Manhattan’s flood walls are almost done. What will Mamdani do next?

More than a decade after Superstorm Sandy sent nearly 14 feet of storm surge into New York Harbor, the city's billion-dollar flood defense effort — elevated parks, rolling flood gates, rebuilt beaches — is nearly finished, with gates operational by the 2027 hurricane season. Mayor Zohran Mamdani has expanded the Bureau of Coastal Resilience by nearly 70 staff to maintain the new system, according to DEP commissioner Lisa Garcia.

The harder problem is what comes next: the city cannot protect all 520 miles of coastline, and must choose among marsh restoration in Queens, a bulkhead in Brooklyn, or a park in Harlem. Coney Island, hit hard by Sandy, still has no new flood defenses and floods routinely enough to block children from walking to school, says local advocate Pamela Pettyjohn.

New York's Department of Environmental Protection plans to begin a master resilience plan next year, aiming to finish by 2031. Other cities like Norfolk, Virginia have made the politically fraught choice to skip protecting lower-value flood zones, a path that has drawn backlash elsewhere when attempted.

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