The Devil’s Slide Tunnels south of Pacifica and north of Half Moon Bay are finally opening after decades of environmental battles and years of construction.

The tunnels are meant to solve the safety and erosion problems that have plagued that notorious stretch of Highway 1 since it was built.


The new tunnel consists of two bores each about 4,200 feet long and each with one lane and wide shoulder. The cutting edge tunnels have been a major engineering project and will feature jet-powered exhaust fans and carbon monoxide sensors.


A couple hundred people turned out for today’s ribbon cutting ceremony including Congresswoman Jackie Speier and the wife and daughter of the late Congressman, Tom Lantos whose lobbying efforts help lead to the construction of the new tunnels. Also present at the opening ceremony was the Half Moon Bay High School marching band and a number of environmental activists who pushed for the tunnels.


Environmentalists who had agitated for the tunnels, instead of a highway bypass, are known as “tunnelistas.” Among them was Ann Forrister, who was there under an alias, “My name is Captain Tunnel, and I am wearing red tights, black shorts, a red cape, tunnel vision glasses, a red hat. I’m celebrating the tunnel”



A parade of antique cars were the first vehicles to drive through the new tunnel.




Pacifica resident Mike Mooney holds a picture of himself next to a stretch of Devil’s Slide during one of the more memorable highway closures.


Two new bridges connect Highway 1 to the tunnels and bypass red-legged frog habitat in the valley below.


The 439-million dollar tunnels are the first to open in California in nearly fifty years and are the longest tunnels in the state. CalTrans plans to open the tunnels to traffic tomorrow morning.

As for the old stretch of highway with breathtaking views? It will soon open to hikers and cyclists.


This video shows a CalTrans bus carrying select members of the public and media driving through the west tunnel. The footage is sped up and does not show the entire length of the tunnel; it focuses on the entrance and exit.

Andrea Kissack contributed to this report. Photos and video by Jenny Oh.

At Last: Devil’s Slide Tunnels Open 29 April,2013Molly Samuel
  • It’s a shame you didn’t mention both bands that performed. Terra Nova High School band from Pacifica was in the lead with their black and gold uniforms.

  • Audrey

    I drove that stretch of highway this morning around 4am on my way to SF airport to fly home to Canada. I was reflecting as I was driving it that I would be one of the last people to drive that road. Very beautiful.

  • Snake River Guy

    Wonderful, fabulous tunnels – something to be really proud of. Too bad it took over 30 years of political wrangling for them to become a reality.

  • saimin

    Is this now a safe route for bicycling between Pacifica and Half Moon Bay?

    • Ari

      I’d say it improves things a lot, but there are still some curvy and narrow sections to get through from the tunnel to Montara

  • dcmlaw

    Will bikes be able to use both the tunnel and the old road? Thanks.

  • CoastsideLocal

    Love the shirts from your picture, and found them online. Local Montara business!

  • Todd

    Who writes this nonsense? “The 439-million dollar tunnels are the first to open in California in
    nearly fifty years and are the longest tunnels in the state. CalTrans
    plans to open the tunnels to traffic tomorrow morning.” No they are not the longest tunnels in the state. The Wawona Tunnel that provides access to the Yosemite Valley in Yosemite National Park is still the longest at 4,233 feet compared to the Devil’s Slide Tunnels at 4,149 ft (northbound) and 4,008 ft (southbound). Someone can’t do simple arithmetic, apparently.

    • Steve

      Geez, Todd lighten up. Only 100 feet off. We are just happy to finally have it finished!

  • Luis

    Todd is right.Even if off by only 100 feet, that distance is the difference between an accurate report and a mistake.

    But the woman in red with yellow mask she looks rediculous! Why make so much out of a pair of tunnels? It is stupid!


Molly Samuel

Molly Samuel joined KQED as an intern in 2007, and since then has worked here as a reporter, producer, director and blogger. Before becoming KQED Science’s Multimedia Producer, she was a producer for Climate Watch. Molly has also reported for NPR, KALW and High Country News, and has produced audio stories for The Encyclopedia of Life and the Oakland Museum of California. She was a fellow with the Middlebury Fellowships in Environmental Journalism and a journalist-in-residence at the National Evolutionary Synthesis Center. Molly has a degree in Ancient Greek from Oberlin College and is a co-founder of the record label True Panther Sounds.

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