Coastal Erosion & SR-1 Vulnerability — California's Most At-Risk Highway
active• halfmoonbay
Half Moon Bay's relationship with the Pacific Ocean is existential — and Highway 1, the community's only coastal artery, is increasingly vulnerable to the same forces eating away at Pacifica's cliffs to the north. Caltrans is managing multiple active projects on the San Mateo County coastside to address wave action, bluff erosion, and stormwater damage on SR-1 — the sole road connecting Half Moon Bay to Pacifica, Daly City, and the northern Peninsula. Winter storms in 2023 and 2024 caused significant road damage that took months to repair, and the risk of a prolonged closure grows with each major storm season. The city's Local Coastal Program update — required as part of Housing Element compliance — will also need to grapple with the long-term feasibility of coastal development as sea level rise projections worsen. For a city that depends on SR-1 for every emergency vehicle response, every supply delivery, and every tourist visit, highway resilience is not an infrastructure issue — it is a survival issue.
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Related cause: Traffic / congestion
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