Join MCBC and the Friends of Alto Tunnel for a campaign reboot to reopen the Alto Tunnel. While important steps were taken during the 2010s, progress stalled. Marin’s elected officials have felt more pressure from influential opponents of the tunnel than its supporters. It’s time to change that.
At our campaign reboot on April 8th, we brought people up to speed, explained what has been done and what still needs to happen. We also outlined opportunities on how to get involved! We also hosted a virtual Q&A on April 26. If you weren’t able to attend either event, you can find the Zoom recording of the virtual Q&A here.
Looking For Ways To get involved?
The Friends of Alto Tunnel is welcoming new members! We meet once a month on Zoom. If you’re interested, join one of the monthly meetings with no commitment required. Click here for details about the Reopen Alto Tunnel Local Team.
Please take 30 seconds to fill out the Alto Tunnel petition, asking our elected leaders to take the next steps to open the tunnel.
You can also sign up to volunteer for specific tasks. Every action helps move this project forward, choose the ways that work best for you:
Thank you for your interest in this important project. We hope to see you soon!
A Brief History of the Tunnel
The single most transformative project in Marin County would be the reopening of the Alto Tunnel to bicycle and pedestrian travel. The tunnel was dug through the ridge between Mill Valley and Corte Madera by the Northwestern Pacific Railroad in 1884. It was then boarded up in 1975. But since the 90s, advocates have pushed to repurpose the Alto Tunnel. Other tunnels similar to it have also been considered for active transportation use, allowing people to bypass hills and avoid busy roads.
The opening of the Cal Park Hill Tunnel, just two miles north of the Alto Tunnel, in 2010 marked a huge win. It showed that the rail infrastructure of the 1800s could become the bike infrastructure of the 2000s. Today, that tunnel is used by hundreds, sometimes thousands, of people a day. Its opening has led to cutting off several miles and many minutes of travel for people traveling outside of a car.
The Alto Tunnel would open a level route separate from cars between Central and Southern Marin, saving people traveling by bike many minutes, creating an ADA-compliant route for pedestrians, and taking thousands of cars off the road as people shift their short trips to other modes.
For more information about the studies done up to this point, please visit the Friends of Alto Tunnel website at OpenAltoTunnel.org.
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