California's coastal bluffs and beaches, while seemingly rugged, can be surprisingly fragile when confronted by a powerful El Niño. This vulnerability was dramatically evident during the 1982–83 winter, one of the most destructive El Niño events in state history, which inflicted hundreds of millions of dollars in damages.
That winter, fierce storms battered the coastline with immense waves and heavy rains, exacerbated by elevated sea levels and high astronomical tides. In Orange County, large sections of the Huntington Beach Pier were torn off, and the Seal Beach and San Clemente piers sustained damage. Across the wider Southern California region, this period saw the destruction of one-third of the Santa Monica Pier, damage to the Malibu Pier, the tearing apart of numerous seawalls, decks, and stairways, and the complete destruction of 33 oceanfront homes. Furthermore, millions of cubic yards of sand were stripped from Southern California beaches, and sections of the Pacific Coast Highway experienced severe flooding, mudslides, and washouts.
The economic toll was substantial, with an estimated $328 million (in 2025 dollars) in damage to oceanfront property, $87 million in losses to recreational facilities like piers and parking lots, and $66 million in damage to large engineering structures such as breakwaters and jetties. The 1982-83 El Niño temporarily altered public perceptions of coastal property security, leading to tightened building restrictions, increased insurance rates, and a surge in requests for seawall permits. However, the source indicates that in subsequent years, "it was back to business as usual," with new arrivals continuing to purchase oceanfront homes previously damaged.
El Niño is a natural climate pattern that causes shifts in weather globally. Along the U.S. Pacific Coast, it typically brings powerful atmospheric river storms and heavy downpours. A key impact is the elevation of sea levels along the Pacific Coast for weeks at a time as warmer seawater expands. During the 1982–83 event, sea levels were elevated by about a foot in San Diego and nearly two feet in San Francisco. These higher sea levels enable storm waves to break closer to shore, intensifying erosion of beaches and bluffs, and leading to the destruction of both private oceanfront development and public infrastructure, including streets, highways, bridges, piers, parks, and recreational facilities.
Much of California's coastal development, including homes on beaches, bluffs, and dunes, occurred from the late 1940s to the late 1970s during a period of population growth and generally mild coastal storm climate, without significant concern for future hazards or sea-level rise. While increased coastal armoring helped limit erosion during very large El Niños in 1997–98 and 2015–16, the winter of 2022–23 saw conditions almost identical to early 1983, resulting in an estimated $4.7 billion in economic losses along California's coast from high seas and waves alone.
Now, an El Niño building in 2026–27 is forecast to be even stronger than the 1982–83 event, with coastal homes already experiencing damage. An expert who has studied coastal geology and oceanography in California for nearly six decades suggests that coastal flooding, erosion, and landslides are likely, and dramatic cliff collapses would not be a surprise. California's latest climate assessment, released in October 2026, warns of more intense storms and increased erosion as temperatures and sea levels continue to rise. The southern end of the state is already experiencing wave damage from an exceptionally busy Pacific hurricane season, fueled by El Niño, with stripped beaches and destroyed homes reported near San Diego. The state's storm season typically begins in October or November.
The magnitude of this emerging El Niño, likely to be one of the strongest on record, underscores the urgent need for coastal communities to adapt to a very different future. While many communities are preparing with sandbags, clearing culverts, and evacuation plans, there are limits to what can be done to halt erosion. Building seawalls and rock revetments can offer some protection if designed effectively, but they can also contribute to the loss of beaches over time as sea levels continue to rise. Replenishing beaches with sand is costly and often provides only short-lived benefits. Extensive shoreline development, eroding bluffs, aging infrastructure, and increasing exposure to extreme weather are placing considerable pressure on coastal communities. Some areas may eventually face the difficult transition from continued shoreline protection to a planned retreat from the coast, or retreat following repeated damage. There is little that any developed coastal area can do at this point to minimize the immediate impacts of the El Niño underway, but preparing to manage risks and adapting to changing future conditions is crucial for homeowners, businesses, and communities.
