It’s not quite connecting the transcontinental railroad, but for commuters who have sat in traffic for years at the Caldecott Tunnel, it’s definitely a milestone.

The San Jose Mercury News is reporting that excavation gear in the fourth bore construction has hit the other side:

Caltrans contractors broke through the Orinda hillside on Tuesday afternoon, connecting the two sections of the tunnel being dug to create the fourth bore of the Caldecott Tunnel.

A giant excavating machine called a roadheader pierced through a wall about 2:45 p.m. deep inside the tunnel, Caltrans spokeswoman Ivy Morrision said.

The fourth bore is projected to open in late 2013.

Caldecott Tunnel Fourth Bore Breakthrough 29 November,2011Rachel Dornhelm


Rachel Dornhelm

Rachel Dornhelm has worked as a reporter, editor and producer in public radio for the last twelve years. She got her start in New York City at WNYC and went on to work with the national business program Marketplace, WBUR’s “On Point” and KQED News in San Francisco. Her work has been honored by the LA Press Club and the SF-Peninsula Press Club.

Rachel has a BA with honors in anthropology from Rice University and did graduate work at NYU.

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