Devil's Slide Tunnels Project
March 25, 2013 UPDATE:
Following many years of public input and careful evaluation of alternatives, Devil's Slide will be by-passed by two inland tunnels, providing a safe, dependable highway between Pacifica and Montara. This is the Devil's Slide Tunnels Project.
The project calls for construction of two tunnels beneath San Pedro Mountain, each 30-feet wide and 4,200-feet long. At the northern end, a 1,000-feet bridge will span the valley at Shamrock Ranch. A re-alignment of Route 1 at the southern end will provide safe transition into and out of the tunnel. Approximately one-quarter mile south of the tunnel is the site of an Operations and Maintenance facility. An earthen embankment and vegetation-covered roof will help the facility blend with natural surroundings.
Throughout the public input and evaluation phases, lasting over 30 years, concerns about effects on wetlands, wildlife, plants, noise, and visual impacts received highest priority – click on the links, above right, to see more information.
The bypassed section of Route 1, together with 70 acres of State right of way, will be available for public access and recreational use following the planned tunnel opening in early 2012. Caltrans will monitor and improve the state of wetlands, wildlife, and plants until independent resource and regulatory agencies determine mitigation work has met its success criteria.
Metropolitan Transportation Commission • 101 Eighth Street, Oakland, California 94607
This page was last modified Monday March 25, 2013
© 2013 MTC