Re-open Alto Tunnel!
Friends of the Alto Tunnel are dedicated to seeing the reopening of the tunnel, providing people of all ages and abilities a safe, easily accessible, car-free way to walk and bike between central and southern Marin and beyond. We believe that Marin needs to provide more ways for people of all ages and abilities to get around without the use of a car, improving air quality and traffic for all. 

Fill out the form below to petition the Marin County Board of Supervisors to continue the work on the tunnel and seek funding for the next step of the project. 

Additionally, if you want to be notified of volunteer opportunities, enter your email below.
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I support the reopening of Alto Tunnel for pedestrian and bicycle access.  *
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We're looking for people to join our team! If you believe in the vision for a safe, flat, and car-free route linking Corte Madera and Mill Valley, please consider getting involved today.

Whether you're able to commit to 2 hours a week or just interested in responding to action alerts, we would love your help!

Friends of Alto Tunnel is a volunteer-led community group working to reopen Alto Tunnel to provide people of all ages and abilities the freedom to choose a safe, car-free way to walk and bike between northern and southern Marin.
If you have any questions, please email
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