The Alto Tunnel Study is an effort to gather information to determine whether it is feasible to reconstruct the Alto Tunnel for future use by bicyclists and pedestrians. The County is the lead agency in partnership with and cooperation with the Town of Corte Madera and the City of Mill Valley. To learn more about the study, click here.
On September 27th, a community meeting was held at the Corte Madera Community Center to discuss what was found inside the tunnel and the updated cost estimates. To view a video recording of that meeting, please click on the YouTube embedded video below.
The video will remain on the Community Media Center of Marin (CMCM) Youtube page. CMCM serves Marin County with community, educational and governmental cable channels via Marin TV. Click here to go directly to their page.
NEW!!! Alto Tunnel Investigation and Cost Estimate Update - 2018
The Alto Tunnel Study collected information requested by policy makers and the community to help make an informed decision about whether to reconstruct the tunnel for potential future bicycle and pedestrian use, or if there is a need to fill and permanently close it at some future point. The final report for the Alto Tunnel Study has been issued on the investigation of the interior reaches of the tunnel and the revised cost estimates.
The final report, appendices, and public comments received to date have been posted to the WalkBikeMarin website or you can view them by clicking the links below. As always, you can find background documents on that page as well as on the 2010 Mill Valley to Corte Madera Corridor Study webpage here.