Dangerous Flooding Prompts Evacuations on Hawaii's Oahu Island

Warning of Possible Dam Collapse as Heavy Rains Pummel the Region

Mar. 21, 2026 at 2:42am

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Dangerous flooding is impacting Hawaii's Oahu island, prompting evacuations and a warning from local officials of a possible dam collapse, as major rains pummel the area for the second significant rain event in a week. An evacuation order was issued for Haleiwa and Waialua, including areas near the Wahiawa Dam, which officials say 'may collapse or breach at any time'.

Why it matters

The flooding and potential dam failure pose a serious threat to public safety, with the possibility of 'life-threatening flooding and catastrophic amounts of fast-moving water in downstream areas.' This event comes just a week after a previous damaging flood, highlighting the increasing frequency and severity of extreme weather events in Hawaii.

The details

The National Weather Service in Honolulu has issued a flash flood warning after dam failure on the Kaukonahua Stream below Wahiawa Dam. Oahu Emergency Management warned that the dam 'has not failed but is at imminent risk of failure.' A flash flood emergency was also issued for northern Oahu earlier Friday for 'catastrophic' flooding, with floodwaters cutting off road access in and out of Haleiwa and widespread flooding of roadways and low-lying areas.

  • The evacuation order was issued early Friday morning local time.
  • The dam 'may collapse or breach at any time,' according to Oahu Emergency Management.

The players

Oahu Emergency Management

The agency that issued the evacuation order and warning about the potential dam collapse.

Josh Green

The Governor of Hawaii, who said the Hawaii National Guard has been activated and other resources are being deployed across Oahu amid the 'severe storm'.

National Weather Service in Honolulu

The agency that issued the flash flood warning and emergency for northern Oahu.

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What they’re saying

“Potential for life-threatening flooding and catastrophic amounts of fast-moving water in downstream areas.”

— Oahu Emergency Management

“We are coordinating closely with state and county partners to support evacuations, open shelters, and keep our communities safe.”

— Josh Green, Governor of Hawaii

What’s next

The judge in the case will decide on Tuesday whether or not to allow Walker Reed Quinn out on bail.

The takeaway

This event highlights the increasing threat of extreme weather events in Hawaii, and the need for robust emergency response and disaster preparedness measures to protect vulnerable communities from the impacts of flooding and potential dam failures.