Hawaii Faces Catastrophic Flooding, Potential Dam Failure

Got story updates? Submit your updates here. ›

Hawaii has suffered its worst flooding in more than 20 years, with heavy rains inundating the state and causing widespread damage. Gov. Josh Green said the cost of the storm could top $1 billion, including damage to airports, schools, roads, homes, and a Maui hospital. Authorities have warned that a 120-year-old dam in Wahiawa could fail, prompting evacuation orders for 5,500 people. No deaths have been reported, but about 10 people were taken to the hospital with hypothermia. The flooding has been described as "catastrophic" by officials, with dozens, if not hundreds, of homes damaged. More rain is expected in the coming days, raising concerns about the dam's stability.

Why it matters

The severe flooding in Hawaii highlights the increasing intensity and frequency of extreme weather events driven by climate change. The state's aging infrastructure, including the vulnerable Wahiawa dam, is being put to the test, raising concerns about public safety and the long-term resilience of Hawaii's communities. This event underscores the need for proactive investment in disaster preparedness and climate adaptation measures.

The details

The flooding was triggered by heavy rains that fell on soil already saturated by downpours from a winter storm a week ago. Muddy floodwaters have smothered vast stretches of Oahu's North Shore, lifting homes and cars and prompting evacuation orders. Authorities are closely monitoring the Wahiawa dam, which has been deemed "at risk of imminent failure" and could result in the loss of human life if it breaches. The state has been working to acquire the dam and make necessary repairs, but the transfer has not been completed.

• The flooding began on March 21, 2026, with heavy rains overnight.
• Parts of Oahu received 8 to 12 inches of rain, with the island's highest peak, Kaala, getting nearly 16 inches in the past day.
• More rain, up to 6 to 8 inches, is forecast for the next two to three days.

What they’re saying

What’s next

A state board is due to vote on the acquisition of the Wahiawa dam next week, which could pave the way for necessary repairs to the aging infrastructure and improve the state's resilience to future extreme weather events.