldecott Tunnel Fourth Bore is now 60% complete!
Read Keep reading >>
By: Trucy Phan
571.5 meters down, 418.5 meters to go.
The new Caldecott Tunnel is over 57 percent done!
The geological wonders continue. Read about the fossils that Caltrans is digging up in the remaining Sobrante and Claremont sections, or the special precautions crews must take as they dig through the “gasey” Keep reading >>
By: Ruth Miller
Of all the people working day and night to drill the fourth bore of the Caldecott tunnel, the coolest job has to be “paleontological mitigation”.
In the last several million years, Contra Costa County has undergone some changes. Several of the excavated fossils are from the Micone era, which lasted Keep reading >>
By: Ruth Miller
As if tunneling into the East Bay hills wasn’t hard enough, the hint of natural methane in the soil means that crews working on the Caldecott Tunnel can’t use internal combustion engines, cell phones, or even cameras – anything that could make a spark.
These considerations make the Caldecott Tunnel Keep reading >>
By: Ruth Miller