Hawaii's 90-Foot Hōlei Sea Arch, About 550 Years Old, Collapsed Into the Pacific During Storm Nolo

The park explained the formation's fate by differential erosion, where softer rock wears away faster than the harder rock around it. Put simply, the arch had a lifespan, and the sea was always going to set the end date.

A warning for visitors

With the arch gone, the park service has a safety problem of its own. It said people have been entering closed areas to look at what is left, as seen on social media, and warned that the cliffs drop vertically into the ocean and can collapse without warning. In the park's words: "Visitors are urged to stay back from the unstable coastal cliff edges which drop off vertically into the ocean and present a serious falling hazard." Rangers say anyone who gets too close puts themselves and first responders at great risk of falling and drowning off the rough coast.

What visitors can still do

Chain of Craters Road is a scenic drive down the flank of the volcano to the sea, and the coast beyond is still dramatic, with sea cliffs and lava fields. The park's instruction is simple: stay out of closed areas and away from the edges. What has changed is the postcard. For visitors who have seen the arch in photographs for years, the shot they planned is no longer there.

The loss is also a reminder of how quickly Hawaii's coast is changing. Landmarks that look permanent in a photograph are, on a geological clock, temporary, and this one has made that point in a single storm.