Key Takeaways

• The 90-foot tall lava rock structure has completely disappeared into the Pacific Ocean.
• The collapse likely occurred during Tropical Storm Nolo between September 23 and 27.
• Park officials warned in 2018 and 2021 that the formation was unstable and temporary.
• The arch was a popular tourist destination located at the end of Chain of Craters Road.

The historic Hōlei Sea Arch, a 90-foot-tall (27.4m) lava rock structure in Hawaii, has collapsed into the Pacific Ocean. This natural wonder, which formed approximately 550 years ago, is no longer visible, marking the end of an era for this geological landmark.

The National Park Service (NPS) confirmed that while the arch was still projecting into the water from the coast of Volcanoes National Park on September 23, it was completely gone by September 27. The exact time of the collapse remains unknown. However, officials believe the structure fell while the park was temporarily closed due to Tropical Storm Nolo last weekend. The arch was situated at the end of Chain of Craters Road on the island of Hawaii, also known as the big island, making it one of the most accessible and heavily photographed tourist destinations in the region.

The NPS stated that the coastline flanking the sea arch had shown signs of instability for years. The agency had previously warned in 2018 that earthquakes during the Kīlauea volcano eruption and summit collapse had damaged the cliffs near the arch. In January 2020, new cracks and instability in the cliffs led the park to close the original arch viewing area. A few months later, a new viewing area opened at a safer distance. Waves from a tropical storm later that year broke off a chunk of rock from the bottom of the arch, further signaling its precarious state.

Geological Context and Public Reaction

The disappearance of the arch has sparked widespread reaction online. Thousands of people have liked and commented on the NPS social media post about the arch's collapse, with many sharing their memories of visiting the site and posting photos of it. One Facebook user commented, "Nothing and no one is here forever. Millions of years from now the sun will die. Appreciate the good, the beauty, now." This sentiment reflects the broader understanding among visitors and officials alike that the formation was beautiful but temporary.

The park service has long acknowledged the transient nature of such geological features. In a 2021 statement, the NPS noted, "This formation is beautiful, but temporary, and has a limited life span. The sea arch will eventually crumble into the sea. However, others will replace it as the cliff slowly migrates inland." This prediction aligns with the natural process of coastal erosion, where sea arches are created by waves eroding weaker rock in a headland. Over time, the arch weakens and eventually collapses, leaving behind sea stacks or a straightened coastline.

The collapse of the Hōlei Sea Arch is not an isolated incident but part of the dynamic landscape of Hawaii's volcanoes. The region is geologically active, with ongoing volcanic activity and seismic events shaping the land. The 2018 eruption of Kīlauea was a significant event that contributed to the instability of the cliffs near the arch. The subsequent cracks and instability led to the closure of the original viewing area, prompting the park to prioritize visitor safety.

The loss of the Hōlei Sea Arch means that a significant portion of Hawaii's tourism landscape will change. The arch was a popular destination, drawing visitors from around the world to witness its unique formation. The closure of the viewing area and the eventual collapse of the arch highlight the challenges of managing natural resources in a changing environment. Park officials continue to monitor the coastline for further signs of instability and erosion.

The collapse serves as a reminder of the power of nature and the inevitability of change. While the Hōlei Sea Arch is gone, the landscape of Hawaii continues to evolve. New formations may emerge over time as the cliff slowly migrates inland. The park service encourages visitors to appreciate the beauty of the current landscape while being mindful of the natural processes that shape it.

Hawaii's Volcanic Coastline Evolution

The collapse of the Hōlei Sea Arch marks a significant moment in the geological history of Hawaii's coastline. While the specific arch is gone, the process of coastal erosion will continue to shape the landscape. Future visitors may see new formations emerge as the cliff slowly migrates inland. The park service will likely continue to monitor the area for safety and educational purposes, ensuring that the natural beauty of the region remains accessible and appreciated.