Oahu residents braced for impact Friday as torrential rains triggered widespread flooding, prompting evacuation orders for more than 5,500 people and raising fears of a catastrophic dam failure. Emergency sirens wailed along the island’s North Shore, a region famed for its surfing, as floodwaters inundated streets, swept away vehicles and compromised homes. The immediate concern centers on the Wahiawa Dam, a 120-year-old structure officials say is at “risk of imminent failure.”
The unfolding crisis comes as Hawaii continues to grapple with the lingering trauma of the 2023 Lahaina wildfire, a disaster that underscored the vulnerability of the islands to extreme weather events. This latest emergency is being described by state officials as the largest flood event in Hawaii in two decades, with potential economic consequences exceeding $1 billion.
Hawaii Governor Josh Green, speaking at a press conference Friday evening, confirmed there have been no reported fatalities or missing persons as of yet. However, he emphasized the severity of the situation, stating, “This is a particularly touch-and-go day.” Rescue efforts are ongoing, with Honolulu Mayor Rick Blangiardi reporting that 233 people have been successfully rescued. The operation has been complicated by civilian drone operators interfering with aerial assessments, according to Ian Scheuring, a spokesperson for Honolulu.
Evacuations and Rescue Operations
Evacuation orders are in effect for areas downstream of the Wahiawa Dam, and residents have been urged to seek higher ground. The Honolulu Fire Department and the Hawaii National Guard collaborated to airlift 72 children and adults from Our Lady of Kea’au, a spring break camp located on the west coast of Oahu. While the camp itself is situated on elevated terrain, authorities opted for proactive evacuation due to the potential for rapidly changing conditions, according to Kimberly R.Y. Vierra, a spokesperson for St. Francis Healthcare System of Hawai’i, which owns the retreat property. Floodwaters had cut off road access to the camp.
Beyond the immediate rescue operations, officials are working to assess the extent of the damage. Mayor Blangiardi acknowledged that dozens, if not hundreds, of homes have been damaged, but a comprehensive assessment is hampered by ongoing flooding. Several pet-friendly shelters have been opened at Waialua High and Intermediate, Wahiawā District Park, Nānākuli High and Intermediate, and Kahuku Elementary, according to Governor Green.
Dam Concerns and Historical Context
The Wahiawa Dam has long been identified as a vulnerable structure, and officials have been closely monitoring its water levels, particularly following heavy rainfall last week. While water levels receded after that earlier storm, the current conditions are raising renewed concerns. “The water is actively running over the spillway right now,” said Waialua resident Kathleen Pahinui, who is preparing to evacuate to a friend’s home.
Hawaii regulates 132 dams, many of which were originally constructed to support the state’s now-declining sugar cane industry, according to a 2019 infrastructure report by the American Society of Civil Engineers. The state’s aging infrastructure has been a recurring concern, and the potential for dam failures has been highlighted by past incidents. In 2021, severe flooding may have caused a breach at the Kaupakalua Dam on Maui as previously reported. Further back, in 2006, seven people lost their lives when the Ka Loko dam on Kauai collapsed.
Broader Impacts and Ongoing Threats
The flooding isn’t limited to Oahu. On Maui, officials have issued evacuation advisories for portions of Lahaina, a community still reeling from the devastating wildfires of 2023, as nearby retention basins approach capacity. A flash flood watch remains in effect for most of the state, with Haleiwa and Waialua under a flash flood warning, according to the National Weather Service.
Governor Green warned that the economic impact of the flooding could exceed $1 billion, affecting both public and private sectors. He as well noted that this is the largest flood event Hawaii has experienced in 20 years. While officials express confidence in the overall stability of the island’s dams, the unpredictable nature of the ongoing rainfall presents a significant challenge.
Residents are urged to stay informed through official channels, including local news outlets and the Honolulu Department of Emergency Management. The situation remains fluid, and further updates will be provided as they develop into available.
If you or someone you know needs help, you can contact the Hawaii Disaster Relief Line at 1-800-RED-CROSS.
The Hawaii National Guard remains activated and will continue to assist with rescue and recovery efforts as the state braces for potentially more rainfall this weekend.
