Caltrans Celebrates the Devil�s Slide Tunnel �Punch Through�
Caltrans last week celebrated the �punch-through� of the north portal of the Devil�s Slide Tunnel on State Route 1 (SR-1) in San Mateo County. To the cheers of the assembled crowd, crews operating the massive excavator bored through the barrier � a retaining wall on the northern end of the tunnel.
Caltrans broke ground on the tunnels on Sept. 17, 2007. The tunnels will replace a stretch of SR-1 known as �Devil�s Slide� that was subject to numerous rockslides and slip-outs. At times, the highway was subject to long-term road closures due to extensive weather damage.