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Caltrans outlines five-year plan for Ferguson rock shed to restore SR-140
Summary
Caltrans engineers presented an updated design and schedule for a segmentally launched rock shed to permanently reopen State Route 140 through the Merced River Canyon. The agency said construction could take about five years and will require major materials, special heavy-moving equipment and state funding approval this spring.
Caltrans on Tuesday told the Mariposa County Board of Supervisors it plans to build a segmentally launched rock shed to restore full access to State Route 140 after the 2006 rockslide that buried the highway.
The rock shed will be anchored into the mountainside and assembled from precast concrete ‘‘boxes’’ that will be jacked into place. ‘‘The purpose of our project is to restore full access to State Route 140,’’ Caltrans project manager Corey Casey told the board, adding the structure must be anchored with multiple high-capacity rock anchors because of ongoing slope movement.
The agency abandoned earlier bridge and tunnel concepts after environmental review and geological study. A tunnel option would have required a 1.2-mile bore with complex ventilation and safety systems and would likely…
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