Aging Wahiawa Dam Spurs Oahu Evacuations Amid Life‑Threatening Flooding
Honolulu officials warned that the 120‑year‑old Wahiawa Dam was at risk of imminent failure and issued a 5:35 a.m. emergency alert ordering more than 4,000 downstream residents to evacuate as water ran over the spillway. Firefighters and lifeguards on jet skis searched floodwaters amid reports of homes swept away, and about 185 people and 50 pets sheltering at Waialua High and Intermediate School were bussed to another center after that shelter flooded following 8–12 inches of overnight rain, with the National Weather Service warning of widespread life‑threatening flash flooding in Haleiwa and Waialua.
📌 Key Facts
- Honolulu officials issued a 5:35 a.m. emergency alert telling residents downstream of the 120-year-old Wahiawa Dam to evacuate because it was 'at risk of imminent failure.'
- The evacuation order covers more than 4,000 people; officials confirmed water was actively running over the dam's spillway.
- Firefighters and lifeguards on jet skis are searching floodwaters for stranded people, and there are reports of homes being swept away though totals are not yet known.
- About 185 people and 50 pets sheltering at Waialua High and Intermediate School had to be evacuated and bussed to another center after that shelter flooded.
- Officials reported 8–12 inches of rain overnight in parts of north Oahu on top of catastrophic flooding from last week; the National Weather Service warned of 'widespread life‑threatening flash flooding,' particularly in Haleiwa and Waialua.
📊 Relevant Data
As of the end of Fiscal Year 2025, 94 out of 123 regulated dams in Hawaii are in poor or unsatisfactory condition, representing approximately 76% of the total.
Report to the Thirty-Third Legislature — Hawaii Department of Land and Natural Resources
115 out of 123 regulated dams in Hawaii are classified as high-hazard, meaning their failure could likely cause loss of human life or significant property damage.
Report to the Thirty-Third Legislature — Hawaii Department of Land and Natural Resources
The average age of regulated dams in Hawaii is 91 years, with many built before modern safety standards and not meeting current requirements for impounding water.
Report to the Thirty-Third Legislature — Hawaii Department of Land and Natural Resources
Climate change is contributing to more intense rainfall events in Hawaii, despite an overall decline in rainfall, increasing the frequency and severity of flooding.
Less & Heavy Rain - Climate Change Portal — State of Hawaii
Native Hawaiian communities in Hawaii are disproportionately affected by climate change hazards, including flooding, due to limited resources for recovery; Native Hawaiians make up about 10% of the state's population but face higher vulnerability.
Spotlights - Climate Change Portal — State of Hawaii
📰 Source Timeline (2)
Follow how coverage of this story developed over time
- Honolulu officials issued a specific 5:35 a.m. emergency alert Friday telling residents downstream of Wahiawa Dam to evacuate because it was 'at risk of imminent failure.'
- Honolulu Department of Emergency Management spokesperson Molly Pierce said the evacuation order covers more than 4,000 people and confirmed that 'water is actively running over the spillway right now.'
- City spokesperson Ian Scheuring said firefighters and lifeguards on jet skis are searching floodwaters for stranded people and that there are reports of homes being swept away, though the total is not yet known.
- Roughly 185 people and 50 pets sheltering at Waialua High and Intermediate School had to be evacuated and bussed to another center because that shelter itself flooded.
- Officials reported 8 to 12 inches of rain overnight in parts of north Oahu, on top of catastrophic flooding from last week’s storm, with the National Weather Service warning of 'widespread life-threatening flash flooding' particularly in Haleiwa and Waialua.