Caltran Bridges at Devil's Slide San Mateo County, California Creating a safer passage at Devil’s Slide • Segmental bridges were the best solution to the environmentally sensitive location • HNTB provided construction management for twin cantilever, cast-in-place segmental bridges When it rains, the rocky hills and cliffs that hold Highway 1 above the Pacific Ocean in San Mateo County start to slide. This project replaces the infamous coastal stretch of California’s State Highway 1, which hugged the coastline for much of the distance between the two towns and had a long history of extended closures, due to recurring rockslides. After years of studies, Caltrans decided to bypass the Devil’s Slide with two inland tunnels and a corresponding pair of cast- in-place, balanced cantilever

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