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Caltrans: Topanga Canyon Boulevard slide remains active; top‑down grading and drainage planned, opening likely by fall
Summary
Caltrans geotechnical chief told Topanga residents the landslide blocking Topanga Canyon Boulevard remains active and that mitigation will likely require removal of roughly 90,000 cubic yards of material and drainage work; officials said a cautious reopening by fall is a target but safety and environmental permits will govern timing.
Caltrans officials told the Topanga Town Council on Thursday that the landslide that closed Topanga Canyon Boulevard is still active and will require significant engineering work before the road can be reopened.
Nina Choi, Caltrans Geotechnical Services chief, said geologists have documented ongoing movement and groundwater at the site and are watching for changes in vegetation, cracks and landmark movement. "The slide is still active," Choi said. She explained that what is visible from the roadway is only a small portion of the sliding mass and likened the condition to an iceberg, with much of the instability below the surface.
Caltrans has preliminari…
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