Massive flooding in Hawaii threatens dam, forces evacuations as more rain looms

Officials in Hawaii ordered evacuations in flood-ravaged areas as the state grapples with its worst flooding in more than 20 years, with more rain expected to intensify the crisis.

Relentless downpours battered Oahu, where muddy waters submerged vast stretches of the North Shore, lifting homes and vehicles. Around 5,500 residents north of Honolulu were told to evacuate amid fears that the ageing Wahiawa Dam could fail, though the immediate threat later eased.

Widespread damage, mass rescues

More than 200 people have been rescued, with emergency crews conducting air and water searches for those stranded. While no deaths have been reported, authorities say the full scale of damage is still unclear.

On Maui, evacuation advisories were upgraded in parts of Lahaina as water levels in retention basins surged, raising fresh concerns in an area still recovering from the 2023 wildfire.

Warning remains in place

Even as floodwaters receded in some areas, officials warned the danger is far from over due to saturated ground and incoming rain. “Don’t let your guard down,” a National Weather Service meteorologist cautioned, noting that even light showers could trigger renewed flooding.

Billion-dollar impact feared

Governor Josh Green said damages could exceed $1 billion, affecting key infrastructure including roads, schools, airports and healthcare facilities.

Parts of Oahu recorded up to 12 inches of rain in a short span, overwhelming drainage systems and worsening the disaster.

Dam under watch

Authorities continue to monitor the Wahiawa Dam, a 120-year-old structure classified as high-risk. Fluctuating water levels have kept concerns alive, even as conditions briefly improved.

Crisis ongoing

The flooding has been linked to “Kona low” storm systems, known for bringing moisture-heavy winds. Experts warn that climate change is making such extreme rainfall events more frequent and intense. With more rain forecast, officials say the situation remains volatile and residents should remain alert.