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Coastal Stuff, Innovation

Tunneling to Pacifica

09.17.07 | 6 Comments

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Aerial photo of Devil’s Slide Project
Aerial view of Devil's Slide Tunnel and Bridge project

Today, I visited the south construction zone for the Devil’s Slide Tunnel by-pass project. It was a dog and pony show with many local politicians showing up to state their support and claim credit for their contributions. It wasn’t nearly as offensive as it could have been, some of the speakers even managed a little self-deprecating humor. The most important thing is, the digging is now under way after 2 years of preparatory work on site, and 11 years after voters approved the project in 1996.

The two tunnels when complete will be 4,200 feet (1,280m) in length each from the portal on the south side (Half Moon Bay) to the Shamrock Ranch portal. The tunnels will be exacavated using the New Austrian Tunneling Method which uses lithostatic force from the surrounding rock mass to stabilize the tunnel structure. From the north side, the tunnels will exit onto twin 1,000 foot (305m) long bridges across a deep valley. Work on the bridges should be complete by the summer of 2008, work on the tunnels should be complete by winter 2010, and all the clean-up and associated projects should be completed by 2011. The existing Route 1 over Devil’s Slide will become a recreation area.

I snapped some photos while at the event, they’re embedded below with a little commentary with each picture. Click any image to get the large version (2048×1536.)


The crowd gathers for the ceremony
The crowd gathers at Devil's Slide Tunnel and Bridge project


CalTrans Director Will Kempton speaks
CalTrans Director Will Kempton speaks at Devil's Slide Tunnel and Bridge project


Congressman Tom Lantos speaks
Congressman Tom Lantos speaks at Devil's Slide Tunnel and Bridge project


State Senator Leland Yee speaks
State Senator Leland Yee speaks at Devil's Slide Tunnel and Bridge project


San Mateo County Supervisor Rich Gordon speaks
San Mateo County Supervisor Rich Gordon speaks at Devil's Slide Tunnel and Bridge project


Preparing to dig
Preparing to dig at Devil's Slide Tunnel and Bridge project


Digging!
First digging at Devil's Slide Tunnel and Bridge project


Close up of “first dirt” post digging
First dirt at Devil's Slide Tunnel and Bridge project


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