California beach town confronts accelerating coastal erosion
San Clemente’s beaches, central to its identity and economy since the rise of its surf culture in the 1950s, are shrinking as powerful Pacific storms strip away sand. The erosion has reached the coastal railway, where waves and high tides forced repeated closures in September. After nearly a century of reliable service, the line—America’s second-busiest passenger route and a corridor carrying $1bn in annual freight—has closed seven times since 2021; disruption over the past five years has totalled more than a year.
Scientists warn that a developing Super El Niño, combined with a surge of warm water known as a Kelvin wave, could produce exceptional erosion. A 2023 projection found that climate-driven sea-level rise could eliminate 25% to 75% of California’s beaches by 2100, threatening homes, infrastructure and tourism well beyond San Clemente.
The crisis is also exposing how engineered these beaches are. San Clemente received about 2m cubic yards of sand from construction of Dana Point harbor in the late 1960s, while dams and coastal development have since restricted the sediment that naturally replenishes the shore. Local activist Cameron Cosgrove says the city now lacks 4m to 6m cubic yards and has proposed a November ballot measure for a voluntary 1% sales tax to fund beach restoration and wildfire prevention. The decisions carry added urgency before Lower Trestles hosts Olympic surfing in 2028.
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