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Caldecott Tunnel Fourth Bore Breakthrough

| November 29, 2011
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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.

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About the Author ()

Rachel Dornhelm got her start in radio at WHYY. After anthropology graduate school, Rachel lived in Uzbekistan working with youth near the drying Aral Sea. Rachel returned to radio full-time in 2001. Her work has appeared on WNYC, WBUR, Marketplace, NPR news magazines and KQED. Reach Rachel Dornhelm at rdornhelm@kqed.org.

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