Raging Floodwaters Hit Oahu, Rescuers Pull 230 People to Safety

Raging floodwaters swept homes off their foundations, submerged cars, and trapped hundreds of residents across Oahu's North Shore last weekend, forcing emergency crews to pull more than 230 people to safety in what officials described as the worst flooding the island had seen in roughly 20 years.

Honolulu Mayor Rick Blangiardi confirmed the rescue figure at a Friday news conference, urging residents to "take the storm as seriously as you can." He estimated the damage could exceed $1 billion, citing destruction to roads, schools, airports, and a major hospital on Maui.

The crisis deepened when officials warned that the Wahiawa dam, a 120-year-old structure on Oahu, was at risk of catastrophic failure. Water levels at the dam climbed from 79 feet to 84 feet in less than 24 hours, just six feet short of its capacity. Ryan Wilson, a spokesperson for the Honolulu mayor's office, said authorities had no choice but to act. "This is one of those circumstances where you can't take a risk about it," he said. Evacuation orders went out to thousands of residents living downstream; Honolulu emergency management officials put the figure at more than 4,000 people, while some estimates reached 5,500. Those orders were later lifted after Oahu Emergency Management reported that dam water levels had begun trending downward.

The storm was the second severe weather event to strike the islands within a week, hitting saturated ground that had little capacity to absorb additional rainfall. Gov. Josh Green warned that some parts of the state had already received 40 to 50 inches of rain over the prior 10 days. "It will take much less rain to trigger flooding, road closures and damage," he said, adding a blunt directive to residents: "Don't take this storm lightly." Forecasters projected Oahu could receive an additional four to six inches of rain, with parts of Maui facing as much as 12 more inches.

The National Weather Service declared a flash flood emergency for northern Oahu, warning of "life-threatening flash flooding" across the region. The agency noted that "floodwaters have cut off road access in and out of Haleiwa, and widespread flooding of roadways and low-lying areas is ongoing." Emergency sirens blared along the North Shore as crews conducted rescues directly from rooftops and evacuated neighborhoods including Waialua, where floodwaters inundated residential streets.

Gov. Green confirmed the Hawaii National Guard had been activated to support response operations. About 10 people were hospitalized with hypothermia. No deaths had been reported as of the Friday briefings, though Green acknowledged that conditions remained dangerous and fluid.

The state also activated a displacement assistance program to help residents obtain discounted hotel rates while evacuation orders remained in effect.

The Wahiawa dam is among 132 dams the state regulates across Hawaii, many of which were built decades ago to support the sugar cane industry and have raised long-standing concerns among infrastructure engineers. Mayor Blangiardi's $1 billion damage estimate remains preliminary, and officials have not yet released a consolidated assessment of infrastructure losses statewide. Power outages affected thousands of residents across the island, though exact figures were still being compiled by utility crews working to restore service.