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Oahu Orders Mass Evacuations as Wahiawa Dam Poses Imminent Failure Risk

A second Kona low on saturated ground triggered a rare flash flood emergency, cutting access to North Shore communities.

Floodwaters in Waialua, Hawaii, on Friday morning, March 20, 2026.
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Floodwater engulfs homes along the streets of Haleiwa, Hawaii, on Friday after days of rain pounded the island, forcing evacuations and cutting power. 
Debris from a storm-damaged house sits against a bridge along Kaukonahua Stream, caused by flooding from severe rains in Waialua, Hawaii, Friday, March 20, 2026. (AP Photo/Mengshin Lin)

Overview

  • Officials warned the Wahiawa Dam may collapse at any time, prompting “LEAVE NOW” orders for downstream areas that cover roughly 4,000 to 5,500 residents in Waialua, Haleiwa and nearby neighborhoods.
  • The National Weather Service issued a flash flood emergency for northern Oahu, with 6 to 12 inches of rain in 24 hours and additional rainfall forecast through the weekend under a continuing flood watch.
  • More than 200 people have been rescued, including 72 airlifted from a youth camp, and at least 10 people were hospitalized for hypothermia; authorities reported no fatalities.
  • Reservoir levels peaked just over 85 feet Friday before easing slightly, while roads were submerged or at risk of failure and targeted power shutoffs left thousands without electricity to reduce hazards.
  • The 120-year-old earthen dam, long rated high hazard with a state acquisition and spillway repairs pending, remains under close monitoring as officials assess widespread damage that Gov. Josh Green says could exceed $1 billion.