Linking Corte Madera & Mill Valley

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.

Sign Our Petition

Two Friends of Alto Tunnel leaders have challenged our supporters to match them up to $10,000 for the next phase of our campaign! Your gift will directly support grassroot efforts to deliver our call to action to our elected officials and the general public.